.A \EW LOW- \OISE TWIN TRIODE to improve performance and simplify the design of Audio Pre- Stages

Low noise, high performance, moderate cost - provided by the new RCA -6EU7, a high -mu, nine- pin miniature twin triode designed especially for high -gain, resistance- coupled, audio pre -amplifier stages -in (monaural or stereo), amplifier kits, tape recorders, juke boxes, and public address systems.

Noise and hum are minimized by the use of double - wound, helical heaters, and a new base layout which keeps heater leads well away from the grid leads. Low microphonism, high mechanical strength, and reli- ability are assured by a short, rugged cage which provides sturdy support for the tube electrodes. New base also simplifies stereo layouts. The accom- panying diagram shows how the basing arrangement facili- tates the design of an amplifier using the two triode units for isolated stereo channels. For technical information, contact the RCA Sales Repre- sentative at our office nearest you, or write directly to RCA Electron Tube Division, Commercial Engineering, Section H 91-DE. Harrison, New Jersey.

EAST: 744 Broad Street, Newark 2, N. J. HUmboldt 5-3900. MID-WEST: Suite 1154, Merchandise Mart Plaza, Chicago 54, III. WHitehall 4-2900. WEST: 6355 E. Washington Blvd., Los Angeles 22, Cal. RAymond 3 -8361.

The Most Trusted Name in Electronics RADIO CORPORATION OF AMERICA AUGUST, 1960 VOL. 44, No. 8

Successor to RADIO, Est. 1917. only for those who want the ultimate

"TOP RATED" AU D Io again and again ENGINEERING MUSIC SOUND REPRODUCTION -and NOW AGAIN! C. G. McProud, Editor and Publisher Henry A. Schober, Business Manager Janet M. Durgin, Production Manager °0.4 083®. Edgar E. Newman, Circulation Director _' - ,,,r,,,

Model S -5000. 20 +20 wett "slam" Dual Amplifier- Preamplifier. Fair Trade Price -5189.50

Sanford L. Cahn, Advertising Director MEMRgn Midwest Representative et - 1MANG W. A. Cook and Associates 230 East Ohio Street, Chicago 11, 111. Model 5.2200, FM -AM -MX Stereo tuner, tnn Fair Trade Peke -5119.50 ' West Coast Representative +s i: - eeeast lames C. Galloway y1NCea 6535 Wilshire Boulevard, Los Angeles 48, Calif. CONTENTS Audioclinic- Joseph Giovanelli 2 Letters 6 Light Listening- Chester Santon 8 Audio ETC- Edward Tatnall Canby 10 AMERICAN Editor's Review 16 AUDIO INSTITUTE Calibration -Dan Peters - 19 n LAS'IOh Sr r,n.Oa. N, 1.02 Cubic Feet and 45 cps. Richard Sequerra 20 Start with Mono-Build up to Stereo -C. F. Barton 22 BUYERS' GUIDE SECTION October n. 1959 Amplifiers and Preamplifiers 23 Tuners Sherwood Electronic labs.. Ina. 27 4300 North California ATORO. Chicago 18. Illinois and Enclosures 41 Record Changers 50 Gentlemen, Turntables We find that the incorporation 52 of a enter-channel output and Pickup Arms a damping factor selector to 56 July. 1959. increases the Phono Pickups 58 Summary Rating of the Sherwood Tape Recorders S -5000 to he highest of all 89 18 Stereo Amplifiers tested to Tape Accessories 92 the All Evaluation Test Report.. Sincerely. 92 Miscellaneous AMERICAN AUDIO INSTINTE Electronic 93 Organ Kit 95 Tape Guide - -Herman Burstein 28 Felts R Sr.., Record Revue- Edward Tatnall Canby 80 Executive Director and All That -Charles A. Robertson 66 The "Most honored of them all" About Music-Harold Lawrence 78 AUDIOMAN S -5000 stereo amplifier- preampli -. No. 11-Tames S. Swinehart 88 fier is Advertising Index 96 joined by the S-2200 stereo COVER PHOTO-Living room stereo demonstration in the display of British tuner. As with its "Top Rated" Industries Corporation at the recent British Exhibition U.S.A. during June. The predecessors, the S -2200 features visitor entered the complete display at the lower right comer of the photo, climbed FM "Interchannel Hush" plus push a few steps and proceeded along the raised passage seen at the left. While listening button selector, internal plug -in to properly reproduced stereo music from the equipment on display, he could ob- adaptor for Stereo FM Multiplex, serve a lucid description of each element of a home system as detailed on easy -to- 2 "Acro- beam" tuning indicators, read placards with suitable illustrations. As he passed out of the living -room simulcast FM /AM stereo. All area, he saw a display of the non -hi -fl products imported by British Industries Sherwood tuners feature Corporation. The equipment used in the display consisted FM sen- of a Garrard 88 sitivity below microvolts changer, Leak tuner and Leak amplifier installed in a River Edge chairside 0.95 and table, 1/2% distortion @ 100% with two Wharfedale speakers opposite. The entire display was designed by Rex FM. Frey of Lord & Taylor, New York. For further details write: Sherwood AUDIO (title registered U.S. Pat. O0.) is published monthly by Radio Electronic Laboratories, Inc., Magazines, Inc.. Henry A. Srhober, President; C. C. 4300 McProud, Secretary. Executive and Editorial Offices, 204 Front St., Mineola, N. Y. Subscription rates Possessions, Canada, and Mexico, - U. S. N. California Avenue, Chicago 18, $4.00 for one year, $7.00 for two years, all other countries, $5.00 per year Single Copley 504. Printed In U.S.A. at 10 McGovern Ave., Lancaster. Pa. All rights reserved. Entire contents copyrighted 1950 by Radio Illinois. Magazines. Inc. Second Class pottage paid at Lancaster, Pa. RADIO MAGAZINES, INC., P. O. Box 629, MINEOLA, N. Y. Postmaster: Send Form 3579 to AUDIO, P. O. Box 629, Mineola, N. Y. For Comprete epecITlcetlons write Dept. A -M. AUDIO AUGUST, 1960 1 for the finest in high fidelity kits

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Grounding a Home Music System 3. Since hum and its causes are some- times quite complicated, the problem of Q. (The following is a composite answer grounding any type of home music system ACRO'S PREAMPLIFIER to two letters written on two different to a waterpipe or radiator depends on the A new all feedback preamplifier with low dates by the same reader. Each of these amount of hum and upon the nature of the noise, 2 MV referred to phono input, high letters, of course, received a personal hum. If the system runs perfectly well, do gain, 60 DB phono and tape, and low distor- reply.) nothing at all about such grounding. I tion, 0.15% IM for 1.5V out. Extra features Letter 1 -I am putting my equipment cannot say just how far to go with ground- Include individual bass and treble controls, into a cabinet in which I will have to cut ing the entire system to waterpipes and rumble and filters, switch, third scratch phase several holes in the back for power leads, the like since sometimes this will aggravate channel output, light matrix, and exclusive audio leads, etc. To snake it neater, I have Mic. Dub switch. Supplied with two low noise a hum condition rather than relieve it. If 7199 pentode /triode, two 7247 dual triode taken a Bud Minibox and arranged it for any of the equipment you plan to use is tubes. $09.50 Factory Wired $114.50 several power outlets. I have also taken of the a.e: d.c. variety, do not ground it or another Bud Minibox and used other types any associated components to a radiator. of sockets for audio connnections and an- Failure to observe this precaution is almost tenna leads. My problem is that in using certain to cause a blown fuse and damage standard phono connectors I have used to your equipment. two wires, one from the center pin and one from the ground lug. Is there any danger of a ground loop because of the "Putter," Flutter and Tracking Force fact that the two phono connectors are connected on the ground side through the Q. My main problem is as follows: I metal box itself? have an odd difficulty in the turntable. Letter 2-I have now converted my sys- There are two objectionable sounds. One is tem to stereo. I would now like to know that it has apparently more flutter in pitch what is the proper and complete way to at the center of records, as compared to ACRO'S ULTRA LINEAR II AMPLIFIER ground the entire system and how it should the edge (this one really is strange, as This famous 60 watt basic amplifier has long be grounded to the 117 -volt outlet box or flutter should be uniform if the turntable been a favorite of discriminating . causes it) and it has an odd, "puttering" Acro perfected Ultra-Linear circuitry has been waterpipe ground. When lift the tonearm to place it on sound for a small part of a revolution on combined with a unique feedback system to I sounds as if it shakes the an record, get a hum until I remove my many records. It provide amplifier with unusually low dis- a I much tortion, superior feedback stability, and finest finger from the arm. Should the tonearm record a little. This "puttering" is transient performance. Construction time is be grounded to the turntable? Will this worse at a cold start, reducing to a much only two hours. Supplied with two EL -34 out- get rid of the hum which occurs when less noticeable amount after the motor put tubes, one 12AX7, one 12ÁU7, and GZ34 the tonearm is touched? warms up. It is much worse near the center rectifier.. $79.50 Factory Wired $109.50 I certainly would appreciate any help of the records. If one increases the stylus you can give me. I would like you to dis- force, the noise is suppressed. But I feel cuss this in your column some time, as I that it should not exist at all. imagine quite a few people would be inter- I will tell you what my investigation ested in this important part of a system. has shown: It is not caused by warped A. Hasek, Jr., Pittsburgh, Pa. records. I proved this by putting a large Charles the record, has been rubber band under one side of A. (1) After all your equipment and no effect in pitch, no change in "put- properly mounted in the cabinet, link all This nearly eliminated heavy bus wire, No. tering" took place. chassis together with cartridge and arm as suspects. Also I 12 or heavier. It should then be possible to my finger, and the Minibox and turned the turntable with mount all connectors to at no speed did this "puttering" occur (I use both terminals on the connectors with- couldn't tell about the flutter here.) Since out getting into complications with ground speed, will be I never use the 45 I interchanged ACRO'S STEREO 20.20 AMPLIFIER loops. By so doing, hum conditions idler wheels. This also had no effect and the shock hazard sometimes the A two channel stereo amplifier which provides minimized upon these two phenomena. The only things chassis are touched simul- a full 18 watts in each channel, or a total of present when two that I have not checked are the motor and 36 watts of low distortion stereo in your lis- taneously will be eliminated. idler rubber mounts. They may be too ofd. Distortion is only 1.5% IM at be that tening room. (2) In general, it Can stated see how a motor of itself could 18 watts per channel, 0.5% at 16 watts. Ex- be I cannot the turntable and tonearm should these defects, since it runs so fast. cellent square -wave and transient perform- grounded to the preamplifier which can be cause EL- output it runs at all, I should think that it rice. Supplied with four 84/6005 by means of a phono connector If tubes, two 12AX7 driver tubes. finest per- done would be satisfactory. into one of the unused inputs, and formance and lowest price for a dual amplifier. plugged The trouble with something of this sort x $69.50 Factory Wired $99.50 the ground from the arm and table taken enough to notice. If This will is that it is just bad to the skirt of the connector. something really went wrong, it could be write for infor mation to: eliminate the hum which occurs when the the seen and adjusted. ACRO PRODUCTS CO. tonearm is touched and will minimize Another, simpler question: How may one problem of static electricity. 410 Shurs lane, Phila. 28, Pa., Dept. AUD -8 know if he is using enough tracking force? I presently use 4 grants. Three grams Acro ... the first name in audio! e 5420 Newkirk Ave., Brooklyn 3, N. Y. AUDIO AUGUST, 1960 2 Progress Report #3 from Garrard Laboratories

THE FUTURE OF RECORD PLAYING HAS BEEN TURNING ON THIS MOTOR FOR THE PAST 8 MONTHS

It's true. Behind the locked doors of the Garrard laboratories, our engineers have been testing some significant new gramophone motors. Someday you can expect one of them to establish its own standard of quiet efficiency, just as the present Garrard motors are doing today. When it is finally released, it will reflect all the arduous months of creative engineering that went into it. Our designers developed it out of a 40 -year tradition of experimentation, the perfectionist tradition that has enabled Garrard to pro- duce and provide so many of the meaningful advances in the world' finest record playing equipment.

G firnest seemed to sound just as good except on very heavy organ passages. More force does not seem to improve anything. Some records sein to be over -recorded. Robert Tabony, Durham, N. C. A. Sometimes a phenomenon which Sonotone's 1960 sounds like "flutter or putter" is caused by the stylus being in poor contact with the census over disc. This, in turn, can be caused by a de- fective cartridge, too low a tracking force, a worn stylus, or a tracking error in the arm. i You have not necessarily eliminated tracking force as a factor. You stated that the condition disappears with increased tracking force. This could mean that, prior to the increased tracking force, the records were tracked too lightly. It could also mean that the cartridge is defective and hence requires a greater than normal tracking force for adequate sound reproduction. It may also mean that the stylus has worn and that it maintains adequate con- tact with the grooves only because of the added force. This will,, in addition, cause severe record wear. It could mean that the turntable is in- volved, though no "puttering" was beard when the turntable was spun with your (yes, 10 million) finger. This does not preclude the possi- bility that the turntable well is defective or is in need of cleaning and lubrication. Remember that the angle of force applied by your finger is not at all the angle of force applied by the motor and idler as- cartridges. sembly. This last consists, in addition to now in use! its rotational components, of a lateral component tending to push the turntable away from the idler. It is this lateral com- ponent which may show up the noise from the well assembly. The added tracking weight may exert a force on the turn- table in such a direction as to cancel some of this lateral component. You want to know how to determine correct tracking force. First you should use the cartridge manufacturer's recom- mendation as a guide. The tonearm with which the cartridge is used, however, will have some effect. When making the tests, be sure that the cartridge and stylus are in good condition. Play a record starting with the cartridge manufacturer's recommended force. Adjust tracking force above and below this value until the sound reproduc- tion is at its best. Use the minimum force which will bring about this result. When selecting a suitable test record, avoid one which is seriously over-recorded. Such a has is difficult and sometimes impossible Only a few years ago, Sonotone invented the ceramic cartridge...and record cleanly. And no wonder! Over the years, to track been setting sales records ever since. major problem, I tend it's Going back to the Sonotone has developed its fine cartridge line to the point where today to suspect tracking error or stylus wear possible the standard of the industry. Models available for virtually every type of in preference to some of the other listed earlier. Tracking error will equipment by over 70 manufacturers. In causes ...used as original cause the force applied to the needle to be fact, Sonotone has already sold over 10,000,000 cartridges. You'll hear the transmitted to the cartridge at such an not exert maximum force difference when you change to Sonotone ceramic or new crystal cartridges. angle that it will upon the cartridge elements. This is the same as saying that the compliance of the cartridge has been decreased which can cause distortion in various forms, in ad- dition to record wear. The stylus can influence the quality of reproduction. When a stylus wears, it makes SonotonELECTRONIC APPLICATIONS DIVISION, ELMSFORD, N. Y., DEPT. C26 -80. with more and more of the groove's contact IN CANADA, CONTACT ATLAS RADIO CORP.. LTD., TORONTO surface. This restricts the freedom of the LEADING MAKERS OF stylus to move. This will cause considerable record wear and can cause some very strange-sounding distortion, similar to that which you have described. This is especially true when the turntable has a slight verti- cal warping. Æ BATTERIES CARTRIDGES SPEAKERS TAPE HEADS MIKES ELECTRONIC TUBES AUDIO AUGUST, 1960 4 A TRIO OF TIMELY TRIUMPHS FROM

A. of Vienna, long acknowledged one of the world's top designers and builders of professional transducers, who now bring to the quality- conscious amateur recordist Earwitness, Fi- delity in two superb new mikes and a remarkable new headset, all priced far below the level of their performance.

NEW -D 11 N Dynamic Cardioid NEW -C 14 Condenser Omnidi- NEW -K 50 Dynamic , Mike for the professional- minded rectional Mike for the multitudes light as a feather and faithful as a amateur. Instant choice of high or who could not previously afford mirror, for mono and stereo realism low impedance for tube and tran- the. unique characteristics of this in a tight little world of your own, sistor circuits - just plug in and outstanding type of microphone. free of ambient aural interference record. Bass -attenuating switch Extraordinary smoothness and clar- and creating none. With less than to clarify speech - useful range ity from 30 to 18,000 cps -high one milliwatt input, retains every 30 to 15,000 cps - sensitivity 2.5 impedance for tube circuits -160V shading of tone and dynamics from mV bar at 1 kc with high imped- polarising current from dry cells 30 to 20,000 cps. Easily disas- ance- resistance to high humidity or easily tapped from instrument sembled for cleaning, instantly fit- and close -talk overload - rugged, circuit - sensitivity 3 mV /Mbar - ted to any head. The finest in attractive two -tone plastic case all parts and instructions for easy music listening for only $28 in with table stand -user net $34.95. installation included, net $22.95. mono, or $32 in the stereo model.

If your Dealer cannot supply you with AKG products, write to the USA import and service agents - Electronic Applications, Inc., Stamford, Connecticut.

AUDIO AUGUST, 1960 5 LETTERS Silky Tone .from Silicon Diodes SIR: After I submitted the manuscript for my article on Silicon Diodes in the July, 1960 issue, Orient the Triad Transformer Company brought their S -144A output transformer which was designed for the 7189A's in the tapped screen mode. In designing this new transformer the Triad people have come up with a really fine unit, and I have been able to reduce the rolloff ca- MADE BY UNSURPASSED SKILL OF LONG pacitor on the plate of the 5879 covered in Fig. 9 of the article to 51 µµf. As far as size is concerned, the S -144A will EXPERIENCED OF CRAFTSMEN, LIKE ART LUXIOUS fit on the same height- reducing bracket covered in the original article. SILK GARMENTS, NEAT PRODUCTS ARE L. B. DALZELL, THE 1162 Fleetridge Drive, San Diego 6, Calif. BEST CHOICE FOR STEREOPHONIC INSTALLATIONS. SIR: Mr. Dalzell's article, "The Silicon Diode in Audio Equipment," in the July issue was in- formative but he made an assumption which is nottrue most of the time. That is, if one diode has a PIV of 600 volts, two in series will have a combined PIV of 1200 volts. This is true only if the reverse characteristics of the two diodes are the same, and they usually are not. It would GA -12 not be unusual for the reverse leakage current Engineerd for resonance -free P -68H to vary by 50 per cent about a typical value as given by the manufacturer. Thus if two tracing at 1 -1.2 gr. stylus force. This remarkable 4 speed turntable, 1N2071 diodes were picked off the shelf and Plug -in heads have 4 terminal -tips with synchronous hysteresis motor, 1200 volts applied to the pair in series, one - might drop 400 volts while one so that any type of cartridge can guarantees optimum performance the other would drop 800 volts, thus exceeding the manufac- be mounted. (A spare head is of stereo reproduction. turer's maximum rating. I think that about 75 attached to change cartridge when Specifications: per cent of the PIV rating would be a safe figure to use for two diodes in series. 900 volts playing.) Turntable ; 12" diameter alu- would thus be maximum for two 1N2071's. minum diecasting All this depends on the difference between the Speed ; 16 -3/4, 33 -2/3, 45, 78 rpm. diodes. A rating up to two times each PIV can be used selected units are chosen. Probably Power consumption ; 15 watts if most units will withstand about 110 to 120 S/N ; 45 db. minimum per cent or more of the manufacturer's maxi- Wow; 0.25% maximum mum rating. I personally prefer to operate a single diode at 75 per cent of its maximum ratings to ensure a safety margin for long, reliable operation. This is before any considera- tions of a pair in series. Diodes can be checked and matched pretty well by using a variable d.c. supply and a pro- tective series resistor to limit the reverse cur- rent so that power dissipation in the diode is kept under 200 milliwatta at room temperature. The resistor will prevent destruction of the VS-500 diode if the Zener knee is passed. Raise the Features 4-coil moving magnet voltage until 0.2 ma _reverse current flows. The voltage across the diode system with wide range response, dropped will then be the maximum usable voltage and should usually low distortion, surperb channel be greater than 600 volts for a 1N2071. 600 isolation and perfect shielding. volts should still be used as a maximum. Two units with the same leakage current at a speci- Specifications ; NE -20 fied voltage can be considered a matched pair. Combined with utmostly acclaimed Freq. range; 30- 18,000 c/s BRUCE R. KAUFMAN, electorostatic tweeter and 8" Output voltage; 5mV 1,000c /s 624% S. Fifth St., Champaign, woofer in handsomely finished 5cm /sec. Ill. enclosure. Channel isolation ; 30 db This One is For the Birds Specifications : 1,000 c/s SIR : Freq. range ; 35- 20,000 c/s We like man Charles A. Robertson Channel balance ; ± I db. your Input power ; 8 watts (JAZZ AND ALL THAT) very much, particularly Input impedance; 16n 1,000 c/s for his attitude that Dixieland is still a vital Tweeter ; electrostatic type 2 part of Jazz, as contrasted with some of his elements contemporaries and their "let- the -simple -minded. -have- -fun" views. Woofer; 8" dia. permanent cornballs their Don't you think, however, that he missed the dynamic type boat on his review of the Bye Bye Birdie Network ; built -in crossover (Columbia KOL 5510) LP4 The central charac- network (fc -5,000 c /s) AC ter is not a take -off on Elvis, but of fellow 117v. power supply rock -and -roller, Conway Twitty. Conway Twitty -Conway Birdie. Obvious, wet? Dimension ; 350 x 580 x 310 m/m NEAT JIM TANNEHILL, NEAT ONKYO DENKI CO. LTD. P. O. Box 515, 4- Ichome, Kanda Hatagocho, Chiyoda -ku, Tokyo, Japon Fort Wayne, Indiana. (It sure do seem obvious, friend -thanks. ED.)

6 AUDIO AUGUST, 1960 MONAURAL CONSOLE OWNER - WHY DON'T YOU RELEGATE THAT ANTIQUE RELIC

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Controls: Master Volume /Power, Automatic Shutoff, Loudness, Stereo Balance, Dual TroLok Controls (Bass Channels A & B, Treble Channels A & 8), 8 Pposition Selector, FM tuning, AM tuning.t Inputs:I t 2 pair non-shortingg for permanentp simultaneous can nec t' Ion oft multiplex adapter, or TV -1 pair for turntable or changer. Outputs: 4-Channel4 Ch IA &B[ pe, Multiplex 1 &2 Sensitivity: FM-2uvF -2uv or 20 db of Quietingt' on 300 ohmh antenna;t AM -3uv for 1 volt DC at detector; Phono -3 millivolts; Multiplex -110 millivolts; Tape recorder 110 millivolts. Tube complement:P 16 tubes , tuningt a g indicator, 4 silicon diode power rectifiers, 3 ggermanium diodes. SpeakerP Impedances: 8 andd 16 ohms.h Weight:W i ht 26 lbs. Write for complete specifications.

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AUDIO AUGUST, 1960 7 wants in the interpretations and lie gets it with a minimum of fuss. Whether you're deal- ing with records or tapes, I've found it a good rule of thumb to seek out the version that has the on the podium whenever such a choice is possible. These performances of Donkey Serenade, Rose Marie, Vagabond King and Giannina Mia will give many years of service as basic items in a tape library. AigHr Dick Dia: Mandolino Italiano Audio Fidelity AFLP 1923 Audio Fidelity's latest addition to the Italian wing of their catalog ransacks the tonal possibilities of the mandolin. Impressario sTEN in9 Sid Frey, never one to do things in half- hearted fashion, has hired for this recording a mandolinist who, for the past fifteen years, was musical director of New York's leading CHESTER SANTON station specializing In light Italian music. Dick Dia arranged the tunes and plays them with a medium -sized ensemble in a way that length tape at this price. (A few demo tapes reflects every year of his programming experi- on the SMS label have been around at $3.95). ence. The interest in "everyday" Italian music The symbol Q indicates the United It was easy to check the characteristics of that more and more European travelers are Stereo Tapes 4 -track 71/2 ips tape this particular Richmond tape because the bringing back every year has been pushing the number. When Mr. Santon has lis-. Chacksfield orchestra has just been released mandolin into the limelight. This record dem- tened to the tape only, the tape by the parent firm on the London label. The onstrates that the instrument can be put to more use mere number is listed first. Otherwise, results of such a comparison will come as no than serenade strumming. In a the surprise to disc well- rounded program, Dia surprises the metal corresponding tape number is fur- collectors who have encoun- tered instances where an artist was issued by strings with a mazurka and a tango. In a nished by United Stereo Tapes. a record company at more than one price level. moment of abandon, he even tackles one of If the Richmond tape is played first, the bass the favorite display pieces of brass and wood- response will appear to be virtually normal wind Instrumentalists-The Carnival of Ven- Fred Waring and the Pennsylvanians in and the highs more or less acceptable. Switch ice. The AF person -to-person approach in solo miking Hi Fi Capitol Q ZW -845 to the Chacksfield orchestra in the tunes from allows, in this case, a confrontation Paris and Rome and you can spot the differ- of more than average versatility. At full vol- Capitol's initial four -track releases are on ence quite easily on a properly maintained ume, as in some past releases, you can still the market and I made it a point to try this unit. The bass is firmer on the London reel climb inside the instrument if you care to. one first. The two-track version of Waring in and encompasses lower frequencies. The upper During background listening however, the sonic Hi Fi has been one of my favorite reels for end is sweeter although it takes in more ter- outline of mandolin softens at normal valume the past two and a half years. (When I con - ritory. How much of the difference between and the diversity of the music selected by Dia vered to four track about a year ago, the nar- these two reels is traceable to the master becomes the key feature of the . rower gap of the playback head brought out tapes is the secret of a few insiders at Lon- better high -end response in most of my two - don but I find it difficult to believe that the Voices in Song . . . American Musical track tapes -this one in particular). Old masters are as far apart in quality as these Theatre Time S/2003 ZD -12 has had a lot of use at all sorts of two reels would indicate. We may be witness- listening levels so I knew which sections to ing here an application of a theory long used Time Records has joined the other new out- spot check in ZW -845. At the same volume in the marketing of records. When an artist Is fits who are going in for a brand of exagger- setting, tape hiss is equally low on both reels. put on the market by the same outfit in sev- ated stereo separation that the major firms Frequency response is identical, a situation I eral price ranges, the lower -priced item can- have never indulged in. I'm not referring to would have considered highly unlikely two not be permitted to enjoy a quality of sound the altogether desirable separation of signals years ago. There is one subtle difference be- equal to that of the higher -priced release. that today's stereo cutters can manage in the tween the two -track and that fs While hoping that this theory will not take record groove. It is their new philosophy of noticeable on a large system. You can't meas- too firm root in the tape field, I must admit, studio mike placement that has me wondering. ure it because it's a difference solely in terms in terms of entertainment value, the Million There is a possibility that the newcomers are of presence. There is quite a crowd of per- Sellers do rate a lower price tag. Signal -to- looking forward to wider acceptance of the formers heard in this recording-a mixed noise ratio is about the same in both reels compatible stereo disc proposed a few months chorus and a sizable orchestra. The two-track but the Evening in Paris and Evening in ago by Design Records. Unlike Columbia's com- gives the illusion of about ten per cent more Rome tape has the better . patible disc, rejected by the industry several liveness in the studio and a mike placement Padilla's Ca C'est Paris has just the right years ago, the Design sampler record went in about a foot closer. This difference is subtle atmosphere of the bustle of Parisian traffic for channel isolation to an alarming degree. enough to be apparent only when wives are to set the mood for favorites such as J'Atten- I noticed that killing the left channel of the not in the room. (This is being read, I as- drat, La Vie En Rose, Mademoiselle De Paris Design sampler during playback virtually ob- sume, by more than one husband). Forgetting and a new treatment of Offenbach's Can Can. literated the sound of the vocal soloist. About the considerable disparity in the price of these The woodwind section of the orchestra has its five per cent of voice amplitude could be heard two tapes, the four -track has fifteen selections innings on the Roman side of the reel. The with only the right Channel working. Under while the two -track had only eleven. One of oboist featured in Catari would not sound out such conditions of unorthodox separation, I the added items is a specialty of the Waring of place in England's leading orches- daresay you could play this type of compatible shows, Dry Bones. Tape's superiority in pin- tras. If you go for continental stuff, this is disc for several months with a rusty nail file pointing a sound source gets a real workout top drawer. and still extract separate signals at the end as each phrase pops up in a different section of that time with any stereo pickup. In the of the glee club to the accompaniment of songs from the musical theatre recorded by widely spaced sound effects by the orchestra. Caesar Giovannini: Silk, Satin and Strings Time Records in the disc under consideration. From the opening flourish of I Hear Music to the well -trained Gene Lowell Choir was split the famous Waring sign -off, Sleep, this reel Concertapes Q 4T -3006 into two sections. The four young ladies far is equivalent to a well pa.:ed stage production Rudolf Friml: Indian Love Call on the right -the six men on the left. With with all the buoyancy of the Pennsylvanian's Westminster Q 4T -107 Hal Mooney's orchestra in the background, brand of showmanship. Capitol has rolled up each group has good clarity when heard by some heavy artillery to the sector Both of these tapes offer extra features in itself. Singing together, the sound of the two of tape's latest firing line. background music. The Concertapes reel is halves becomes muddy. They also remain sepa- the more glamorous of the two. Strings throb- rated by a distance proportionate to the spac- bing all over the place -a lot of pastry from ing of one's speaker setup. The effect is forced Frank Chacksfield: The Million Sellers the percussion section. The choice of tunes even when the loudspeakers are only six to Richmond Q RPH-45007 gives an inkling of the producer's goal. eight feet apart. This is mentioned with some Frank Chacksfield: Evening in Paris and Jalousie, Laura, Holiday For Strings are regret because the show tunes -in addition naturals for a full treatment by a large string to the inevitable stuff from Music Man," "My Evening in Rome orchestra working with excellent morale. These Fair Lady" and "Oklahoma " -include rari- London Q LPM 70005 are Mid-Western arrangements that recall the ties such as Friendship from Cole Porter's days when Chicago radio originated many net- "DuBarry Was A Lady" and Tomorrow Moun- The Richmond tape reviewed this month is work shows featuring sizable studio orches- tain from the Ellington- Latouche show "Beg- part of the first four -track release that brings tras in light music. If any nostalgia is in- gar's Holiday." the price of open reels to a figure just a shade duced by this reel, it will first overcome those above a dollar per track. At *4.95, these re- who can rc:nember when radio had the budget Chuck Sagle: cordings from the London catalog are bound for such luxuries. Ping Pong Percussion to win a good share of attention. This is the The Friml tape from the Westminster vaults Epic BN 568 first time UST has made available a standard is a tasty dish -one of the very few reels fea- Under a title of singular candor, Epic pre- turing a leading composer his own sents its answer to the recent stereo percus- It Forest Ave., Hastings -on- Hudson, music. Listener restfulness is built into this N. Y. one because Friml knows exactly what he (Continued on page 74)

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AUDIO AUGUST, 1960 9 There, the center speaker and its volume control gave me a much more natural and useful spread of sound, plus a flexibility, via the volume control, that deals usefully with differing types of stereo material. I'm making a permanent set-up of it-as per- manent as any in my slightly unstable listening arrangements. I've been studying those diagrams hard and, with some trepidation I hereby de- scribe the three ways in which we achieved useful center -speaker sound, derived from D the two regular stereo channels at the UD' stereo amplifiera inputs. I remember all too well the simple- minded pits of confusion into which Ray and I fell, time and again, edward Ztnall Canby in respect to the actual workings of these circuits. (Especially do I remember a long 1. THREE WAYS TO THREE of phasing confusions between. Terrific! session on the concept of "positive- going" SPEAKERS But he didn't even try to explain the plug - and "negative- going; used to describe an ginge to me, that time. instant of theoretical signal amounting to BEFORE HE ENDED his work for me, my Then, alas, Ray left. And about a week a half -wave and theoretically helpful in ex-assistant Ray Prohaska had been later I suddenly needed a stereo amplifier, straightening out which parts of the cir- busy on and off for months on a quickly, to use in the field, and there was cuits -and the speakers -went which way masterly all -in -one triple -play three -speaker nothing to do but commit the ultimate in simultaneously, given identical inputs.). system for my New York apartment. It mayhem, grab dozens of plugs and cables, It's all so utterly simple, this kind of thing, was a system whereby three different means pull them all out and make off with the that like many a great simplicity, the truth of achieving three speaker channels out amplifier-which I did. To be sure, I made has a way of avoiding your finest efforts, of two inputs were combined and could be a feeble attempt to help myself later on: and I admit to frequently recurring baffle- put into operation, each of the three, by maybe I should put colored tape, red tape ment and ditherhood, just when I thought the simple expedient of pulling out batches and blue tape and green tape, around the all was clear. of plugs and inserting different ones. various matching connections as then op- Hence Ray's passel of diagrams, done up These three systems were the result of erating, in case I couldn't figure out the to convince himself as well as me; hence my continuing curiosity as to the various LA and A2 codes. So I stuck a lot of bits his elaborately simple set of battery analo- means by which a practical three -speaker of tape on, here and there and hoped for gies, using single cells as on -paper gen- system might be set up in component form. the best, and in moments the whole thing erators of theoretical positive-going or I chose these three as being of fairly equal was an unplugged shambles. negative -going signals. interest as well as of considerable di- You can guess the rest. Some time many versity; Ray worked up the circuitry, moons later I finally took a long, hard checked the phasing and figured the proba- look at the remains of Ray's plug -together "Pilot" ble and theoretical results we should get system, with a view to reconstruction. Not (as opposed to the actual, upon which we a chance! Reluctantly, at last, I unscrewed One of these systems I have already de- kept all our twenty fingers crossed) and, the whole forest of plugs and sockets, put scribed at some length, and a technical most important, he made the actual physi- all the connecting cords back on the shelf paper appeared in this magazine on it cal hook -ups for me, that gave form and and left a note to my new assistant. Begin awhile before that -we called it the "Pilot" substance to the fine theories. all over again and set things up, for one- system because of that company's use of Ray's enthusiasm sometimes carried him just one-of the three -speaker arrange- the principle, but we set it up in our own farther than I could have imagined. In this ments. That'll be plenty to begin with, way, Pilotless, just to be objective. This triple -threat installation, be made use liter- thank you. three -speaker method is excellent -if it ally of dozens of plugs and sockets on the Fortunately, though, Ray did leave me a happens to work out with your particular various required speaker- amplifier connec- fine sheaf of diagrams and layout patterns, amplifier (or if the amplifier is deliberately tions (including a pair of remote-control most of which at the time I really thought designed for it), but can get you into phase- switch inserts for safety, one for the I understood. I even put a few helpful re- technical pickles in respect to amplifier center speaker and another for one of the marks of my own on the margins -luckily, performance. We were lucky, or Ray was side speakers). When he had done, most of as I now see it. I still have those diagrams cagey; the small Eico AF4 stereo amplifier my floating supply of cables, connectors, and I did hear all three systems; I proved that we altered to operate "Pilot" didn't and the like, were tied up in the system, to myself that they did, indeed, work out, show any noticeable change of response or the output connections of several amplifiers and heard also that there was so little dif- instability. had sprouted an appalling forest of fe- ference between them on casual musical This "Pilot" system involves some fairly male sockets -8 -ohm, 4 -ohm, 16- ohm -all comparison that I decided instantly I would drastic interal modifications of the stereo screwed onto the terminals one on top of leave all measurements and possible dis- amplifier circuit and it is not, therefore, a another; into these went the male connect- tortions to others and go no further than method recommended to the uninitiate- ing plugs, variously for the three differing to reassure myself that I could, in fact, the guy like me, minus my assistant. If systems, all neatly polarized along with enjoy three -speaker stereo by any one of you buy it ready -made, fine and dandy. If the females (but oh! how often do we still the three. That's what was important, as you try it on your own amplifier, be sure end up with a mysteriously reversed phase far as I was concerned. you known your business, and have testing ...) and the pay -off, the whole batch was I might interpolate here, for those who equipment on hand, to find out what's marked cryptically as to function. Once haven't read their back- issues, that last happening. put together, the system of course had to year to my surprise I found that what we The system achieves a center -speaker be marked up for reference -but howl were then innocently calling "three -chan- A + B sum signal by relocating the "zero" 'Round and about the plugs was an im- nel" home stereo reproduction was under point on the output transformers, at the posing tangle of brown shrubbery, the certain conditions a decidedly workable and possible risk of feedback dislocation and connective cables, and it was worth your useful adjunct to the straight two -way ar- life to trace any one of them from end to rangement. RHEOSTAT end; maybe Ray had the whole thing In one of my regular listening spots, to 1 16 50 -u memorized by that time, but he did at be sure, "three- speaker" was unnecessary least conceive of the idea of labeling the and, indeed, impractical; two speakers LEFT I6u plugs and sockets via little loops of mask- flanking a fireplace and an excellent listen- AMPLIFIER ing tape, marked with semi- legible letters ing room combine there to give me all I and numbers, LA, R2 and the like, which need out of two speakers; there's no place told Aim which speaker, which amplifier was for the third, anyhow. But in the other involved. Fine idea, as of that particular place, my eccentrically shaped New York EICO AF-4 1661 moment -for him. apartment, the three- speaker set -up (all worked, too, this triple system. If I three systems) made for a decided im- RIGHT It 16 remember rightly (I can't believe it now), provement in a rather bad listening situa- AMPLIFIER we spent one entire evening during which tion. My two regular speakers, there, are I sat and listened, while he plugged and un- placed at either end of a grand piano (the 0 G oued shifted from corn (0) to 4 -ohm ap to voltage plugged demonstrating each of our three - only possible locations, as I had found prov de sum speaker arrangements in turn, one after by experiment) and at best are considera- the other with only minutes and a couple bly too far apart. Fig. 1

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Exclusive advanced systematized engineering FM Tuner HFT90: Prewired, prealigned, tempera - HWD: 24 ", 121/2 ", 101/2 ". Unfinished birch. Lastest and finest quality parts ture -compensated "front end" is drift -free. Pre - Kit $57.50. Wired $56.50. Walnut or mahog Exclusive "Beginner- Tested" easy step-by- wired exclusive precision eye- tronice traveling on,,. Kit $59,50 Wired $69.50. step instructions tuning indicator. Sensitivity: 1.5 uy for 20 db Bookshelf Speaker System complete with Exclusive TRIPLE quality control quieting; 2.5 uy for 30 db quieting. full limiting KM factory -built cabinet. Jensen 8" woofer, match- Exclusive LIFETIME guarantee at nominal cost from 25 uy. IF bandwidth 260 kc at 6 db points. Both ing Jensen compression- driver exponential horn IN STOCK Compare, then take home any cathode follower & FM- multiplex stereo - EICO outputs, prevent obsolescence. Very low distor- tweeter. Smooth clean bass; crisp extended equipment right "off the shelf"- from 1500 highs. 70- 12.090 cps range, 8 ohms. HWD: - tion. "One of the best buys in high fidelity kits." 23" neighborhood EICO dealers throughout the U.S. x 11" x 9". Kit $39.95. Wired $47.95 and Canada. - AUDIOCRAFT. Kit $39.95'. Wired $65.95'. Cover $3.95. 'Less cover, F.E.T. incl. NFS2 Omni -Directional Speaker System (not illus.) NF61 Stereo Amplifier-Preamplifier selects, HWD: 36 ", 15's ", ". "Fine for stereo" AM Tuner HFT94: Matches HFT 90. Selects Ill, - amplifies, controls any stereo source & feeds it "hi -fi" MODERN HI-Fl. Completely factory-built. Mahog- wide (20 -9000 cps (r,) - 3 db) or weak -station thru self -contained dual 14W amplifiers to a pair any or walnut $139.95. Blond $144.95. of speakers. Provides 28W monophonically. narrow (20 -5000 cps (a - 3 db) bandpass. Tuned RF A. New Stereo Automatic Changer /Player: lam -proof Ganged level controls, separate balance control, stage for high selectivity sensitivity. Pre- eye- "One 4- speed, all record sizes, automatic changer Independent bass and treble controls for each cision tronice tuning. of the best channel. Identical Williamson -type, oush -pull available." --HI -FI SYSTEMS. Kit $39.95. Wired and auto /manual player. New extremely smooth, $65.95. Incl. cover & F.E.T. low distortion moisture -proof stereo crystal EL84 power amplifiers. "Excellent " - SATURDAY REVIEW. "Outstanding ... extremely versatile." New FM /AM Tuner HFT92 combines renowned cartridge designed integrally with tonearm to mid -range resonances. Constant 41/2 ELECTRONICS WORLD. Kit $69.95. Wired FICO HFT9C FM Tuner with excellent AM tuning eliminate - grams stylus force is optimum $109.95. Incl. cover. facilities. Kit $59.95. Wired $94.95. Incl. cover to prevent groove & F.E.T. flutter distortion. No hum, turntable attractions, HF85 Stereo Preamplifier: Complete master acoustic feedback, center -hole enlargement. stereo New AF -4 Economy preamplifier -control unit, self -powered. Stereo Integrated Amplifier Only 103/4" x 13 ". Model 10070: 0.7 mil dia- Distortion borders on unmeasurable. Level, bass, provides clean 4W per channel or 8W total out- mond, 3 mil sapphire dual styli, & treble put. Kit $59.75. controls independent for each channel $38.95. Wired $64.95. Incl. cover & F.E.T. 1007S: 0.7 mil,3 mil sapphire, $49.75. Incl. FET. ganged or for both channels. Inputs for phono, HF12 Mono Integrated Amplifier (not illus.): Com- head, tape mike, AM, FM, & FM- multiplex. One plete "front end" facilities & true hi -fi perform- tShown in optional Furniture Wood Cabinet each auxiliary A & B input in each channel. ance. 12W continuous, 25W peak. Kit $34.95. WE71: Unfinished Birch, $9.95; Walnut or "Extreme flexibility . . . a bargain." - HI -FI Wired $57.95. Incl. cover. Mahogany, $13.95. REVIEW. Kit $39.95. Wired $64.95. Incl. cover. New HFS3 3 -Way Speaker System Semi -Kit com- ttShown in optional Furniture Wood Cabinet New HF119 100 -Watt Stereo Power Amplifier: plete with 'actory -built ?a" veneered plywood (4 WE70: Unfinished Birch, $8.95; Walnut or Dual 50W highest quality power amplifiers. 200W sides) cabinet. Bellows- suspension, full -inch ex- Mahogany, $12.50. peak power output. Uses superlative ultra -linear cursion 12" woofer (22 cps res.) 8" mid -range connected output transformers for undistorted speaker with high internal damping cone for EICO, 33-00 N. Blvd., L.I.C. 1, N. Y. A-8 response across the entire audio range at full smooth response, 31/2" cone tweeter. 21/a cu. ft. Show me how to SAVE 50% on easy -to -build power, assuring utmost clarity on full orchestra ducted -port enclosure. System O of 1/2 for top -quality Hi -Fi. Send FREE catalog, Stereo Hi -Fi & organ. 60 db channel separation. IM distortion smoothest 'requency & best transient response. Guide plus name of neighborhood FICO dealer. 0.5% at 100W; harmonic distortion less than 1% 32- 14.000 cps clean, useful response. 16 ohms from 20- 20.000 cos within 1 db of 100W. Kit impedance. HWD: 261/2", 13'8", 143/8". Un- Name $99.50. Wired $139.50. finished birch. Kit Wired $72.50. $84.50. Walnut Address HF87 70 -Watt Stereo Power Amplifier. Dual 35W cr mahogany. Kit $87.50. Wired $99.50. power amplifiers identical circuit -wise to the New HFS5 City _. Zone State superb HF89, differing only 2 -Way Speaker System Semi -Kit com- in rating of the out- plete with factory -built ,1" veneered put transformers. IM distortion 1% olywood at 70W: (4 sides) cabinet. Bellows -suspension, s/e" excur- harmonic distortion less than 1% from 20- 20.000 sion, 8" woofer (45 cos. res.), & 31/2" cone Listen to the EICO Hour, R'ABC -FM, N.Y., 95.5 MC, cps within 1 db of 70W. Kit Wired $114.95. P. $74.95. tweeter. I1.á" cu. ft. ducted -port enclosure. Sys- Mon. to Fri. 7:15 -8 M.,Sat. 11 -12 P.M. 1111811 28 -Watt Stereo Power Amp. Flawless repro- tem 0 of 1/2 for smoothest fret,. & best transient duction at modest price. Kit $43.95. Wired $74.95. resp. 45-14,000 cps clean, useful resp. 16 ohms. © 1960 by EICO, 33 -00 N. Blvd., L. I. C. 1, N.Y.

AUDIO AUGUST, 1960 11 THIS IS THE GREATEST `CONTINENTAL' OF THEM ALL...

4.

Fig. 2

associated trouble. (We had none.) Our new center tap was at the original 4 -ohm point; the central speaker took off from the original "O" on one amplifier, now be- come -4 ohms, and from the 16 -ohm tap on the other, which would be +4 ohms. Net result, if you follow me, was a 16 -ohm output of A plus B. The side speakers CONTINENTAL `400' tapped from the ex -16-ohm (now +4) pointa on each amplifier to the ex -zero, as New 4 -track above now - 4, the result being again 16 The stereo- record /stereo -playback ohms of channel A and channel B respec- exciting tively. Clear as mud, isn't it specifications tape recorder It works very nicely, once your amplifiers on the new Norelco guild- crafted by themselves have been checked out as OK in this new and slightly dizzy output ar- CONTINENTAL '4OO' Philips of the rangement. The feedback complications are (EL3536/54) provide only Netherlands strictly for the experienced pro to solve - an indication of what "the great- if he can. I note that in the "Pilot" battery analogy est Continental of them all" holds in set up by Ray (Fig. 2), 3 volta into each store for the music lover, studio-recordist or channel measures three volts at each of the high fidelity enthusiast who is seeking a profes- three speakers -i.e., the center speaker sional quality stereo moehine at a modest prier. volume is the same as that of the outside speakers, given an equal signal. In prac- FOUR -TRACK STEREOPHONIC RECORDING AND tice, I've found, the center speaker should PLAYBACK FOUR -TRACK MONOPHONIC RECORDING be cut down considerably below the outside Too much center THREE TAPE SPEEDS -17/8, 33% AND 71/2 IPS pair for most stereo sound. AND PLAYBACK volume weakens the stereo effect, tends to COMPLETELY SELF- CONTAINED, INCLUDING DUAL RECORD- blend it into plain mono -in- the -middle. ING AND PLAYBACK PREAMPLIFIERS, DUAL POWER AMPLIFIERS AND TWO NORELCO WIDE-RANGE LOUDSPEAKERS (SECOND IN LID) E -V ST -1 CAN ALSO BE USED AS A QUALITY STEREO HI -FI REPRO- One of our three systems was commercial SYSTEM WITH TUNER OR RECORD PLAYER -an Electro -Voice transformer that takes DUCING and AND MIKE INPUTS the partial output of one amplifier FACILITY FOR MIXING PHONO passes it on, 1:1 but isolated, in reversed HEAD -GAP WIDTH- .00012" FREQUENCY phase as shown in Fig. 3. This is a tricky RESPONSE -50 TO 18,000 CPS AT 71/2 IPS WOW AND FLUTTER -LESS THAN .15% For a AT 71/2 IPS SIGNAL -TO -NOISE convincing SUM RATIO -48 DB OR BETTER demonstration CROSSTALK - 55 DB of all of the features LEFT STYLED BY and qualities that AMPLIFIER PORTABLE make the Continental THE CONTINENT'S `400' the greatest TOP DESIGNERS 'Continental' of them 50L, A Norelco 6 dual element RUGGED all," visit your favorite RHEO stereo - hi-fi center, or photo dynamic dealer, or write for RIGHT microphone AMPLIFIER is standard complete literature to: equipment North Ameracan Philips Co.,Inc. 1 with the High Fidelity Products Division '400.CONTINENTAL 230 Duffy Avenue, Hicksville, L. I., N. Y. Fig. 3

AUGUST, 1960 12 AUDIO PRICES cui ALMOST 1/3 on Audiotape on 11/2-mil MYLAR

T HAT'S RIGHT ! Audio Devices has cut at least 31% off the price of its premium -quality Audiotape on 11 -mil "Mylar." Now you can enjoy all the advantages of DuPont's fabulous "Mylar" for little more than the cost of ordinary plastic -base tape. Audiotape on 11/2-mil "Mylar" is the finest tape in the Audio- tape line. Its tough, durable "Mylar" base and professional - quality oxide make it the perfect tape for schools, recording studios, radio and TV stations, military users-as well as dis- criminating home recordists. See your Audiotape dealer as soon as possible. At the new low prices, his stock will move fast. (Similar price reductions have also been made on Master "Low Print -through" Audiotape on 1 Sx -mil "Mylar. ") * " Mylar" is DuPont's trademark for its polyester film -the toughest, most durable recording tape base material known to man. "Mylar" cannot dry out or become brittle with age. Radi- cal differences in temperature and humidity have no effect on it. Recording tapes on "Mylar" can't break or stretch in normal use, regardless of temperature or humidity. Most importantly, "Mylar" is a known, tested base material -proven by years of use in telemetry, automation and electronic computing applica- tions. Millions of feet have been recorded by professional and amateur sound recordists, too.

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AUDIO AUGUST, 1960 13 idea, since it avoids the "shorts" you get THE if you just try to hook up your channels TUNG -SOL 6080 FAMILY in parallel for a third speaker. If I remember rightly, the E -V trans- former may be used in various optional All fit the saine socket... ways as outlined in the instructions; our set -up, as the diagram left with me shows, used my Sherwood stereo amplifier un- changed-no internal rewiring-as per one of the E -V circuit suggestions. The outer two speakers are connected conventionally to the 8 -ohm taps. The E -V transformer takes off from the 4 -ohm tap of one ampli- fier output. Its secondary, wound reversed, sends out one lead to the center speaker and the other back to "zero" on the op- posite amplifier. The center speaker com- pletes the circuit out of its other lead into the 4 -ohm tap of the second amplifier. Clear as concentrated asphalt, no doubt, but that's how it looks in the diagram, and that's how it was when it worked. I had heard dire mutterings about the inevitable added distortion with another transformer in the circuit -two is plenty

But which fits your application

There's often a wide choice of tubes which meet one set of electrical requirements. But depending on many other factors, such as the kind of environment in which the .tubes are expected to operate, your choice may be limited. For this reason Tung -Sol produces many tube families for many types of applications where varied operating conditions are expected. Consider the Tung -Sol 6080 family, for example. The 6080, the 6080WA, the 6080WB and the prototype 6AS7G all fit the same socket. The electrical ratings of these series regulator tubes are the same. But which do you need where? Knowing the differences can make all the difference! Technical details on the Tung -Sol 6080 family spelling out the essential differences between these electrically iden- tical tubes are available on request. and maybe too much already, the mutter- The 6080 family is just another fine example of how ings warned. I can only say that the E -V Tung-Sol gives you just the right tube to do the best job. ST -1 didn't have any audibly noticeable Tung-Sol Electric Inc., Newark 4, N. J. effect on the stereo music's quality to this listening musical ear-as usual, we didn't measure. The thing seemed to work per- fectly well and indeed, as I say, there was GET YOUR FREE SUBSCRIPTION TO TUNG -SOL TIPS no very startling difference between it and the "Pilot" system, allowing for a quite you still haven't gotten your free sub- different and more expensive amplifier. scription to Tung- Sol's idely accl aimed I'm prepared to hear further groans monthly series, Tung -Sol Tips, you still can. about undesirable compromises in such a ask your local device but I must say that as a practical Just Tung-Sol distributor or means for acquiring a third speaker out- write directly to Tung -Sol and begin getting put in stereo it works out very simply and your issues regularly. They're jam -packed well. No doubt the increased naturalness with technical information covering many and realism of the stereo sound itself-the significant topics to help the industrial ser- end in view, after all -easily makes up for viceman in his job. whatever minor quality differences there might be, if any. As a general -purpose remedy for bad stereo, where three -speaker sound is indicated, I'm for the E -V ST -1 transformer and suggest you try it if you have a place for such a gadget. Don't use any center speaker, of course, C-SO L® if you already have satisfactory stereo TUN without it. -Don't use any third speaker unless the outer pair are set wide apart, Technical assistance is available through the following sales offices: Atlanta, Ga.; Columbus, too, at least eleven or twelve feet, and more Ohio; Culver City, Calif.; Dallas, Texas; Denver, Colo.; Detroit, Mich.; Irvington, N. J.; Melrose Park, III.; Newark, N. J.; Philadelphia, Pa.; Seattle, Wash. Canada. Toronto, Ontario. (Continued on page 83)

14 AUDIO AUGUST, 1960 BRITANNIA rules the SOUND WAVES with incomparable performance of fine Eng- lish craftsmanship. Your customers will ap- preciate these superb custom components. Known the world over for performance, these, as oll ERCONA products, have been designed for the ultimate in sound repro- NO TURNTABLE duction. We will appreciate your further REGARDLESS OF PRICE inquiry. SERIES 700 WILL OUTPERFORM THE MARK III SPEAKERS

w.weiceee.eti sound systems with an R & A Improve speaker that brings true high fidelity, yet f25 priced unbelievably low for such per- formance. Add one for superb etereo or to extend listening pleasure to other rooms in the home. Co -axial construction in 8 ", 10" and 12" models. net from $1 3.95

DESIGNED FOR THE ULTIMATE IN RECORDING PERFECTION errvrap PROFESSIONAL TAPE RECORDERS Incomparable recording and reproduction of both Stereo and monaural that has be- come the standard of the BBC. Ferrograph will satisfy the most exacting recording requirements and are available in stereo Hysteresis synchronous or standard monaural equipment. Portable motor drive for 33 '/s and 45 or custom models. Audiophile net from For the first time in transcrip- $399.50 tion turntable design you have rpm recordings. the ultimate in performance at a Rumble factor: -50 db when practical price. This remarkable new 2- referred to 7 cm /sec. at 1000 cycle speed Stereo turntable, with its hysteresis signal. synchronous drive, assures you the superb quality offered by any fine turntable re- Wow content is less than .15% and gardless of its price. Custom- crafted and Sutter down to .1 %. is a work of succinctly assembled, each art. Hum level is down 80 decibels. No mass production methods here - merely the unsurpassed skill of fine English crafts- AUDIOPHILE STUDIO -QUALITY watch precision. Com- men working to -like $59.50 NET pare these specifications with any other MICROPHONES Formica- covered base optional for turntable on the market costing considerably - England's most honored line 1 ;14.95 more. You'll be amazed of microphones assure high- est broadcast quality re- cordings. Extremely rugged, each features a durai rib- bon cartridge weighing only CONNOISSEUR INTEGRATED 1.2 mg (1/300 oz.) and STEREO PICK -UP AND ARM triple screen protected. Alf impedances available for the price of a quality pick professional or home use. Audiophile net for -up alone. from $59.50 A superb quality companion for only the finest of turntables, this hand -crafted stereo pick -up and automatic- control arm is unsurpassed. DUPLEX .005/6" diamond stylus; 3.5 gram stylus force; 20- 18,000 cps; ± 2 db; COAXIAL 25 db Channel separation. Automatic control action permits DU 120 arm to be raised or lowered delicately and accurately without touching the pick -up arm. VITAVOX $49.50 Audiophile Net REPRODUCERS Old world precision serving a new world of sound For complete specifications and trade discounts on each write: A truly outstanding 12" dual for full range reproduction and free of distortion and peaks with a nominal fre- ERCONA CORPORATION quency response from below 30 to above Electronic Division 15,000 cps with inbuilt cross over at 2000 cps. Special acoustically designed en- Dept. A -8, 16 West 46th Street, New York 36, New York closures available. Audiophile net: $89.50

AUDIO AUGUST, 1960 Is EDITOR'S REVIEW

DEPARTMENT OF CONFUSION No matter what other people want, this observer would prefer to have two well -spaced speakers behind WITH PRACTICALLY EVERYONE 111 the radio- phono- a single grille so the actual location of the speak- iraph business building stuff which he labels ers was not readily apparent. That will give the best "stereo" and touting it by advertising in the stereo illusion, in our opinion. public prints in words which imply that reproduction is superb, the average listener does not know which HIGH FIDELITY SHOWS way to turn. "Should I buy `hi -fi' or stereo?" seems to be the important question. Only a month away is the New York High. Fidelity We have long felt the high fidelity Show -to be held in the N. Y. Trade Show Building. that industry as Over 100 American a whole has erred in putting too much stress on stereo and foreign exhibits will be un- and not veiled at 4 :00 p.m. on September 7. As the time ap- enough on high fidelity. Any $29.95 phono- proaches graph may be labeled we begin to anticipate the excitement of the "stereo," and no one will raise annual event questions about it. But when a unit of same -we actually enjoy them. the quality In addition to the usual is called "hi -fi," then someone is likely to raise an eye- demonstrations with which brow or two, at least. we are all familiar, two exhibitors have planned some unusual features. Acoustic Research is Without question, there are some good "stereo" sets staging a series available of Live vs. Recorded in which the interna- that are not assembled from components. tionally famous However, most of them seem to put the two speakers Fine Arts Quartet will be compared in a cabinet with directly with recordings of their playing. The sound a spacing not exceeding three feet of the actual instruments which makes the listener sit about the same and the sound of the stereo distance playback system be from the cabinet as he would have to with a five -inch will switched back and forth in- stantaneously, without losing the musical beat. These television set. Under normal listening conditions, there concerts is no stereo effect at all. are to be held four times each day (except Sunday, when there will be We do not mean, by all this, to imply that it is not only two) in the New Or- possible to leans Room of Hotel New Yorker, just across the obtain good stereo reproduction from a street from the Trade single cabinet -provided the cabinet is designed for Show Building. The Quartet will play selections from Tchaikovsky, Bartok, and that purpose. There are some very good single- cabinet other . stereo speakers on the market, and in certain rooms they are even better the conventional Another interesting feature is the McIntosh Mainte- than pair of nance Clinic, which will loudspeakers at a spacing of, say, six to ten feet. We be held in room 606 of the Trade Show Building. All McIntosh owners are in are only referring to those units which may have an vited over -all length four to bring in their equipment for check and adjust- of feet, with the speakers both ment by factory absolutely facing forward, or nearly so, with a spacing of less technicians- free. There is no charge for parts or labor, and each unit will be than four feet. At normal listening distances, there is checked thoroughly no dimensional quality to the reproduction at all. and put into brand -new condition. Visitors to the show may bring their equipment in and All of which leads us to another word- DIMENSIONAL leave it while reproduction. We suggested this possibility to Abra- they are enjoying the four floors of ex- hibits, and on the way out they can pick it up in a com- ham Schwartzman, Executive Secretary of the Insti- pletely new condition. tute of High Fidelity Manufacturers, and his opinion was that it was likely to add more confusion to an al- ready confused picture. Particularly since we now THE CHICAGO SHOW have reverberation, exhibited in depth at the recent While not everyone will be able to attend the New meeting of the National Association of Music Mer- York High Fidelity Show, those who live in the Mid- chants in Chicago. Hi -fi, stereo, component high fi- west may well plan on seeing the Chicago High Fi- delity, reverberation, and now Dimensional Sound- delity -Home Entertainment Show at the Palmer and we use the latter to specify a form of reproduction House, September 23-25. In addition to the usual where the stereo effect is readily apparent. It is a sug- exhibits, this show will feature a full -time FM broad- gestion, however, and we submit it for what it is worth. cast all three days of the show. Station WXFM, Chi- One other item along these lines has long engaged cago, will set up broadcasting facilities at the show our attention. We believe firmly that if a person can and will interview exhibitors both live and by tape see two loudspeakers, he can hear two. In many of the during the show hours, with advance interviews being larger cabinets which house two speaker systems, there presented for some two weeks before the opening day. will be a grille cloth over each one separately, with- Exhibitors will be invited to discuss their own prod- usually-a blank wooden panel between. In discussing ucts, interior decorators will take part in discussions this with one manufacturer and pointing out our be- on how hi -fi stereo equipment can be placed to best ad- lief, he explained that people like the two -speaker vantages in the home, and visitors to the show will visibility because they want other people to know that be interviewed and invited to view the broadcasts. they have stereo -the "status symbol" at work again. See- you there ?

16 AUDIO AUGUST, 1960 more ...so much more for everyone. .. for every application...in the complete line of

Stanton Stereo Fluxvalves *.

Here is responsible performance. .. in four superb models ... for all who can hear the difference. From a gentle pianissimo to a resounding crescendo - every movement of the stylus reflects a quality touch pos- sessed only by the Stereo Fluxvalve.

STANTON Calibration Standard: Model 381 - An ultra -linear professional pickup for recording channel calibration, Collectors Series: Model 380 -A pre- Pro -Standard Series: MK II -A pro - StereoPlayer Series: Stereo 90- radio stations and record evaluation cision pickup for the discriminating fessional pickup outstanding for A fine quality stereo magnetic pick- by engineers and critics...from record collector...from $29.85 quality control...from $24.00 up for the audiophile...$16.50 $48.00

LISTEN!... and will you agree Pickering has more for the best of everything in record reproduction -mono or stereo. More Output More Channel Separation -More Response -More Record Life! -

In short... more to enjoy.., because, there's more quality for more listening pleasure.

* U.S. Patent No. 2,917.590 FOR mOSE WHO CAN HEAR THE DIFFERENCE LISTEN! -Ask for a Stereo FLUXVALVE demonstration your today! at Hi -Fi Dealer ickering e Send for Pickering Tech- Spe°s -a handy guide for planning a stereo high PICKERING & CO., INC.. PLAINVIEW, NEW YORK fidelity system ... address Dept. B -80

STEREO FLU/WAIVE, STEREOPLAYER, COLLECTORS SERIES, PRO.STANDAnn SERIES. CALIBRATION STANDARD ARE TRADEMARKS USED TO DENOTE THE QUALITY OF PICKERINO S. CO., INC. PRODUCTS. "Without speculation there is no good and original observation" - Charles Darwin, naturalist

1 Man's search for scientific knowledge and guiding missiles and space probes first understanding has its taproots in the above took form in the bold speculations of Bell thought expressed by Darwin in a letter to Laboratories scientists. Alfred Rus- his distinguished contemporary, Today, Bell Laboratories scientists and sel Wallace, in 1857. engineers are more keenly aware than ever Speculation- intuitive contemplation of the importance of speculative thinking. guided by past discoveries -led Darwin to The far -reaching scientific and technologi- his famous observations set forth in Origin cal developments of tomorrow are already of Species. Similarly, it led Alexander the subject of advanced research. Among Graham Bell to the invention of the tele- them are radically new materials and de- phone -and has since led to many major vices- basically new switching systems, advances in electrical communications. transmission via satellites, and waveguide networks able to carry hundreds of thou- At Bell Telephone Laboratories, the puz- sands of voices simultaneously. zling flow of current in semiconductors provoked speculation which yielded the Through informed speculation about Na- transistor -and a Nobel Prize. Speculation ture's laws, Bell Laboratories will continue about the behavior of the electron led to ex- to search for the "good and original obser- perimental proof of its wave nature -and vations" which are so vital to the ever - another Nobel Prize. "Brains" capable of improving Bell Telephone System.

BELL TELEPHONE LABORATORIES WORLD CENTER OF COMMUNICATIONS RESEARCH AND DEVELOPMENT Microphone Calibration

The author describes a system for calibrating microphones that does not require the use of a previously calibrated standard. No expensive equip- ment is required, making the system attractive to the audio enthusiast.

DAN PETERS'

oU WOULD CERTAINLY consider a man foolish if he spent several hundred dollars for a fine suit without having this suit properly fitted. Yet, many hi -fi enthusiasts perform a comparable act by spending considerable sums of money for audio equipment and never "fit" the system to its environment. By the use of test records, and low - cost test equipment kits, the serious en- thusiast has at his disposal economical Fig. 2. Rearrangement of equipment for the second step in calibrating a microphone. means to adjust a system properly right up to the amplifier output. However, the phone M, whose calibration is desired, meter, the frequency response and ac- loudspeaker, and the acoustic path be- are placed in juxaposition a distance d curacy of the measuring instruments will tween it and the listener's ear, generally in front of LA. Set distance d the same not affect the results. Use sufficient signal go without quantitive measurements of as your intended test microphone -to- into L.4 to mask any background, noise, any type. Instead, discussions of loud- loudspeaker spacing, because the low - but keep the amplitude low enough to speaker performance rely upon such frequency response of many microphones avoid overloading it. Otherwise the har- vague descriptions as wide -range, boomy, will vary with the distance from the monics will give erroneous results. vibrant, and so on. sound source. The distance will depend Next, connect the equipment as shown Perhaps audio enthusiasts do not per- upon the information desired from the in Fig. 2. Again supply power and form accurate checks upon loudspeakers loudspeaker tests to follow. A micro - measure voltages em and e, , using the and enclosures because such measure- phone-to- speaker spacing of less than same meter as used in the preceeding ments require a calibrated microphone. two feet will help to exclude the effect steps. Actually, the current in LR is the Calibrated microphones are expensive, of room acoustics, while greater spacings quantity of interest and the 1 -ohm re- and the expense is hard to justify, con- provide a measure of effect of the room sistor R, provides a 1 -volt drop for sidering the few times that they are nec- characteristics. Locate the microphone every ampere of current, thereby allow- essary. It shall be the purpose of this with its axis coincident with the axis of ing the use of the same voltmeter as used article to describe a method of calibrat- the sound source since the high -fre- in the other measurements to make this ing any microphone for use as a stand- quency response of most microphones measurement. Use a non -inductive re- ard during frequency -response checks. changes for different angles of incidence. sistor for R,. Feeding an audio tone into LA will An expensive microphone is not nec- After completing the second set of result in a sound pressure po at M and essary. In fact, in lieu of a microphone, measurements at the same frequencies LR thereby generating open circuit volt- a small loudspeaker will serve nicely. as used in step 1 substitute the readings ages, eM and e, respectively. Measure The irregularities in the frequency re- in the following formula to find the and record these voltages at each fre- sponse are not important, since the cali- microphone sensitivity. quency of interest, either by the use of a bration curve will indicate their location millivoltmeter, or by an audio amplifier einem and magnitude, thereby enabling the Sm =K followed by an a.c. voltmeter. Ìf you e,es proper allowance to be made. f make all measurements with the same (Continued on page 79) The method used, the reciprocity principle, was described in a book en- titled "Theory of Sound," by Lord Ray- leigh in 1877; and apparently was not new then. In applying the principle to microphone calibration; two loudspeak- LA ers, one of which must be reversible, and the microphone to be calibrated are em- ployed. The first step consists of setting AUDIO < up the equipment as shown in Fig. 1. OSCILLATOR AMPLIFIER Po Loudspeaker LA serves simply as a sound source. The loudspeaker of your sound system provides a convenient LA, being already connected to an amplifier. The reversible loudspeaker La and the micro- d

171 Reservoir Drive, Boonton, N. J. Fig. 1. Equipment set -up for the first step in calibrating a microphone.

AUDIO AUGUST, 1960 19 1.02 Cubic Feet and 45 cps.

A combination of design approaches makes it possible to achieve exceptionally good "listening" in an enclosure which is smaller than most of us would expect to be acceptable.

RICHARD SEQUERRA

IN GENERAL the past ten or more years PSV -3 loudspeaker system are as fol- have given birth to at least a hundred lows : articles describing revolutionary loud- (1) The frequency response of a loud- speaker systems. Each one, we were told, system should be flat and was the harbinger of a new era in the speaker reproduction of music. Even though completely free of any spurious noises or colorations. there has been a constant imptovement (2) loudspeaker system should be in the state of the art, and the aforemen- The reproducing in the aver- tioned articles have been contemporary capable of age -sized living room, 14 by 20 feet with the improvements, a great deal of more db confusion and question remains with the a 45 -cps tone not than 10 down the 1000-cps level. public at large. from Basically, these articles fall into two (3) The system should be capable of reproducing a sound pressure level groups. The first is a product report, by of about 100 db three the the manufacturer, which establishes the feet from when 10 -watt technical validity of the loudspeaker speaker driven from a system and supplements conventional amplifier. In this writer's opinion, loudspeaker systems should work advertising techniques. The second is the well from modest power amplifiers unusual application of acoustic princi- adequate margin when ples by the home engineering or ad- allowing used with higher ampli- vanced audiofan describing his own the power "one -of-a- kind" loudspeaker system. fiers. (4) The loudspeaker should be Both of these groups have been valuable system to the high fidelity industry and I think small enough to be placed any- where, in any position, to allow for that it is time to add a new dimension in loud- to these groups. the maximum flexibility speaker placement. Let it be stated at the outset that in Fig. 1. The Pilot PSV -3 loudspeaker sys- (5) be in spite of any technical measurements and Since these units are to used tem from the outside. the living room, their styling and tests, (which in the writer's opinion woodcraftsmanship must be in keep- show a design direction only), the yes that all of the factors which determine ing with the finest in design or no judgment of any loudspeaker sys- and' preference are not yet known, while cabinetry. tem is still subjective and it is suspected many that are known are not completely (6) The over -all sound quality must Pilot Radio Corporation, 57.04 Stith understood. stand up under any reasonable A -B Street, Long Island City 1, N. Y. The prejudices involved in the Pilot listening test comparison. (7) Lastly, the price must allow the use of these loudspeaker systems with even the most inexpensive stereo system. The seven preceding points reflect the writer's opinion and judgment. Wher- ever possible, the PSV -3 was designed and developed with these points in mind. Figure 1 shows the external appear- ance of the Pilot PSV -3 loudspeaker system. It measures 18 x 11 x 9 in. The wood panelling is % -in. thick through- out, which completely eliminates cabinet vibration. The cabinet is finished in oiled walnut and the four corners have been given an unusual design treatment by cross veneering. Figures 2, 3, and 4 show front, top, and back views of the speaker mounting module. Figure 2 shows a 6 -in. midrange is Fig. 2. Front view of the speaker panel showing the 8 -in. woofer and the 31/2-in. speaker which front -surface mounted, tweeter at the left and the 6 -in. midrange unit at the right. and the 31/2 -in. tweeter, which is front-

20 AUDIO AUGUST, 1960 i t

without the aid and cooperation of Mr. R. Shotterfeld, Chief Engineer of Pilot Radio. This technique has been success- C2 R2 ful and is analogous to bandpass work .4 tit radio frequencies. 31 2 -IN. TWEETER During the development of this sys- tem "white noise" testing was used ex- tensively noises in eliminating spurious Z=s and colorations from this system. "White noise" is defined as an electrical wave 6 -IN, whose spectrum is continuous and uni- MIDRANGE form as a function of frequency. Since "white noise" contains at one time all audio frequencies at equal amplitude when applied to a loudspeaker system, it shows up to the ear any peaks or holes in the response, as well as the on -off axis 8-IN. WOOFER distribution of sound. Fig. 3. Top view of the speaker panel to It is felt at Pilot that this test is the Fig. 5. Schematic of electrical crossover show the separate housing for the 6 -in. networks. midrange unit. one that most corresponds to subjective evaluation, i.e., a loudspeaker system the speed of sound in the enclosure de- surface mounted coaxially with the 8 -in. that sounds most uniform and peak free creases from 344.8 meters per second to woofer. The edge rolls of the midrange on "white noise" is the one that will be 292 meters per second. Therefore, the speaker have been especially treated to preferred in listening tests. adiabatic or rapid compression charac- eliminate edge resonance. In Figs. 3 and A word of explanation is necessary teristics are changed to isothermal or 4 are shown the 8 -in. woofer and the concerning the front surface mounting slow compression characteristics. This enclosure for the 6 -in. mid- separate of the 6 -in. midrange speaker and the means that with orlon fluff the enclosure range speaker. The components of the 31/2 -in. tweeter. If these speakers are is made to "look" larger. The size of a crossover network are mounted on the mounted behind a 34- in. -or even a 1/4- small closed -box baffle determines the back of this compartment. in.-panel, the defraction or scattering low- frequency system resonance -The Figure 5 is a schematic of the elec- of sound twenty feet off axis is quite larger the box, the lower the system trical crossover network. The electrical noticeable and tends to pin -point the resonance, the smaller the box, the networks designed to work in con- are sound at its source. However, when both higher. with the acoustical mechanical junction are front -surface mounted, they have a An optimum enclosure may be made which have the electrical char- crossovers wide open transparent quality with a smaller and still keep identical acousti- acteristics of 12 db per octave, resulting greatly enlarged polar distribution. cal characteristics by the use of orlon in the frequency division shown in The 8 -in. woofer is a special unit fluff. The low- frequency system reson- Fig. 6. which with a unique treatment is made ance of this system is 66 cps with usable The combination works as follows : to have a free -air resonance of less than acoustic output down to 30 cps. The the low limit of the 8 -in. woofer is set 40 cps. When a woofer operates in a covering on the back of the 8 -in. woofer by its enclosed resonance. The high - small closed -box baffle, the woofer pro- is to prevent the orlon fluff from inter- frequency limit is set by the value of L, duces rapid variations in the pressures fering with the speaker cone. The entire and the mechanical crossover of the of the enclosed air. The temperature of assembly is sealed. moving system. The low limit of the the gas rises when it is compressed and We at Pilot feel that our design con- midrange is set by the size of speaker there is not enough time during the ditions have been met completely and the value of the series its enclosure and operation of the system for the heat to the writer has personally carted two of capacitor. The upper frequency limit is flow away. Hence, the apparent volume the PSV -3 loudspeaker systems around, set by the moving system mechanical of the enclosure "looks" smaller to the one under each arm, to give "on -the- tweeter is the armoured crossover. The speaker unit. However, when such an spot" demonstrations. Up to this point, its low limit is set by the en- type and enclosure is filled with a soft, light- they have received unqualified raves in closure and the value of the series ca- weight material such as orlon fluff, the A -B listening tests by many hard -core pacitor. At the high -frequency end, the heat is permitted to flow away because professionals in the field. lE cone is designed to roll off smoothly from 16,000 cps up. Development of the techniques of working out these electro- mechanical constants could not have been possible

° r " \ ' : ,t- Fig. 6. Approxi- . 5 \ mate frequency I 10 ` responses of the ¡ r t electrical cross- ó 15 .' over networks. . 20 8-'n WOOFER - 6-in. MIDRANGE 31/2-in. TWEETER

Fig. 4. Rear view of speaker panel. Cloth I I I I Illll 20 Ne cover around woofer keeps orlon fluff MD M MMOMMOO FREQUENCY IN CYCLES PER SECOND filling from interfering with cone action.

AUDIO AUGUST, 1960 21 Start with Mono -Build up to Stereo

C. F. BARTON

Although these suggestions come from a dealer and should be followed by every hi -fi specialist, they can be kept in mind by the individual who is planning a high fidelity system for himself.

WII ILE THE TREND Of all advertising is directed towards selling Stereo, there are still many prospects who prefer to keep within their smaller budg- ets and be satisfied with monophonic in- stallations. Our approach to these people is to sell a basic system with two speak- ers and a carefully selected group of components that will lend themselves readily to the later build -up into a qual- ity stereo system. We keep in mind the cost of conversion to stereo and by care- ful selection minimize this cost when stereo is wanted. In this manner we still make a substantial sale and at the same time develop satisfied customers. Custom cabinets are designed with additional component space for the later conversion to stereo, and the speakers are matched, with provision for expan- sion to three -way systems without re- building speaker enclosures. Consideration is given to tape for the future, and in some instances it may be necessary to utilize the space presently provided for record storage. This is done to minimize size and cost of the compo- nents cabinet. Records and tape must of course be stored elsewhere. This is usu- A monophonic system designed with the intent of changing over to stereo as the cus- ally no great problem. tomer's budget con accommodate the additional equipment. Frequently we incorporate the tele- vision chassis in the components cabinet cabinet -to a Bozak 302 system without money, and can choose several different and utilize the better sound qualities of any cutting or altering of the speaker ways of doing it, depending upon the the hi -fi system's amplifier and speaker enclosures. The Garrard RC88, with lift cost and available money to be invested. system. This reduces space requirements up top installation, is of course already For example : in the room and becomes a selling point wired for a stereo cartridge. The balance 1. Speaker system expansion especially appealing to the woman of of the system is composed of a Leak 2. Tuner added the house. TL50 Plus amplifier, and of course the 3. Tape added As an example the custom built mono- Leak Vari -Slope matching pream- III 4. Finally, stereo phonic system shown is, at the present plifier. completed with nec- cessary amplifiers. time, only a phonograph system with To expand to stereo it is only neces- built -in TV. Space above the preampli- sary to change to a stereo phono car- These steps of expansion are more read- fier is provided for a future FM tuner. tridge and replace the preamplifier, ily sold later than at the time of the Drawers are now installed in the space which if done within a reasonable period original sale, particularly if cost is a later to be used for a tape deck. Speaker will have definite resale or trade -in deciding factor. I believe firmly that too enclosures are custom crafted to match value, and add another Leak TL50 Plus much emphasis can be placed on stereo the components cabinet, but are separate amplifier, which completes the system. when a lesser approach such as this will and can be placed elsewhere. However, Tape may then be added, or even before result in more sales of better -quality as now placed they appear to be an in- the change to stereo, as can the FM components. The end result is a better tegral part of the main cabinet. Provi- tuner. satisfied customer due to minimized serv- sion is also made to increase the speaker This method of selling provides an ice interruptions and lower initial in- system -at present a Bozak 207A in each opportunity for the dealer to make re- vestment by the customer. Audio Consultant, 40 Fleetwood Place, peat sales. The customer expands the Bridgeport 10, Conn. system as he has the necessary extra (Continued on page 81)

22 AUDIO AUGUST, 1960 BUYER'S GUIDE SECTION

Along about the first of September, the serious audio fan begins to think about his planned improvements- converting to stereo, adding a tape recorder, or whatever. So that he may have an advance glimpse of the new merchandise which will be available with the start of the traditional buying season, we present the Annual Buyer's Guide Section.

WIT it NEARLY TWO HUNDRED separate items, along with non -advertisers on the card and wail it. \Ve will forward prices of many more items which are not described, them your requests for further information. the second Annual Buyer's Guide is considerably Any compilation of this type is subject to omissions and larger than last year's, and is -we believe-more complete. errors. Any manufacturer not herein represented may be In most instances, a single product is described in each cate- considered to have (1), not been asked for information (our gory from each manufacturer. In Inally cases, this may be mistake; (2), the information was mislaid (ours again), the only product of that manufacturer. When the manu- or (3), he didn't send it (his). If we find enough such facturer offers a wide variety of items -as do, for example, omissions, we shall try to fill in later. Since this is a catalog - those who make loudspeakers -it is obviously impossible to type presentation, it must be pointed out that the state- list everything. However, for more complete data, it is sug- ments made about the various products are the specifications gested that the reader write the manufacturer directly-or as furnished by the manufacturer and are not the results of to us -for specific information. Because of the large number our own measurements or tests. of manufacturers represented in this section, they are not We are sincerely grateful for the co-operation given us coded in the usual fashion on the Readers' Service Card. If by all the manufacturers represented and by their advertis- the manufacturers of interest happens to advertise in this- ing agencies. Without their concerted help we could not issue, you may use the card and encircle the corresponding have prepared this material. We trust you will find it in- J number. If there is room, you may write the name of any teresting and informative throughout the yeiii.

AMPLIFIERS AND PREAMPLIFIERS

plete amplifying system, embodying two 25- sources can be handled ut the same time. An ACRO watt stereo channels which may be combined illuminated indicator panel instantly identi- for 50 -watt monophonic operation when de- fies the program sources and channels being Stereo Preamp Kit. Designed as a mate for sired. Among its features is a matrixing net- used. The power amplifier provides 20 watts the superb line of Acro amplifiers, the Acro work for "three-channel" stereo. Circuitry In- per channel for stereo use or 40 watts for Stereo Preamplifier is an extremely versatile cludes feedback -type equalization plus feed- monophonic operation. Featuring many en- unit which incorporates every essential stereo gineering refinements the AP -40 has two nine - function. Evidencing the advanced design en- position rotary selectors for handling inputs gineering incorporated in the amplifier line, from FM, AM, Multiplex, Phono (mag.), this unit features a printed circuit board and Phono Octal or ceramic), Tape. TV, Aux. A modular design which make construction sim- Mono /Stereo switch permits use of stereo ple and enjoyable. Controls are easily accessi- cartridges with mono records. The Speaker Se- ble and uncluttered and include a selective lector switches operate with a double set of rumble and scratch filter, a mike dub in, output terminals so that program may be di- phasing switch, input level, individual bass rected to local or remote speakers. In addi- and treble in each channel which provide 16 tion there is a variable Blend control, inde- db of boost and 20 db of cut, an input se-

hack around all tubes for minimum distortion. All low -level tubes have d.c. on heaters. Four- teen inputs include two each for magnetic ..: ... . cartridge, ceramic cartridge, tape head, tape r) recorder. tuner, microphone, and multiplex. e ! J Frequency response is 20 to 20,000 cps + 1.0 db at 25 -watts output ; 10 to 30,000 cps +0.5 db at 10 watts. harmonic distortion is leas than 1.0 per cent. Tone controls are ganged and provide 14 db of boost or cut at 50 and pendent volume controls, separate bass and lector with 8 inputs including FM multiplex 10,000 cps. Rumble filter attenuates at the treble controls for each channel. plus switches and tape head, au output selector with 7 rate of 12 db /octave below 30 cps. Silicon for loudness contour, scratch and rumble modes which are indicated on 6 panel -light rectifiers are used in power supply. Engineered filters. Bogen- Presto, a division of the Siegler matrix, and a loudness contour switch. D.c. to the professional standards of other Altec- Corporation, P. 0. Box 500, Pi:ranms. N. J. filament supply on all tubes plus careful de- Lansing equipment, the 353 -A meets every User net price. $199.50 (without enclosure). sign bring the equivalent noise level down to criterion of the most discerning music lover. Metal enclosure $9.95, walnut $27.75. 2 microvolts at the input grid on the low -level Altec Lansing Corporation, 1515 S. Manchester input. Harmonic distortion is less than 0.05% Ave., Anaheim, Calif. User net price. $225.00. BP -50. stereo 50 -watt basic amp $ 99.50 at 1.5 volte output ; intermodulation distor- PR2, stereo control center ...... 99.50 tion is 0.15% at 1.5 volts output. Acro Prod- 355A "Quartet" 20 -w mono ampi $111.00 ucts, 369 Shure Lane, Philadelphia 28, Pa. 350A 100 w mono ampi 171.00 User net price, $09.50 for the kit ; factory 440C Mono preamp 147.00 wired, $114.50 - self- powered kit, $79.50 345 60 -w stereo ampi 270.00 factory wired, $129.50. - 445A Stereo Preamp 189.00 DE WALD Stereo 20 -20, 36-w ster ampi kit $69.50 7'hirtp- Watt Stereo Amplifier. Less than Ultra- Linear II, 60 -w pwr ampi kit 79.50 BOGEN- PRESTO $100 in cost, the Model N- 1200 -B "Concerto" embodies a complete stereo control system and Stereo Preamplifier- Amplifier. Literally n two power output channels with a combined ALTEC home music center (lacking only program continuous-power rating of 30 watts. Included source) the Bogen- Presto AP -40 is designed are a full complement of controls to permit Stereo Amplifier- Preamplifier. This latest to channel either stereo or monophonic pro- full flexibility of operation. Tape-monitoring addition to the Altec -Lansing line of high grams to several places in the home simul- and tape- output jacks permit direct tape re- fidelity equipment, Model 353 -A, is a com- taneously. Further, two different program cording with complete control of volume and

AUDIO AUGUST, 1960 23 back. The problem of distortion, created where available gain is expended on severe bass and treble boost, is thereby avoided. The feedback level around each power amplifier is 27 db, which results in intermodulation and har- monic distortion figures, taken at average listening levels, which fall well within high - fidelity standards. Front panel controls are: Input selector, mode, level, tone, and on -off. Five pairs of inputs are provided for low - and high -gain program sources. A service - selector switch permits parallel or separate operation of the power amplifiers for stereo or monophonic use, respectively. Exact engi- neering specifications were not available at speaker systems as well as center sum -signal press amplifier and speaker. In monophonic opera- tone. Basa and treble controls are included time. Electronic Instrument Co., Inc., tion inputs to either channel drive both am- for each channel. Fourteen input 83.00 Northern Blvd.; Long Island City 1, plifiers and speaker systems. Fourteen input lacks N. Y. User net price, in kit form, $38.95 ; mounted In the rear of the amplifier are iso- factory wired, $04.95. Jacks ; six for low level, eight for high level, lated from each other so any or all of them four magnetic (phono cartridge or tape head). may be used at any time without interference HF81 ster preamp -ampi and two for ceramic, provide sufficient flexi- or signal loss. Hunt level is - 75 db below full kit, $69.95; wired, $109.95 bility for almost any combination of stereo output for either channel and intermodulation HF85 ster preamp .. kit, $39.95; wired. $ 64.95 or monophonic operation. Three output jacks distortion is approximately 1% at 12 watts. HF30 pwr ampi .... kit, $39.95; wired, $ 62.95 plus seventeen controls and switches-in- DeWald Radio Division of United Scientific cluding Independent bass and treble controls Laboratories, Inc. 33-15 37th Ave.. Long for each channel- providing a range of ad- Island City, N. Y. User net price, $99.95. justment to satisfy the most critical ear. EMI Harmonic distortion is 0.8% full rated out- N at -2200, 50 -w comp stereo amp $139.95 put and frequency response is within 1 db N- 50008, 15 -w mono amp 52.95 Forty -1Vatt Stereo Amplifier. Designed to n from 20 to 20,000 cps. Hum and noise is performance standard far surpassing its cont- more than 90 db below full rated output and pact size, the EMI Stereoscope Model 555 is channel separation is better than 50 db. DYNAKIT an integrated preamplifier/amplifier deliver- Fisher Radio Corporation, 21 -21 44th Drive, ing 20 watts (peak) per channel with less Long Island City 1, N. Y. User net price, "Stereo 70" Power Amplifier Kit. This am- than 0.1%, total harmonic distortion at 1000 $159.95. plifier kit is designed to meet the needs of the cps. Features a built -in cathode ray tube discriminating listener for a moderate -power which can be used to achieve precise balance X -202, 50 -w stereo preamp /amp 5229.50 high -performance power amplifier. Engineered either between channels or output level to 400CX, stereo preamp 199.50 for both stereophonic and monophonic opera- speakers, or to check the frequency response SA -100, 50 -w stereo amp 119.50 tion, the Stereo 70 incorporates two 35 -watt of the system as well as turntable rumble. A SA -300, 60 -w stereo amp 179.50 channels which can be paralleled by means of seven -position rotary control is provided for 30A. 20 -w amp 59.50 a convenient switch to provide 70 watts of PR -6. preamp 12.95 single -channel output. The high power capa- bility and low internal impedance of the GENERAL ELECTRIC

. "Stereo Classic" Amplifier. The G -E Model G -7700 is an integrated unit combining a high quality stereo preamplifier with matching power amplifiers on a single compact chassis. Notwithstanding its modest dimensions, it leaves nothing to be desired in audio perform- ance. Power output is 58 watts. 28 watts per channel in stereo operation. Frequency re- sponse is 20 to 20,000 cps ± 0.5 db at rated each channel to select inputs from tuner. microphone, tape head, RIAA, 78, old LP, tape preamp. A function switch permits selection of normal or reverse stereo, monophonic through one channel or combined output of both, and left or right channel only. Four lights Indicate the mode selected. Tone and amplifiers provide excellent damping for all volume controls are separate for each channel types of high fidelity speaker systems, in- while the scratch and rumble filters operate cluding the low-efficiency types, without need for both channels. Operating with the CRT for individual adjustments. Frequency response are the output power monitor switch and the is ±0.5 db from 10 to 40,000 cps ; power re- 60 -cps tone injection switch. There Is a mponse -20 to 20,000 cps without exceeding speaker phase reversal switch plus an out- 1.0 per cent distortion within 1.0 db of 85 put jack for a sum signal which provides a watts. Sensitivity is 1.3 volts rma for 35 watts 1- volt - to drive a third amplifier output. Hum and noise level is more than 90 and speaker. Uses 34 db of negative feedback db below 35 watts. The use of prewired printed and has a damping factor of 30. Distributed output ; distortion is below 1 %. Hum and circuitry, detailed step -by -step instructions In by Scope Electronics Corp., noise level down 88 db and 79 db on low - and pictorial diagrams, enables even the 10 Columbus Circle, New York 19, N. Y. User and high -gain inputs respectively. Channel net price, $287.50. separation is better than 40 db over entire novice kit builder to construct this amplifier frequency range. Output stage of amplifier with complete confidence. Average construc- is operated with fixed bias for optimum ability tion time is about live hours. Dynaco Inc., 817 to handle the low average level plus high N. 41st. St., Philadelphia 4, Pa. User net ERIC peaks of music reproduction. Front panel con- price, including protective cover, $99.95. trols include rumble filter plus continuously Mk II 50-w amp! kit 69.75 Stereo Amplifier-Preamp. The new Model variable loudness- contour adjustment. Rear Mk III 60 -w ampi kit 84.95 2160 stereo amplifier employs two pairs of panel has speaker phasing control. The G -7700 Mk IV 40 -w ampi kit 59.95 EL84's in the output stages to provide outputs is compact despite its large power output, Stereo preamp kit, PAS -2 59.95 of 20 watts per channel, with dual -triode am- measuring 52" h x 15" w x 12" d. The cabinet Preamp kit, mono 34.95 plifier and phase splitter preceding the output is finished in beige vinyl. General Electric Stereo control kit 12.95 stages. Another duel triode serves as the pre- Company, Audio Components Products Sec- Preamp power supply kit 8.95 tion, West Genesee St., Auburn, N. Y. User net price, $189.95. MS- 4000A. 56 -w stereo amp $169.95 EICO C -7600, 40 -w stereo amp 139.95 Low -Coat Stereo Amplifier Kit. This new MS- 2000A, 40 -w stereo amp 119.95 Eico amplifier brings full stereo performance to even the most budget -minded music lover. It is engineered to provide true h1 -fi quality GROMMES at power levels which are adequate for driv- Stereophonic Amplifier. The new Grommes ing high-efficiency speakers to concert volume. 38PG is a stereophonic /monophonic pream- The input selection, mode of operation, tone plifier and 30 -watt power amplifier all in and level controls Insure complete flexibility one compact unit. Featuring ganged controls, of operation. The AF-4 employs a moderate two separate loudness contours, sum -signal single -ganged tone control so that available amp-tone control section providing for two low -level -level speaker output, and silicon rectifiers. Fre- gain, released by this type of control, is con- Inputs and three high inputs quency response is + 0.5 db, 20 to 20,000 cps verted into distortion -reducing negative feed- for each channel. Separate tone controls are provided for' each channel, and the unit is at 1 watt. Harmonic distortion is 0.6% nt further equipped with a ganged loudness con- 15 watts (1000 cps) and intermodulation dis- trol, balance control, stereo-mono switch. and stereo reverse switch. Eric Engineering Com- pany, 1823 Colorado Ave., Santa Monlco, Calif.

FISHER Sterco Audio Center and 36 -Watt Amplifier. Extreme versatility plus solid 18 watt per channel power characterize the Fisher X -100 stereo master audio control and amplifier. In stereo operation the X -100 can drive two

24 AUDIO AUGUST, 1960 tortion is 2% at 15 watts. Hum and noise are 75 db down at the tuner input and 50 db KNIGHT -KIT down at the phono input (below 15 watts). Sufficient controls are provided to achieve Knight -Kit 40 -Watt Stereo Amplifier. Both wide range of adjustments. Sensitivity at the economy and impressive performance are com- Aux and tuner inputs is 0.4 volt; magnetic bined in the Knight -Kit 40 -watt stereo am- plifier, n phono 0.004 volt tape head .0045 ; crystal complete preamplifier and power phono 0.25 volt for rated output. Precision amplifier on a single chassis. Two 20 -watt Electronics, Inc., 9101 King channels may be paralleled for monophonic St., Franklin operation when Frequency Park, Illinois. User net price, $169.95 ; cover desired. response $10.00. is 15 to 35,000 cps ± 1.0 db at 10 watts out-

HARMAN -KARDON Stereo "Citation" Preamplifier and Ampli- fier Kits. Pioneering a new concept in kits, the Harman -Kardon Citation line spares neither effort nor expense to achieve superb channel only, and monophonically. There are quality of music reproduction. Indeed some five dual inputs for virtually any type of believe that the Citation II power amplifier stereo or monophonic source, including micro- (shown) will outperform any amplifier in Its phone. Bass and treble controls permit boost class, kit or not. In any case the top models and cut of 16 db at 30 and 15,000 cps, re- in this line of kits, designed by Stewart spectively. All controls are of the dual -ganged Hegeman, are not inexpensive -they are obvi- type, operative on both channels simultane- ously intended for the quality -at- any -price ously. Distortion is less than 0.1 per cent put. In addition to offering all conventional for 1.25 -volt output. A balance control allows music lover. These models are the Citation 1 functions for 2- stereo preamplifier and the Citation II 120- channel stereo, this unit pro- for a great difference in sensitivity between vides a unique third, or "center channel" speakers. This new unit has been expressly output which permits feeding full-range pro- matched to all Leak power amplifiers. British gram material to a center speaker for elimi- Industries Corporation, 80 Shore Road, Port nation of the 'bole-in- the -middle" effect, or Washington, N. Y. User net price, less cabinet, for feeding an extension speaker for mono- $119.50. phonic listening. Bass and treble controls offer 15 -db boost and droop at 20 and 20,000 cps, Star 50 ster ampi $199.00 respectively. Among other advanced features Ster 20 ster ampi 149.00 are printed circuitry plus printed -circuit switches for ease of assembly ; dual- concentric clutch -type tone controls for Individual or simultaneous adjustment of the two channels, McINTOSH and switch -controlled Fletcher -Munson -type loudness Power Amplifier Kit, In addition to factory - control. Harmonic distortion is less built units, the 30 -watt unity-coupled amplifier than 0.5 per cent at rated output. Allied is Radio Corporation, 100 N. Western Ave., now available in kit form. When completed, the amplifier is identical to the regular factory - Chicago 80, Ill. User net Price. $79.50. wired MC30. Output is 30 watts with a fre- 20 -w stereo ampi $44.50 quency range of 15 to 50.000 spa ± 0.5 db, or Crt-^"" " 60 -w stereo pwr ampi 84.50 20 to 30,000 cps ± 0.1 db. From 10 to 100,000 Stereo preamp 64.95 watt stereo power amplifier, both priced at $159.95 without enclosure. Utilizing the same design concept but reduced in scale and price LAFAYETTE are the Citatiton IV stereo preamplifier and the Citatiton V 80 watt stereo power ampli- 50-Watt Stereo Amplifier Kit. The new fier both to become available this fall. To give Lafayette KT -250A offers remarkable versa- some picture of the quality of these units we tility, high- quality reproduction and distinc- will list some of the performance specifica- tive styling in a low cost unit. Featuring a tions for the Citation II. Power output is 120 unique separation control, clutch- operated watts, or 60 watts per channel. Harmonic dis- volume /balance control, independent bass and tortion less than 0.5 %, 20-20.000 cps at 60 treble controls for each channel, loudness con- watts; Intermodulation distortion less than tour switch, phase reversal switch, plus five 0.5% at 60 watts. Frequency range 18- 40,000 pairs of Inputs (three high -level. two low - cps, + 0, 1 db at 60 watts ; 2- 80,000 cps level) and outputs for tape recording and +0, 1 db at 1 watt. Hum and noise are sum- signal stereo. Special circuit features illac-hit3G better than 90 db below 60 watts. Harman- Kardon Inc., 520 Main Street, Westbury, N. Y. Kit price for the Citation IV will be $109.95 and for the Citation V is $119.95, both with- cps at 15 watts, the output is + 1 db over out enclosure. Walnut enclosure for Citation the range. Harmonic distortion is stated as less I and IV, $29.95; metal enclosure for Cita- than %o/ at 80 watts, with IM distortion tion II and V, $7.95. below 0.5% and hum and noise 90 db or more below rated output. McIntosh Laboratory, Inc., 2 Chambers St., Binghamton, N. Y. User net HEATHKIT price, $120.00. C -20 stereo preamp $225.00 Fifty-Watt Stereo Amplifier Kit. The top MC -30, 30 -w amplifier 143.30 model In the Heath line of stereo amplifier- MC -60, 60 -w amplifier 198.50 preamp kits, the AA -50 provides excellent performance at modest cost. With five switch - selected inputs for each channel -two low level and three high -level -plus an additional MARANTZ low -level input for monophonic magnetic car- are individual bias and balance controls, d.c. tridge, the AA -50 is flexible enough to ac- applied to all preamp and tone-control tubes Stereo Console. The Marantz Model 7 is a commodate a wide variety of equipment. A for low -hum operation, hum balance control. self- powered stereo preamplifier-control unit four -position function switch permits any d.c. power supply which features a high order of versatility, monophonic excellent regulation pro- remarkable of source to be played through either vided by silicon diodes, and use of new low - together with ease operation. voltage, high- current output tubes (6CW5/ It will deliver unexcelled performance when EL86for reduced distortion. Power output used with either stereo or monophonic pro- Is 50 watts total or 25 watts per channel +3 gram sources. Typical of the quality inherent db at less than 1% total harmonic distortion in this unit is the volume control. Especially at 1000 cps. Frequency response is 20 to 50,000 cps ±1 db at rated output. Hum and noise, 70 db below rated output with volume at maximum position at high -level inputs; 50 db down at low -level inputs. Channel sepa- I ration greater than 55 db at 1000 cps. Lafay- ette Electronics Mfg. Corp., 104 -46 Dunkirk St., Jamaica 12, N. Y. user net price, $74.50. channel or through both channels simultane- ously. Stereo features are : a stereo reverse switch, separate balance control, special separation control, ganged volume controls, LEAK and separate concentric bass and treble con- trols for each channel. An output is provided Newly- Styled "Point One" Stereo Prcamp. for a sum- signal speaker. Two circuit boards Impressive new styling enhances the appear- simplify assembly. Harmonic and intermodu- ance of the latest version of the well -known lation distortion are less than 2%, at rated Leak "Point One" stereo preamplifier. Deco- power output. Hum and noise for magnetic rator- designed, the new front panel offers developed for Marantz, each control is in- phono input Is 58 db down from 25 watts; changeable color panels for both faceplate dividually tested for 2 -db tracking at any auxiliary inputs, 70 db down. Heath Com- and knobs, enabling the user to match the point of rotation down to 65 db attenuation ; pany, Benton Harbor, Mich. User lint price, decor of any room. The new escutcheon plate total range is 90 db. Separate step -type feed- $79.95. is interchangeable with the present one, per- back tone controls with identical curves are mitting present owners the option of inex- incorporated in each channel. The steps are SA -2, 28 -w stereo ampi kit $54.95 pensive conversion to the new styling. The in increments of 3.0 db at 50 cps and 2'/ db AA -40, 70 -w stereo pwr ampi kit 79.95 'Point One" includes provisions for playing at 10.000 cps ; both controls are removed SP -2A, stereo preamp kit 56.95 stereo, stereo reverse, left chnnnel only, right from the circuit in fiat position. A full -range

AUDIO AUGUST, 1960 25 balance control permits complete cutoff of no longer necessary. With stereo. rumble either speaker. Frequency response is 20 to again became a problem and hence its re- 20,000 cps +0.5 db. Intermodulation and introduction In this unit. The suppressor op- harmonic distortion are reduced to negligibil- erates only between notes or in extremely L ity. Hum is far below thermal noise. Nine soft passages where rumble becomes a nul- pairs of inputs and three pairs of outputs are sance: in loud passages the intensity of the mounted on rear panel. The Model a, while sound masks the rumble. Utilizing massive, not inexpensive, offers a measure of perform- 14 pound output transformers with OCA7/ ance well in keeping with its price. Marnntz EL34 output tubes, the 272 has a power rating Company 25 -14 Broadway, Long Island City of 88 watts. or 44 watts per channel. Total 6, N. Y. User net price, less cabinet. $249.00: harmonic distortion is only 0.8% and power cabinet, In mahogany, walnut or blond, $24.00. bandwidth is down to 20 cps. li. H. Scott, Inc., 111 Powdermill Road, Maynard, Mass. I mono Audio Consolette $158.00 User net price. $269.95. 2 40-w pwr ampi 219.00 5 30-w pwr ampi 147.00 2998, 50 -w stereo ampi $209.95 electronic crossover 90.00 delivers 40 conservatively rated watts mono- 222B, 30 -w stereo ampi 144.95 8 60 -w stereo pwr amyl 237.00 phonically, or 20 watts per channel for stereo. Distortion at full power is only 0.9% runs at 400 cps- frequency response is 20- 20,000 cps SHELL PACO + 1 db. Hum and noise is better than 59 db clown for low -level inputs and 79 db down for 40 -Watt Stereo Control Amplifier. A com- Sterco Prcump-Amlipfier Kit. The Paco high-level inputs, referred to 20 watts out- plete monophonic- stereophonic control center. Model SA -40 consists of two 20 -watt ampli- put. Eight controls and two switches on the the Shell 20201' "Manhasset' features visual fiers, each with its own preamplifier- control front panel provide sufficient flexibility to ac- balance of the stereo channels by an electronic system, on n single chassis. It is mounted comodate almost any program source. In addi- "eye" tube. Located on the front panel, with in an attractive gold and satin black case, tion there is a hum- adjust control on the rear individual channel balance controls nearby, with satin gold panel to blend harmoniously panel. Comes complete with attractively styled the "eye" permits precise dynamic balancing with all decors. The amplifiers deliver n true gold -finish metal cabinet trimmed in maroon of the input signals. In addition a built -in 20 watts output per channel due largely to and white. Radio Shack Corporation, 730 Com- signal generator provides a reference voltage a well -regulated low- Impedance power supply. monwealth Ave., Boston lt, Mass. User net for balancing. The "eye" is also useful as There is no clipping even on sustained high- price, $79.50. monitor for recording. Controls are also pro- vided for selecting mode loudness contour. AF -15, 15 -watt ampi $39.95 mono channel 1. channel 2, or combined, and AF -12. 12 -watt ampi 29.95 rumble filter. Bass and treble controls are separate within each channel. Power output is 40 watts. or 20 watts for each channel with intermodulntion distortion less than 2 %; SARGENT- RAYMENT harmonic distortion less than 1% between 30 100 -Watt Stereo -Control Amplifier. Designed and 10,000 cps. Frequency response is 30 to for extreme simplicity in operation, the S-R 20,000 cps +1 db at rated output. 18 db of 2051 features specially designed push- button feedback is used with n stability margin of which com- 15 db. Hunt and noise are down 80 db at the switches eliminate the need for the 65 level passages. Distortion is kept to a mini- plex mode switch used on most stereo pre - tuner and auxiliary inputs, db at the tape mum because of the unique main feedback amps. Included in the total of 12 push- buttons input, and 70 db at the phono magnetic input. circuit which eliminates phase -shifting com- are switches for rumble and scratch filter. Shell Electronics Mfg. Corp., 112 State St., ponents. In addition to all the standard con- tape monitor, stereo reverse, and loudness. Westbury, N. Y. User net price, $129.95. trols and switches the Model SA-40 includes : In addition to the push- buttons there are indi- two dual phono inputs to permit the use of vidual bass and treble controls for each chan- both record changer and manual turntable. nel, n SHERWOOD special switching which affords selection of a stereo channel- separation control, additional speaker systems anywhere in the 36 -Waft Basic Amplifier with Stereo Prc- home, and Balance -Right nid Balance -Left nntp. With the new S -4400, a person who now test selector for a simplified aural check on owns a basic amplifier of similar power capa - the balance of two speakers for best stereo bility) or a mono amplifier-preamp can convert results. Frequency response measured at 1.0 easily to stereo. This unit offers the important watt steady -state output is 30 to 90,000 cps control features essential to stereo operation +1.0 db. Intermodulatian and harmonic dis- -dual loudness control, stereo reverse switch, tortion are less than 1.0 per cent and 0.2 phase reverse switch, and function switch. per cent, respectively, at full rated output. The SA -40 is supplied with step -by -step as- sembly instructions and giant-size wiring diagrams to ensure easy and successful as- sembly. PACO Electronics Company. Inc.. 70 -31 84th St., Glendale 27, N. Y. User net price, in kit form, $79.95 ; factory wired, $129.95. speaker phase -reversal control. a balance con- trol. and n volume control. Both scratch and PILOT rumble filters are "notch" type. Outputs in- clude jack for sum -signal output, and separate Sixty-Watt Stereo Control -Center Amplifier. outputs from each channel for tape record- The Pilot 298 is a fine stereophonic amplifier ing. Power output is 100 watts total. or 50 (harmonic distortion 0.5% from 20 to 20.000 watts for each channel at less than 1% !ter- cps at rated power) combined with n versatile m-Hite and 1.5% in termodulation distortion. It also includes a presence -rise switch, phono control center. A of 14 for Frequency response is 20 to 20.000 plus scratch and rumble filters, tape monitor total inputs mono- cps tape head phonic use or 7 pairs for stereo. Fifteen con- or minus 1 db : hum is 85 db below rutted out- switch, output tube balance control, trols include a scratch filter, a rumble tiller, put. In keeping with the design concept evi- equalization. Prennip heaters are supplied and a tape monitor switch. The 24S has denced by the push -buttons, a functional with d.c. for low han. Two low -level inputs Pilot's Stereo -PLUS Curtain -of-sound, an nil- attractive metal cover is included in the base and three high -level inputs are provided for price. Sargent- Rnyment Company, 4926 E. ouch channel. Output section is 36 -watt power 12th St., Oakland, Calif. User net price, amplifier. The S-4400 may be used with any $247.50. other power amplifier for the second channel. or with an S -360, which is a 36 -watt basic 5R2040, 40 -w stereo control ampi .... $189.50 amplifier. Sherwood Electronic Laboratories, 5R5100, 100 -w stereo pwr ampi 183.60 Inc., 4300 N. California Ave., Chicago 18, Ill. SR534, 40-w stereo pwr ampi 106.60 User net price., $159.50. 5 -360, 36 -w basic ampi $59.50 H. H. SCOTT Dilnauraf Sterco Amplifier. A new 88 -watt STROMBERG -CARLSON complete stereo amplifier, the H. H. Scott 64 -Watt Stereo Control Amplifier. Strom - model 272 features the patented Dynaural berg-Carlson Model ASR -8.80 is a completely Rumble Suppressor and n new sum -signal versatile amplifier which can be used for level control. Also included are a phono level stereo or monophonic reproduction and bas ditional speaker connection which can be used controls and acoustic level controls. The been "human- engineered" for use by the less for center fill -in for stereo or for monophonic Dynnural Rumble Suppressor was invented technically inclined. However, sixteen operat- listening in another room. Output is 30 watts in 1946 and was used to delete the noise in- ing controls provide flexibility to delight the per channel or 60 watts total : sensitivity is ' hermit in old shellac records. When the long- 1 volt for full output. Intermodulatlon dis- playing record appeared this suppressor was tortion is less than 0.5 %n and frequency range is 20- 20,000 cps. Each Pilot 248 Is shipped with a certificate showing final test values for that particular instrument. In distinctive brass and black styling. Pilot Radio Corpora- tion. 32-06 36th St.. Long Island City 1. N. Y. ' . tr n' ti7 i ,, ' User net price, $249.50. Ib1 216A, stereo preamp $199.50 240, 30 -w stereo ampi 134.50 264, 60 -w stereo pwr amp! 179.50 i REALISTIC most discriminating audiophile. Indicator lights show the program source in use. Each Forty -Walt Stereo Amplifier. Newest Am- of Its two channels has a continuous power plifier in the Renlistic line, the Stereolyne -40 rating of 32 watts at n harmonic distortion

26 AUDIO AUGUST, 1960 of 0.9 %. Intermodulation distortion is 1% at 20 watts. Frequency response is 18 to BOGEN- PRESTO EICO 88,000 cps plus or minus 0.8 db. The exclusive "output balance signal" permits balancing Sterco Music Center. The new Bogen-Presto Wide -Range AM Tuner Kit. The new Model the two channels by a built -in signal tone. Model RP -40 Stereo Receiver is a versatile HFT94 is a basic AM tuner designed primarily Each channel has its own controls -loudness/ combination stereo tuner, control center and for high fidelity application. It matches ist volume, bass and treble -plus a master gain 40 -watt amplifier capable of channeling either size and appearance the EICO HFT90 FM control which affects both channels simul- stereo or monophonic programs to several tuner, the two tuners making excellent com- taneously. Full frequency feedback provides places in the home simultaneously. The tuners panion units for stereo operation. The HFT94 minimum distortion at all frequency levels. in the RP -40 are said to achieve a 1- microvolt offers a choice of wide bandpass to 14,000 cps D.c. is superimposed on all preamp filaments for high fidelity operation, or narrow bandpass to reduce noise and hum substantially. Match- to 7000 cps when the objective is to receive ing impressive performance with distinctive distant stations. A high -Q filter eliminates appearance, Stromberg-Carlson amplifiers are 10 -kc whistle while reducing response by no decorator designed. Stromberg- Carlson, Spe- cial Products Division, 1400 N. Goodman St., Rochester 3, N. Y. User- .net.'price, $199.90. ASR -333. 24 -w stereo ampi $ 99.95 ASR -422. 40 -w stereo pwr ampi 99.95 ASR -433, 24 -w stereo ampi 129,95 ASR -434, stereo preamp 99.95 ASR -444, 60 -w stereo ampi 169.95 sensitivity. The FM tuner uses a tuned r.f. stage, three -tuned 1.f. circuits with two stages of amplification, dual limiters, and a ratio de- tector, arranged to provide a predetermined level of interstation hush. AGC on FM and TUNERS AVC on AM. Separate tuning indicators pro- vided for AM and FM. Wired for multiplex. The control center and amplifier are essen- more than 3.0 db at 9000 cps. A full -wave ALTEC tially the AP -40 40 -watt amplifier described rectifier and heavy filtering provides a stable in the amplifier product section. Bogen- Presto, hum -free supply. R.P. and I.P. colla are supplied AM -FM Tuner. pre -aligned so that no test instruments are Employing a fully shielded at Division of the Siegler Corp., Paramus, needed for extra large tuning capacitor directly mounted N. J. User net price. $329.50; metal en- satisfactory operation of the com- to the chassis for perfect grounding, the care- closure, $10.75; walnut enclosure, $27.75. pleted kit. Additional features include slide - fully designed circuit layout and complete rule dial, flywheel tuning, auxiliary output isolation between transformers and power TP -40, ster FM /AM tuner $189.50 for recording, and front-panel volume con- mains in the 306A tuner reduce coupling to SRB20, ster recor 219.50 trol. Image rejection is 58 db. Precision tun- STP52, ster tuner /preamp east, ing is achieved by a traveling eye indicator a point that easily exceeds FCC radiation re- $179.50 which quirements. The FM section employs a Foster - west, $182.00 contracts into an "exclamation point" Seeley discriminator, "cascode" low -noise r.f. at the exact center of each broadcast channel. The HFT94 is also available completely wired, DE WALD ready for installation. Electronic Instrument Co., Inc., 0.00 Northern Blvd.. Long Island Stereo Tuner. - Modest price and good per City 1, N. Y. User net price, $39.95 ; fully formmnce are combined in the De Wald Model wired, $05.95. N- 1000-B "Ambassador" FM -AM stereo tuner. Included in the circuitry are eight tubes plus HFT -90 FM tuner ... kit, $39,95; wired $65.95 diode detector and rectifier, with four stages HFT -92 AM /FM tuner kit, $59.95; wired $94.95 of 1.t., including discriminator. Sensitivity Is 3.0 microvolts for 20 -db quieting. Frequency response is 20 to 20,000 cps and hum level is ERIC Simplified FM Tuner. Featuring a tuned r.f. amplifier stage for maximum gain, the 2457 has better than 1.5- microvolt sensitivity for 20 db quieting. The unit employs a Foster - stage, triode low -noise mixer, a.f.e., and two t Seeley discriminator, and is equipped with limiters. AM section has three i.f. trans- AFC with a front -panel defeat switch. The formers for flat pass band, and sensitivity is dial is calibrated in megacycles plus an addi- 3 microvolts on an outside antenna and 50 tional log scale for convenience. and there is microvolts with the built -in Ferrite loopstick. sufficient space to accommodate a multiplex Distortion is less thnn 1.5 per cent at 30 per adapter. Control shafts are sufficiently long to on 1 cent modulation AM and less than per permit installation with a cabinet panel. Out- cent at 100 per cent modulation on FM. stated as being 70 db below LO volt. Response put is from a cathode follower to allow the Cathode follower output. Altec Division, Ling - of a.f.c. is +0.8 megacycles at 100 microvolts. use of an output cable up to 200 feet long. Altee, 1515 S. Manchester Ave.. Anaheim, Output jacks include AM. AM -FM monophonic, Eric Engineering Company, 1823 Colorado California. User net price, less cabinet. FM stereo, AM tape, FM tope, and multiplex. Ave., Santa Monica, Calif. $199.50. The tuner is cased in an attractive black picture-frame housing with brushed -brass face 307A FM tuner $96.00 plate. De lt'ald Radio Division of United Scientific Laboratories, Inc., 35 -15 37th Ave., FISHER AMPEX Long Islnnd City 1. N. Y. User net price, in- cluding cabinet, $99.95. Saper- Scneitive FM Tuner. Introduced by (Note: This material was received just prior to N- 803 -B, mono AM /FM the manufacturer as the most sensitive FM deadline without technical On tuner $77.95 specifications. the N- 804 -B, FM tuner 74.95 tuner in the world, the Fisher FM -100 re- assumption that you would want to see it any- quires only 0.4 microvolt for 20 db quieting how, we included the photograph and a brief with a 72 -ohm antenna. Frequency response description.) DYNAKIT is 20 to 20,000 cps +0.5 db, with a 60 -db Stereo Tuner and Control Center. The Am- signal -to -noise nitro for 100 -microvolt input, pex Model 550 Stereo Control Center and FM Tuner lait. The Dynatuner FM Kit is a and distortion is less than 0.5 per cent at flail AM /FM Tuner is the newest addition to the complete printed circuit design for simple, modulation. The wide -band ratio detector. Ampex line of audio components. This unit virtually error -proof assembly by even the using a matched pair of germanium diodes, combines on one chassis a stereo audio con- novice builder. Designed primarily for maxi- offers completely linear and distortion -free trol center and a stereo AM -FM radio. The operation entirely free of han. Instantaneous - AM and FM radio are independently tuned, acting dual dynamic limiter stages are highly

n:nm linearity and stability, the Dynatuner also maintains a high sensitivity. A tuned r.f. input utilizing a cathode- coupled dual triode provides 4- microvolt sensitivity (IHFM) with excellent rejection of spurious signals and minimum cross- modulation. The 1.f. coils are undercoupled so that alignment can be at- tained by simple peaking methods, using the so that AM -FM stereo broadcasts may be re- tuning eye for an indicator. The use of mini- effective on any signal, whether strong or ceived. Provisions for later addition of a mum phase shift i.f.'s, wide -band detection, weak, eliminating ignition interference and multiplex adapter are included. The audio and linear design has led to a tuner of ex- other noise elements. A Multiplex Separation control center portion provides push -button tremely low distortion. The intermodulation control is included on the front panel. plus selection of five sources : AM. FM, Tape, distortion is less than 0.25% over the useful Main and MPX channel positions on the se- Phono, or External, with further selection range of operation and does not exceed 0.5% lector switch, while power and electrical of Stereo or Single and Listening -Record with a signal level as low as 10 microvolts. connections and space have been provided for functions. Ampex Audio, Inc., 1020 Kifer Dynaco Inc., 3912 Powelton Ave.. Phila- simple plug -its installation of the Fisher Road, Sunnyvale, Calif. User net price, delphia 4, Pa. User net price, $79.95. Avail- $275.00. able about October, 1960. (Continued on page 89)

AUDIO AUGUST, 1960 27 Equalization

The fundamental facts about the elements which affect frequency response of tape recorders should be understood by any serious tape fan, along with the reasons for equalizing and the types of equalization required. Here they are-

HERMAN BURSTEIN

AT VARIOUS TIMES in earlier articles sating circuits is instantly apparent, be- 111111111111 11111 II we have touched upon the subject cause in their absence there would be 111111==111111=== II!:ilII of equalization in tape recorders, grave, deficiencies both in bass and +1 . /illlll0 for example in connection with fre- treble. In other words, bass boost and M011111111M 11I11111111111 1 %11111111= quency response, distortion, and signal - treble boost are needed. o 11111111! M11111I111 to -noise ratio. The purpose of the pres- The following discussion will deal with -10 ent article is to bring together the vari- the factors responsible for the bass and ÌÌÌÌÌÌÌÌ ÌÌ11111 ous aspects of the subject and present in treble losses; with losses that vary with _20 111 II I111111=11111111 one place a composite picture of this wavelength and tape speed compared 11!:il111111111111 - 30 complex topic. Without an understand- with those that vary purely with fre- ÌÌ iiMIiiÌ ÌÌliiiiÌÌÌÌÌii ing of equalization the tapefan cannot quency; with the optimum location of INC I1 [VC. ISM IBIOCOMO have a full basic comprehension of the compensating circuits as between record Fig. 2. an "ideal" playback recorder. with the NAB equaliza- Output of tape and playback; assuming equal recorded flux on in head, Perhaps the best way to launch the tion curve; with possible variations the tape at all frequencies. discussion is to consider what the record - equalization at a given speed; with playback response of the tape recorder changes in equalization as tape speed is 1. Velocity Characteristic of the Play- would be like if there were no frequency changed; and with the basic types of back Head. Assuming a tape is recorded compensating circuits in it. A typical un- equalization circuits employed (in ele- so that it contains equal amounts of sig- equalized response curve appears in mentary terms). nal (magnetic flux) at all frequencies, Fig. 1 for a machine operating at 7.3 the response of an ideal playback head ips, with bias current at a value normally Record and Playback Losses would be as in Fig. 2, that is, rising used. The need for frequency-compen- Following are the factors that account steadily with frequency. A tape head is for the departure of the curve in Fig. 1 called a "velocity device" because its output depends upon how rapidly the * 980 Twin Lane E, IVantagh, N. Y. from flat response. magnetic field presented by the tape to the head changes, in other words upon the velocity of this field. The higher the frequency, the greater is the rate of .10 change of the magnetic field on the tape -i.e., the more cycles there are per sec- OUTPUT AT 1000 cps - 0 db ond -and therefore the greater is the o output of the playback head. This ac- Fig. 1. Unequal - I counts for the sloping portion of the ized record -play- 1, back response of d 10 left side of Fig. which is a straight 5 line is only tape recorder, 7.5 0 line. (The perfectly straight ips, .00025 -in in theory. In practice, the line tends to 20 head gap. á ----...... \ wiggle a bit (contour effect) at the very low end and to decline more than is p \ 30 shown (wrap effect) due to interactions between the tape and the entire head. However, the line is sufficiently close to ]0 1000° 100 Imo 10000 straight to be described in that manner.) FREQUENCY IN CYCLES PER SECOND The following factors account for the

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The SONY/SUPERSCOPE commitment to perfection has led to revolutionary achievements in the audio electronics field. The STERECORDER 300, for example, is unquestionably the most versatile, perfectly performing stereo tape recorder on the market today. The Sony -developed gold membrane in the C -37A Condenser Microphone is another example of Sony superiority. The 262 -SL sound -with-sound tape recorder at $199.50, the 262 -D four track stereo recording and playback tape transport at $89.50, the 101 transistorized dual track monophonic recorder at $99.50, and the many other Sony /Superscope products are all remarkable achievements; the inevitable results of Sony /Superscope's commitment to engineering perfection. For literature, or the name of your nearest franchised dealer, write: Superscope, Inc., Dept. 2, Sun Valley, California.

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AUDIO AUGUST, 1960 29

11111111:111111111111111111 .10 11HH- A .00025 in. GAP AT7.5 ips o 111111111111111111111111111 - B - .00009 in GAP AT 7.5 ip IIiI IC:CIIIIIINED61IC C - .00009 in GAP AT 3.75 ips 11111 11111mmi11i.1m I 0 A -20 11111111 I 1111111=111111111 101 D allii I11111111111111=E11111111M 5 B M1111 7 1111111111=11111111111111111 111 Fig. 5. Losses due 0 30 11I111111111 to gap of the play- 10 C 1111111111 back head. 15 = á

Fig. 3. Typical demagnetization loss in recording at 7.5 ips. NOTE: LOSSES SHOWN PRESUME MAGNETIC GAP ABOUT 10% WIDER THAN THE PHYSICAL sloping portion of the right side of DIMENSIONS OF THE GAP

I 1 1 1 Fig. 1. I s0 sooro 2. Demagnetization Loss loo ' laro 10000 in Recording. FREQUENCY IN CYCLES PER SECOND When a signal is recorded on the tape, the magnetic particles of the coating ar- Playback Heads. The magnetic fields ble of reproducing at a given tape speed range themselves to form the equivalent passing through the core of a tape head Curve (A) in Fig. 5 shows the declining of small bar magnets along the length of induce what are known as eddy currents treble response at 7.5 ips for a playback the tape. Each such magnet has a south in the head. Also, the core to an extent head with a gap of .00025 in.) which pole and a north pole. The higher the resists magnetization and demagnetiza- used to be fairly standard. Curve (B) frequency, the larger is the number of tion, this resistance being referred to as shows the virtually negligible loss at 7.5 bar magnets formed in a given span of hysteresis. Both phenomena represent a ips with a modern head having a gap of tape. That is, the shorter is each magnet. dissipation of energy. This dissipation but .00009 in. On the other hand, even The north and south poles of a magnet of energy increases with frequency, re- with a gap of .00009 in. there is a signi- tend to have a cancelling effect upon sulting in treble losses. However, in mod- ficant loss at 3.75 ips, as shown by each other, and the closer the poles are ern h'gh- quality heads, the treble losses Curve (C) in Fig. 5. to each other the greater is the can 6. Electrical Losses of the Playback ceiling effect, which is called demagneti- IM1111111111111 1 Head. The inductance of the playback zation loss. Thus as frequency rises, .10 M1111111111111M111111MI head winding, together with capacitance demagnetization losses increase quite 111111111111 across the head- capacitance of the rapidly, resulting in treble losses such o IIIIIIfBR'!I winding itself, of the cable to the play- as shown in Fig. 3, based on a tape -10 CC:IIII°C:ICIIIG`1 back amplifier, and of the amplifier itself speed of 7.5 ips. ENu1IIII1111111111111111111111=11111111111111 -can produce a significant drop in 3. Bias Erase in Recording. Bias cur- -20 MEIIIIIIMi111111= treble response, as illustrated in Fig. 6. rent, which is applied to the record head 111111111111=111111= Usually, however, in a well -constructed in order to reduce distortion and in- IIIIIIIIIIIIM1 tape recorder the capacitances are kept crease the amount of signal recorded on low enough to avoid undesirable loss. the tape, also causes this head to behave Therefore it will be assumed in further in the same manner, but to a lesser de- Fig. 6. Typical high- frequency loss due discussion that treble loss due to this gree, as when the bias frequency current to excessive capacitance across the play- factor does not take place. is applied (in much greater. amount) to back head. Figure 7 presents a composite picture the erase head. In short, the record head due to eddy currents and hysteresis of the various losses described above. It behaves - slightly as an erase head. The collectively termed iron losses-are quite may be seen that when the various losses recorded frequencies most susceptible to small and often entirely negligible, per- are added up the final result is the un- erasure are the treble ones, because they haps 1 db or so at 15,000 cps. equalized response curve of Fig. 1. do not penetrate the tape as deeply as 5. Gap Loss of the Playback Head. the middle and low frequencies; that is, Wavelength Effect and Tape Speed The upper response limit of the play - the high notes lie closer to the surface, of hack head depends upon the width of its The preceding description of losses the tape. The result is to produce a rela- gap. The narrower the gap, the higher that take place in recording and play- tive drop treble response. in Figure 4 are the frequencies that the head is capa- back has been couched in terms of the shows typical treble loss at 7.5 ips due to the bias current normally employed at this speed. BIAS 111111 ERASE III 4. "Iron Losses" in the Record and LOSS 51 .,II LOSS DUE 70 6 -db PER OCTAVE PLAYBACK HEAD CHARACTERISTIC IP'flj 10 ,111 db 11111111M11111111=1111111111M IIIIIIII1M111111111111111M1 111111 111111mß DEMAGNETIZATION .10 Fig. 7. Composite LOSS 1111111111111111 11111111 111111111 111111=111111111111111111111=1 picture of factors o IIIIIIMiiiia.' D UNEQUAL ZED 1111111111i1111II=1\mi responsible for un- o 111111_.1I11'- 1I':;+ 1i 111111=11111111 equalized record - RESPONSE FYFFIG. 1111 playback j 10 .111"1- 'II response POSSIBLE LOSSES DUE PLAYBACK HEAD -20 111111111111I .1111 % 111111MM111111MEI11111111111, of Fig. 1. TO WRAP EFFECT 111IIIII=MMIIIIIIIMM111IIII111 '.111111_ OTHER LO .SES: -30 IRON LOSSES, OUTPUT AT 1000 CPS = 0 db MINIM WINDING CAPA- TAPE SPEED = 7.5 'Ix M111111=111111=11111111111 CITANCE II/5111111 PLAYBACK HEAD GAP = .00025 in. i111111 BIAS CURRENT = "NORMAL" ro Fig. 4. Typical bias -erase loss in record- fo taro FREQUENCY IN ing at 7.5 ips. CYCLES PER SECOND

30 AUDIO AUGUST, 1960 he loves the sound.. ..she loves the style

The performance of the Medallion XII The unique concept of Medallion XII is incomparably smooth and musically YOU GET BOTH cabinetry contributes still another im- rich throughout its phenomenal re- portant dimension to styling for sound sponse range ... virtually linear from a choice of five distinctive grille 28 to 22,000 cps. This is skillfully ac- styles: Contemporary, Colonial, Swed- complished by three outstanding loud- with the new and ish Modern, French Provincial and speaker components, all beautifully Italian Provincial. Each grille is au- integrated within its precisely matched excitingly different thentically interpreted, meticulously enclosure. Clean bass from the very crafted and carefully hand -rubbed in threshold of feeling is reproduced by a variety of glowing fine-furniture fin- a special 12' high compliance woofer ishes. Simply "Select -a- Style" to match the vital mid -range by a newly your decor ... snap it on ! It's that designed 8' cone speaker ... the very easy! Should your decorating scheme highest frequencies by the fabulous ever change, only the grille needs to new Sphericon Super Tweeter that be replaced. It's that economical! As actually reaches the supersonic range for placement, the compact Medallion of 40,000 cps! And at your fingertips is so perfectly proportioned that it is are network controls that assure per- MEDALLION XII equally handsome as either highboy or fect tonal balance whatever the acous- lowboy ... whether you prefer it di- tics of your room. Further, the highly 3 -way speaker system rectly on the floor, or on its matching efficient Medallion achieves ample out - sculptured base. Here indeed is per- put with any amplifier capable of de- formance surpassed only by the livering as little as ten clean watts. featuring the exclusive Medallion paired for stereo! FINISHES- Walnut, oiled walnut, fruitwood, For a truly exciting visual and aural treat, mahogany. DIMENSIONS -24' X 17' x 12W d. "Select -a- Style" visit your NET PRICES- System: $139.95. Grilles: Con- University dealer. Or write for our temporary, $9.95; Period, $14.95. Base: $14.95. latest high fidelity catalog containing the com- (Enclosure also available without speakers, snap -on grilles plete Medallion story. Desk R -5, University finished or unfinished, and as a ready -to- Loudspeakers, Inc., White Plains, N. Y. assemble kit.) Chair from Herman Miller. A Diri,,ion of Ling -Alter Electronics. Inc. AUDIO AUGUST, 1960 31 +ZO Location of Equalization Circuits

15 ips The designer of a tape recorder has I 1 1 1 1 1 1 I I I I I the +10 _ OUT UT AT 1000 cps - 0 db choice of incorporating the necessary PLAYBACK H AD GAP ', . A0025 in bass boost and treble boost in the record BIAS CURRENT "NORMAL" '':' - amplifier, in the playback amplifier, or o 1 =` in both. The proper choice is that which $ takes into account not only considera- Fig. 8. Comparison -I0 tions of frequency response but also con- 55 iiI1 of unequalized :-I siderations of distortion and of signal-to- record -playback noise ratio. Sometimes economy becomes S response at 7.5 R and 15 ips. important enough a factor to alter the ' picture. 30 The most logical place for bass boost is in playback. At 7.5 ips, well over 30 db of bass equalization is needed to IR ,OR IRR MOO achieve at response at this end of the FREQUENCY IN CYCLES PER SECOND audio spectrum. At lower speeds, the variation of the loss with frequency at All other things remaining the same, a amounts of bass boost required are still a given tape speed. Actually, however, a doubling of tape speed can improve per- in the vicinity of 20 db or higher. Such number of these losses vary with the formance, so far as treble response is quantities of bass boost, if employed in wavelength of the signal recorded on the concerned, from fair to excellent. For recording, would greatly overload the tape -that is, with the distance along the example, it could extend the upper re- tape and produce tremendous distortion. tape occupied by one cycle of the audio sponse limit from 8000 cps at 3.75 ips to On the other hand, a slight amount signal. The shorter the wavelength, the 16,000 cps at 7.5 ips. of bass boost in recording is usually greater is the loss. Inasmuch as the Figure 8 shows us two important tolerable, because in most music and wavelength grows shorter as frequency things with respect to equalization re- speed there is a drop in audio energy rises, at a given tape speed, the loss also quirements. (1) The lower the tapo at the very low end. Figure 9 shows a increases with rising frequency. On the typical distribution of peak audio energy other hand, if tape speed increases, db for an orchestra playing a typical sym- IIIIII111111111111 phonic composition. Hence it is desir- which also increases the wavelength, the +1 111111mIlllllliIlllllli loss diminishes; and vice versa with a able to taper off the playback bass boost decrease in tape speed. We see, there- o ÌiÌÌÌÌiiiiir!liBlir at the extreme low end, and supply bass fore, that the type of loss in question boost in this region in recording instead. 10 ;iiíiiiiiiiiiiiiCiiiiiiiii does not remain the same at a given fre- The most logical place for treble quency. The amount of loss depends on 11111 111111 boost is in recording. At 7.5 ips, over 20 db of treble boost is usually required to both the frequency and the tape speed. 111111M111111MI111111111 Treble losses that vary with wave- achieve flat response. As much or more this length-that is, with frequency and tape =NIMIC:NNHC::111RM is needed at lower tape speeds. If speed -are (1) demagnetization loss in were supplied in playback, it would in- recording; (2) bias erase in recording; ordinately accentuate tape hiss and noise (3) gap loss of the playback head. On Fig. 10. Approximate relative permissible of the playback amplifier. However, if in re- the other hand, the iron and electrical recording level at various frequencies considerable treble boost is used at 7.5 ips. overlead the losses of the record and playback heads cording, does this not tape vary purely with frequency, regardless and cause distortion 1 The answer is that treble of the speed at which the tape machine speed the greater is the required treble two factors permit substantial in recording before the overload is operating. boost. (2) On the other hand, the lower boost (1) As indicated in To make clear how treble losses vary the tape speed, the less is the required point is reached. 9, there is a substantial drop in with tape speed, Fig. 8 shows the un- bass boost. It may be seen in Fig. 8 that Fig. the high end of the equalized record -playback response of a the point at which bass boost should audio energy at offsetting the rise in re- tape machine at 7.5 ips and at 15 ips. commence is an octave lower at 3.75 ips audio spectrum, due to treble boost. (2) When the speed is doubled, a given wave- than at 7.5 ips. This fact should he kept cording level of distortion, one length represents a frequency twice as in mind in later discussion. For the same amount great, that is, an octave higher. Hence the treble loss that occurs at a given fre- +30 -. quency at the lower speed occurs at twice that frequency at the higher speed. .20 db 1111111M1111111=11111111. 111111 +10 A - PLAYBACK EQUALIZATION 10 11 - 11t1111III11111INI 0 111111MM1111111111111 IIIIIIIIIÌ:111111 Fig. 11. NAB tape l`ÓI 0 I1!;M11111011111 I1M1 equalization. S - B - RECORDING EQUALIZATION Cí1111111111111111W:!!111111 Z FOR FLAT RESPONSE fl111111IIIIIIIIIIII D 10 ' 111111M11111111i11111 2 111111111111111=11111 Ir IIIIÌÌÌ 11111111111r 20

20 100 IRO IMO 20000 Fig. 9. Distribution of peak audio energy FREQUENCY IN CYCLES PER SECOND for a typical symphonic composition.

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AUDIO AUGUST, 1960 33 111111111111IIIIII timum location of equalization circuits, NAB playback equalization was origi- 111111111111IIIIIIfi as follows. nally designated as a standard only for 11111I=11IN1I11=11111111 1. It stipulates that bass boost shall the 15 ips speed. However, with im- lo 111111=11111111M11nn= provements in tape machines and in 1111 INI111IIIM111111111111 take place principally in playback, as shown by Curve A in Fig. U. tapes, NAB equalization was also found o MOH lIIN1111IIM1111111111 111 IMI111111iii7111111111= This curve tapers off at 50 cps; practical at 7.5 ips, and by common ac- 111 1U1111111!!11 m ceptance it has become virtually stand- lo 11111m111 II111111\ if perfectly flat response is desired, 111111111111IIIIII the remainder of the bass boost is ard for the latter speed as well. At 111111 so1111m11111m supplied in recording, as shown by speeds below 7.5 ips, it is desirable to IIIIII111111IIIIII Curve B. employ less bass boost than specified by PIN CONO 2. It stipulates that treble boost shall NAB. Thus at these lower speeds it is take place principally in recording, customary to find a similar playback Fig. 12. The NAB recording characteristic except to the extent required to bass boost curve, but commencing at a (signal to recorded on be the tape). compensate losses of the playback frequency that is substantially lower can record at a somewhat higher level as head, namely gap loss and iron than in Fig. 11. At these lower speeds frequency increase, as illustrated in Fig. losses. The latter losses shall he the principles of optimum equalization 10. compensated, if necessary, in play- are followed for the most part, at least To the extent that gap loss and per- back. in the better tape recorders. haps iron losses occur, additional treble NAB equalization does not provide for It would be possible for NAB equali- boost is required above the amount a specific record equalization (treble zation tó be stated in terms of a specific needed to compensate for demagneti- boost) curve. Instead, it simply states recording equalization curve were it not zation loss and bias erase. Such addi- that record treble boost shall be such for the following two factors: (1) At a tional treble boost should be incorpo- that, in conjunction with the playback given tape speed, the amount of bias cur- rated in the playback amplifier for two equalization of Fig. 11, record -play- rent employed varies somewhat from one reasons: (1) to avoid carrying total back response shall fall within certain tape recorder to another. Accordingly, treble in recording to the point where there is a variation in bias erase and in limits, as follows : flat within t 1 db be- excessive distortion results ; (2) because tween 100 and 7500 cps; not more than the amount of record treble boost that is needed. (2) losses, in the the gap loss and iron losses vary with 1 db or 4 db down at 50 cps; and not Iron if any, record head vary from one tape recorder the individual head used for playback, more than 1 db up or 4 db down at and it is not easy to anticipate when 15,000 cps. to another. Since these are supposed to recording a tape on one machine -re- While the NAB standard does not pro- be compensated in the record amplifier, is ferring here primarily to commercial vide for a specific equalization charac- the amount of record treble boost that tape ma- tapes -what kind of head will be used teristic in recording, it does provide for required will vary from one to play the tape on another machine. a specific recording characteristic on the chine to another. NAB equali- While economy is a factor in any tape tape, assuming the signal fed into the In view of the fact that 7.5 ips, recorder, it becomes a dominant factor tape recorder is of equal magnitude at zation has been adopted for it in low -price tape machines, and a com- all frequencies. This recording charac- becomes all the more difficult to prescribe promise is then often made with opti- teristic appears in Fig. 12. The charac- a specific equalization characteristic for 7.5 ips the treble losses mum principles of equalization. Instead teristic of Fig. 12 and the playback recording. At bias erase of providing nearly all the bass boost equalization curve of Fig. 11 bear a due to demagnetization and 15 ips, so that in playback and nearly all the treble complementary relationship to each are much greater than at much more boost least 10 db boost in recording, the bass boost is di- other. That is, given one, the other can treble -at when recording at 7.5 vided equally between record and play- be deduced by allowing for the fact that more -is needed the boost. Thus ips than at 15 ips. back, and so is treble output of the playback head rises 6 db the same equalization circuitry may be per octave (per Fig. 2). Since it is much Variations in Equalization at a used for recording and playback, which easier to measure playback equalization Speed simplifies circuitry and reduces cost. than the magnetic field on the tape, NAB Given equalization is stated as a playback Referring to Fig. 1, it would appear NAB Equalization equalization curve instead of in ternis of that playback bass boost should start- NAB (formerly NARTB) equaliza- the amount of magnetic flux to be re- i.e. attain a rise of 3 db-at about 1000 tion conforms to the principles for op- corded on the tape at each frequency. (Continued on page 71)

+15 +20

+10 II, B

+5 B B- +10 TR BLE a TR a / BOOST BOOST - - BASS BASS I I 0 BOOST 5 BOOST UNEQUAL ZED -" d RECORD- PLAYBACK 10 UNEGUALIZED n RESPONSE AT 7.5 ips 5 RECORD O 15 A O -10 -PLAY BACK > j RESPONSE AT 7.5 ips 20 5 5 25 zo

30 L

355 30

w MOM '0 I l000a '0°°° la ien IN00 IN CYCLES FREQUENCY IN CYCLES PER SECOND FREQUENCY PER SECOND r Fig. 13. Combination of relatively small amounts of treble and Fig. 14. Combination of relatively large amounts of treble and bass boost to achieve flat frequency response. bass boost to achieve flat frequency response.

1960 34 AUDIO AUGUST, pioneer "STEREO-MIMMY" SE-1 (A Long- awaited Earphone for Stereo Use) ENJOY YOUR STEREO ALL BY YOURSELF !

Lote at night when your family as well as neighbors ore fast asleep and if you want to enjoy music to your heart's content and do so with a booming sound coming out of your stereo, you are simply making yourself a nuisance to other people. Especially the dynamic sound of stereo penetrotes far and wide, disturbing peaceful slumber of those already in bed. However to listen to music at almost inaudible sound renders even a splendid music entirely disappointing. This is, there- fore, the very reason there have been persistent demands for a gadget that is capable of reproducing with excellent tone quality from low to high frequency ranges without becoming an annoyance to others. STEREO -MIMMY, an earphone for stereo use, recently placed on the market by the PIONEER is a hi -fi earphone employing a specially designed speaker for the earpiece unit, and it has natural tone quality surpassing that of on ordinary hi -fi speaker. Particularly its low frequency characteristic is note- worthy, reproducting the low bond better than a woofer of large caliber. Accordingly the above- mentioned difficulties are solved completely, and from now on you can enjoy all by yourself enchanting music to the fullest measure with that satisfying stereophonic feeling so famil- iar to every stereo enthusiast. In addition although concen- tional earphones have a common defect that they are apt to tire their users, the PIONEER's " STEREO -MIMMY " dose not give a feeling of fatigue even after many hours' continuous use us it fits snugly into ear and is also very agreeable to the touch. It can be, of course, easily handled by o woman or a child. Besides stereophonic reproduction, " STEREO - MIMMY " has an extensive field of applications such as communications, monitoring reproduction equipments of all varieties, etc.

Model No. 5E -1 Impedance 8 -16 ohms Frequency range 25- 13,000 cps Max. power input 0.5 watt M

5 Otowacho 6- chome, Bunkyoku, Tokyo, Japan FUKUIN ELECTRIC, LIMITED

AUDIO AUGUST; 1960 35 36 AUDIO AUGUST, 1960 ÇJORCHESTRA and CHORUS CONDUCTED BY ALTEC- The distinguished components you see gathered here, under the Altec maestro's baton, are virtuosos in their field. Blending years of sound engi- neering skill with precision craftsmanship and devotion to quality, each Altec member performs in the highest tradition of high fidelity. When you are adding to your present equipment, converting to stereo, or building your own more advanced hi fi system in mono or stereo, you cannot buy finer components and speakers nor achieve surer success than with components by Altec. Yet the costs are in remarkably reasonable range. Compare Altec advances and professional quality at your Altec dealer's. Altec offers you the most complete line of quality matched stereo and mono high fidelity components and systems in the world.

COMPONENTS SHOWN : TOP ROW, LEFT TO RIGHT 402s sass SPEAKER, big speaker sound in compact 8" size. With controlled linear excursion. 14 watts power, 16 ohms impedance, 40- 10,000 cycle range, .45 lb. magnet, 1" voice -coil diameter, 55 cycle resonant frequency, 3%" deep. Weighs 12 lbs., 13 oz. $19.50 415 BIFLEX FULL -RANGE SPEAKER offers a guaranteed frequency range of 30- 14,000 cycles. 25 watts power, 8 ohms impedance, 2.4 lb. magnet, 3" voice -coil diameter, maximum cone resonance of 45 cycles. 151ír,," dia., 7" deep. Weighs about 20 lbs. $67.00 511e SECTORAL HORN, smooth distribution at all frequencies. Use with 802D Driver, 500 - cycle cross -over and 803B Speaker. LF cut -off: 500 cycles. 105/8' high, 23 is" wide, 18%" deep. Weighs about 18 lbs. $39.60 412e BIFLEX FULL -RANGE SPEAKER, offering exceptionally smooth response over entire audible frequency range, in small size. Guaranteed range, 40- 15,000 cycles, 20 watts power, 8 ohms impedance, 1.8 lb. magnet, 3" voice -coil diameter, maximum cone resonance of 50 cycles. 121%" diameter, 5%" deep. Weighs about 14 lbs. $54.00

BOTTOM ROW, LEFT TO RIGHT

802c HIGH FREQUENCY DRIVER with tangential compliance delivers smooth response to 22,000 cycles. Power, 30 watts (nominal). Range: 500 -22,000 cycles with N -500D network and 511B horn; or 800- 22,000 cycles with N -800E network and 811B horn. 16 ohms imped- ance, 1.3 lb. magnet. 311,í6" high, 41fí " dia. Weighs about 8 lbs. $63.00 811e SECTORAL HORN, for use with 802D driver and 800 -cycle crossover, or to be combined with 803B bass speaker, or 415A Biflex. LF cutoff : 800 cycles. 800 to 22,000 cycle range. 903(40' distribution. 8%" high, 18%" wide, 14" deep. Weighs about 11 lbs. $30.00 755c FULL -RANGE LOUDSPEAKER has new slim profile, ideal for built -in installations. Smooth response over audible range of 40- 13.000 cycles. 15 watts power, 8 ohms impedance, 2" voice-coil diameter, 90° distribution. 8%" dia., 21h" deep. Weighs 3.75 lbs $29.95 2000B HIGH FREQUENCY SPEAKER, a direct radiating tweeter with unique gap suspension, built -in cross -over net -work. 14 watts power, 8 ohms impedance, 1500. 18,000 cycle range, .45 lb. magnet, 1" voice -coil diameter, 31k " deep. Weighs 1 lb., 14 oz. $15.00 803B BASS SPEAKER, exceptional linearity over range of 30 -1600 cycles. 20 watts power, 16 ohms impedance, 2.4 lb. magnet, 157íc" dia., 7" deep. Weighs about 19 lbs. $69.60 3000B HIGH FREQUENCY COMPRESSION DRIVER SPEAKER can be used to extend response of the Biflex to 22,000 cycles. 20 watts power, 8 ohms impedance, 3000 -22,000 cycle range, 90x40° distribution. 33í6" high, 47/e " wide, 4'iú" deep. Weighs about 1 lb $42.00

Write for free catalogs: Address: Dept. AD -6D ALTEC LANSING CORPORATION, a subsidiary of Ling -Altec Electronics, Inc. 1515 South Manchester Avenue, Anaheim. California 161 Sixth Avenue, New York 13, New York

for the best in sound systems, choose components by

AUDIO AUGUST, 1960 37 N N C C o0 a) _ F- E 47. E a cai m ó áN° E ÿ.`. v ° ó> l+i á7 V N a¿ Ñ, O VI V C.V ao cówp T t.) aN) d E m a) úL U C_ á E ú C C L0 t ó 7 á á óoa'E°0000'>Emÿ ° O> L Ó O i C E N 3 d U a N a) C ' E É w c 7 f0 N`0 l0 o° N N a E U C N.E 7 L V 7 LÓ O Támt` pá=QvLn °a >+c ' V 0) = v N 7a - « C N U t0 a) a! N a) a) i E 1] > á O C íp N N 7 N C j c c ppc m` Cc UM IO, U O óÁ,`°c10i ->+ N a7 N3 m - O O a) î dLaT+ a 3 AN, ^ in a < p 7 W E m 0 N N.3L 0 .. C T ic ÿ M m M a1 ái ÿ ñ N C in ,'n N o E cp ú OO. 7 E° m y U N (Fn L m Ñ >O o N 9 á d 6 +, V a) 9a V 6 J ÿ m cp d pp al 4 C y N N o L u) l'A á z L a, v ? u c E t I :2 .- : ó L Ñ O x O áE óON O î Ú O C a) O Q'Cm w a0. \' o.x d N E E 3 ° E xy m y m p a ' N »a 0 w d Ñ°O` a Ó c >. E . m «. a a.. o 70 o « c E co a, c c N7 d°au ,@có7--, -, N. O co O V a c ó: m á dco m Zó 2 2 cn ,o a, a d o v. a; ó _Cr n . c ....7, co c 4" LO o o ooES ¿ I- q çC óo > o ÑE I E á° d N 0 O :c y °a 3 t Ñ M Ñ W Ñ Ñ c p, Ú 3 7 00 maw i ç a) ° o o Z ÿ 0p 7 ' E Ç C C G 010 N c o E - ¡ T d 7 2 Z C ú to .0 U L Ñcl- O C l« 1+ O co >, U !_ ó CO o a+ ó ú 3 O a) aC) N C á Ñ L7 E LT :: : á `1 ÿ T f0 Ì0 16 L. U a °-C í7. U w

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38 AUDIO AUGUST, 1960 BUYER'S GUIDE SECTION (from page 37)

MPS -20 multiplex ndnptor when desired. The tionLion features a dual limiter circuit for extra I.f. stages are tint -topped, with an unusually HEATHKIT sensitivity -2.5 microvolts for 20 db quieting wide band for maximum fidelity and mini- -continuously adjustable AFC, prealigned r.f. mum FM -AM Stereo Tuner Kit. Outstanding fea- distortion, plus steep skirts to eliminate tures coils and 1.f. transformers, moving bar type adjacent- and second- channel interference. in both circuitry and styling in the PT -1, "magic eye" tuning indicator. The AM section Included In the circuitry of the FM -100 are a 16 -tube deluxe FM -AM combination, include: features excellent sensitivity -3 microvolts a dual -triode mixer-oscillator, the Fisher three circuit boards for easy construction and for 10 db signal -to -noise ratio, narrow and high 3 Mierogap cascode r.f. stage, four wide-band stability ; wired, prealigned -tube FM wide Lf. bandwidth, moving bar type tuning tuning unit ; meter ; a.f.c. I.f. stages, and a wide -band ratio detector. tuning with on-off indicator, 10 -kc whistle filter, built -1n loop - Four controls on the FM -100 include Tuning, switch, and flywheel tuning. FM and AM stick antenna. Hum both 60 circuits are separate and for sections is Selector Switch, Muting Control, and Multi - individually tuned. db below 1 volt. Harmonic distortion in the plex Separation. Fisher Radio Corporation, FM section is less than 1% (1000 microvolts 21-21 44th Drive, Long Island City 1, N. Y. at 100% modulation). Frequency response of User net price, less cabinet. $159.50. the AM section with narrow 1.f. is 20 to 7000 cps. 6 db down at 3.5 Ire; wide 1.f. is 20 to 600 AM /FM ster tnr, preamp and 10,000 cps, 6 db down at 6.5 kc. Allied Radio 20 -w amp! $349.50 Corp.. 100 N. Western Ave., Chicago 80, Illinois. User net price, $87.50. FM /AM tuner kit $49.95 GENERAL ELECTRIC FM tuner kit 38.95 AM -FM Tuner. Model FA -12 Is a new unit which features high sensitivity, precision tun- ing, and an unusually low hum and noise LAFAYETTE level. It is equipped with an FM multiplex Stereo Tuner Kit. Designed for flexibility, jack for reception of multiplexed programs Cathode -follower outputs with individual the Lafayette KT -500 stereo tuner kit fulfills when used with an adapter. FM sensitivity is virtually every function desired in a stereo 5.0 microvolts for 30 db quieting, and AM sig- level controls are provided for both sections. Other features include variable AM -band- tuner nt a moderate price. In addition, the width, 10 -kc whistle filter. tuned- cascode FM front end, FM n.g.c. and amplified a.v.c. for AM. Unique i.f. limiter design automatically provides the number of limiting and 1.f. stages required for non -flutter reception of weak or strong stations. Depending on signal strength anywhere from one to four limiters or i.f.'s are automatically provided. FM sensitivity is 2.0 microvolts for 20-db quieting. Harmonic distortion is lesa than 1.0 per cent. Frequency response is 20 to 20,000 cps ±2 db on FM. A jack is provided for use of a multiplex con- nals of 200 microvolts /meter provide a 20 -db verter without changing existing circuitry. signal -to-noise ratio. FM frequency response The tuner is housed in a vinyl-clad steel cabi- falls within +2 db of flat from 20 to 15,000 net finished in black with gold trio,. Heath cps, while AM response is down 25 db at 10 kc Company, Benton Harbor, Mich. User net for interference suppression. Tuning meter price, $89.95. indicates center -channel tuning on FM and performance is surprising for this price cate- peak of AM signal, and there is no audible BC -IA AM tuner $26.95 FM -4 FM tuner 39.95 gory. Sensitivity of the FM section is 2 micro- drift. Circuit employs r.f. amplifier stage In volts for 30 db quieting ; AM terminal sensi- both AM and FM channels for increased sen- tivity is 5 microvolts. FM bandwidth is 200 sitivity and reduced noise. General Electric KARG kc and AM bandwidth is 8 kc at 6 db down. Company, Specialty Electronic Components Frequency response is 20 to 20,000 cps ± 0.5 Department, Utica, New York. User net price, Stereophonic Multiplex FM Tuner. A su- db on FM and 20 to 5000 cps + 8 db on AM. $129.95. perior quality FM tuner with built -In pro- Harmonic distortion is less than 1% on FM tection against obsolescence, the Karg CT -2 and less than 1% on AM for 80% modulation. is ready for multiplex FM with controls on Hum level is 80 db below 100% modulation. HARMAN -KARDON the panel and special circuitry. Sensitivity Designed for easy assembly, the kit is built of the tuner is 1.5 microvolts for 30 db quiet- around two printed circuit hoards and pre - Professional FM Tuner Kit. Claimed by the aligned LL's. Lafayette Electronics Mtg. manufacturer to be one of the most sensitive Corp., 104-46 Dunkirk St., Jamaica 12, N. Y. tuners, the Citation III FM Tuner Kit may User net price, $74.50 for the kit ; factory very well be just that if their previous kits . e wired, $124.50. are any indication. Featuring a new front - er.-- 7'ila+.' ' ylyiii' end design, which utilizes the equally new LEAK "Nuvistor," the Citation III has a sensitivity of 0.65 mivrovolts for 20 (lb of quietingwtth . -FM Tuner. The new "Trough-Line'1I" tuner virtually no distortion. We may well ask, - - ---'--.. matches in appearance the newly -styled Leak since this is a kit, is the user going to get the "Point One" stereo preamplifier. Sensitivity of 1.5 microvolts for 20 -db quieting makes practical the reception of FM stations on frig and frequency response is 20 to 20,000 cps +1 db. Hum and noise with unmodulated 1000 -microvolt signal is 65 db below full out- put. Audio output is 5 volts at 100% modula- tion for each channel. The dial is 10" long, -°I-' - Q, calibrated every megacycle. High dial ratio permits precise tuning. Muting controlled by switch on front panel. Twin audio channels give two independent output signals for C) C.) stereo. A third output is available -a pon- h ° de- emphasized detector output for use with any self -powered multiplex adapter. Karg Laboratories. Inc., 30 Meadow St.. South Norwalk, Conn. User net price, $139.50. level of performance XT -1A, FM tuner $199.50 obtained in the labora- XT -3A, FM tuner 290.00 considerable distances. Cathode- follower out - tory? Naturally, this will depend on the care put delivers LO volt and fncilitates the use of exercised by the builder-but every other long output leads with negligible high -fre- possible source of trouble has been engineered KNIGHT quency attenuation. Automatic frequency out. The critical converter -1.f. subassembly is is in the circuitry for drift - factory assembled and control included aligned. Two meters Stereo FM/AM Tuner Kit. This new Knight- free tuning. A magic eye assures tuning are built in to permit home alignment of the Kit Deluxe Stereo FM /AM Tuner features accuracy. Controls include on -off switch. a.f.c. limiters and discriminator. Lead length Is Dynamic Sideband Regulation on FM and pro- off-on, tuning, and local -distance. Chassis sharply defined by a heavy duty terminal vision for a multiplex adapter. The FM sec-ec- dimensions are 101 "w x 791 "d x 3% "h. board. Frequency response is 1 to 52.000 cps +0.5 British Industries Corporation, 80 Shore db with distortion less than 0.1% at Road, Port Washington, N. Y. User net price, 100% modulation and unmensureable at 30% less cabinet, modulation. Hum level is 65 db below 100 $149.00. modulation. Harman -Kardon, Inc., 520 Main St., Westbury, N. Y. User net price. $149.95 MADISON- FIELDING for the kit, factory wired $209.95. WCl wal- nut enclosure $29.95. Low- priced FM Tuner. With high sensitiv- ity-1.5 microvolts for 20 db quieting -the TA 230, stereo AM /FM receiver $259.95 series 630 FM tuner features 360 -kc band- TA 224, stereo AM /FM receiver 199.95 width, an i.f. rejection of 65 db, a hum level ST 360, stereo AM /FM tuner 199.95 55 db below 100% modulation, and variable T 230, stereo AM /FM tuner 119.95 AFC. New type of dial uses a fixed indicator, T 220, stereo AM /FM tuner 89.95 with the dial scale moving behind it. The

AUDIO AUGUST, 1960 39 and a changer or turntable a complete sys- sensitivity is 1.5 microvolts for 20 db quiet- tem is available. The 602 features the ing and hum level is 70 db below 1 volt out- "Simpli-matic Test Panel" which permits put. A multiplex output is provided and multi- balancing the amplifier output tubes using the plex adapters are available. Frequency re- speaker system as an indicator, and "Stereo - sponse is 20 to 20,000 cps + 1 db. An electron Plus Curtain -of- Sound." a special set of eye tube is provided for aid in tuning and .,,_.- speaker connections to effect n monophonic AFC pull-in is 200 kc ± 15 ice with 1 volt at 1111 output front a stereo source. Cnn be used to the detector. The edge -lighted slide -rule dial is designed for easy reading. Four switches are provided including AFC defeat. output defeat. and multiplex. Shell Electronics Mfg.. Corp.. 112 State St., Westbury, N. Y. User O net price. $79.95.

SHERWOOD variable AFC feature permits drift -free recep- tion of the weak stations most tuners usually reject. FM/AM/MX Sterco Tuner. The Sherwood Multiplex adapter can be added easily model S-2200 fulfills todays stereo require- by removing a plate on the surface of the ments with separate reception FM and AM chassis. The panel is of heavy aluminum. of fill the "hole -in- the -middle" or for a speaker simulcasts as well as tomorrow's needs utiliz- finished in brass and black, and the entire ing FM multiplexing. Front panel controls unit is furnished with a vinyl -clad enclosure in another room. Thirteen controls and measuring 4 9/10 x 13 5/16 x 6% deep. Brand switches achieve a high degree of flexibility. Products, Inc.. 256 E. 49th St.. New York 17, Distinctive brass and black enclosure is only N. Y. User net price, $84.95. 5 % "h x 10% "d x 14%"w. Over -all frequency response is 20 to 20,000 cps. FM sensitivity is 2 microvolts and AM sensitivity is 3 micro- MONARCH volts. Pilot Radio Corporation, 37.06 36th St.. Long Island City, N. Y. User net price Stereo FM /AM Receiver. Monarch model with enclosure, $249.50. STA -295 is a complete stereo unit mounted 590 AM /FM ster tun, ster preamp .... $239.50 on a compact chassis. Featuring dual ampli- 480 AM /FM fiers, separate FM and AM tuners (including tuner 159.95 FM multiplex adapter) for simulcast recep- tion. plus n full complement of controls, the STA -245 qualifies ns n music center. FM sen- REALISTIC and internal plug -in space are provided for a Sherwood model AMX FM /AM Tuner. Realistic FM /AM tuner is multiplex plug in adapter. Feateured in the Model S-2200 tuner a modestly priced unit whose specifications is one read like a much more of the most sensitive FM circuits ever costly tuner. Its low - developed, permitting 20 db quieting noise cascode FM front end achieves a sensi- with only 0.95 microvolt ; tivity of 2 microvolts for 80 db quieting signal input 3.6 micro- nt volts affords a signal -to-noise ratio of 50 db. 100% modulation. FM circuit also a separate This unusual mixer, oscillator, AFC. two i.f.'s, double -tuned sensitivity makes FM reception limiter, practical beyond 100 miles. In addition. and a Foster -Seeley discriminator. highly stable coil design, delayed automatic gain control, and Foster- Seeley type discrimi- nator preceded by three limitera, assure n minimum of distortion even with modulation over 100 per cent. The AM section features n selection of either a 15 -kc wide "hi -fi" band - pass or a sharply selective 5-kc bandwidth for listening to weaker stations without noise and interference. A high -Q filter traps out 10-Ice interstation whistle while reducing audio response less than sitivity is 1.9 microvolts for 20 db quieting. 3 db at 8 kc. A built - Sensitivity at the magnetic input in ferrite -rod antenna is pivot -mounted and is 3 milli- may be oriented for best reception of distant volts at 1000 cps; tape input 1.5 millivolts stations. at 250 cps; auxiliary input 250 millivolts FM frequency response is 20 to at 20.000 cps within ± 0.5 db. Sherwood Elec- 1000 cps. Power output is 45 watts. Enclosure tronics is handsomely designed in black The AM section utilizes n tuned r.f. stage, Laboratories, Inc.. 4300 N. California with gold broadband tuned Are.. Chicago 18, Ill. User net price, less case accents and escutcheon. Monarch Interna - i.f. stage with a separate tional. Inc., 7035 Laurel crystal diode detector. Sensitivity of the AM $179.50. Canyon Blvd., North section is Hollywood, Calif. User net price. $219.95. 50 microvolts per meter with a fer- S- 200011, FM /AM rite loop stick. Frequency response of the FM tuner $145.50 section is 20 to 20,000 cps + 1 db ; for the S- 3000111, FM /MX stereo tuner 110.50 PACO AM section 20 to 5000 cps ± 1 db. Distortion is respectively 0.2% and 0.5% at 80% modu- St creo FM /AM Tuner Kit. The Paco model lation. Supplied in gold cabinet with cali- ST -45PA stereo FD1 /ADI tuner kit features brated, illuminated slide -rule dial. Radio SARGENT-RAYMENT separate pre -wired and prealigned AM and Shack Corp., 730 Commonwealth Ave., Boston 17, Mass. User net price, $59.95. FM tuner circuitry on two printed circuit Stereo AM /FM Tuner and boards. Having separate FM and AM circuits. Control Ccntcr. FM tuner $39.95 A deluxe AM /FM tuner and control center, the Paco model ST -45PA can play simulcast the SR -8000 offers stereo as well as every feature which could separate AM or FM. A multi- be desired in an instrument of tiffs type. Sen- sitivity of 1.8 microvolts for 20 db quieting H. H. SCOTT on FM and 20 microvolts with ferrite loop on AM. Frequency response is +1 db, 20 to 20,- Wide -Band FM Tuner. The H. H. Scott 000 cps. Special steps reduce Model a taken to heat 314 Is new, moderately priced, FM are elimination of all power tubes and trans- tuner incorporating H. H. Scott's exclusive formers front the chassis (necessitating power wide -hand design. Sensitivity is 2.5 microvolts take -off front another unit or a separate power (111FM) with little distortion. The front end supply), and redesign of the front end so that a diode mixer takes the place of a tube. The { r 9 control center characteristics are exceeded plex socket: is provided with space beside it for a multiplex adapter. The FM tuner has a sensitivity of 2 microvolts for 30 db quiet- ing. Bandwidth is over 200 kc, with harmonic distortion less than 1% from 20 to 20,000 cps. The circuit includes dual limiters and a Foster -Seeley discriminator. The AM tuner has a tuned r.f. stage with n three -gang tun- ing capacitor. The built -in ferrite antenna is is silverplated and the chassis is copper rotatable as well as removable. The circuit in- bonded to aluminum in order to minimize cludes a 10 -kc whistle filter. Both AM and circuit losses and help maintain a high signal - FM sections have separate flywheel tuning, to -noise ratio. Detector and limiter bandwidth only by SR-2000 stereo preamp. sufficient are 2 megacycles. cathode -follower outputs and individual out - A multiplex output is pro- controls and functions being incorporated to put level controls. PACO Electronics Co., Inc.. vided. The 314 is designed to match the ap- satisfy the most sensitive ear. Distortion at 70-31 84th St., Glendale 27, L. I.. N. Y. User pearance of'H. H. Scott amplifiers such as 5 volts output is 0.5% intermodulation and net price, $99.95 for the kit; factory wired, the 222. An accessory knob kit is available 0.1% harmonic. Hum and noise, when oh- $134.95. to match the 299. H. H. Scott. Inc., 111 tafning power from SR -900 power supply or Powdermill Rd., Maynard, Mass. User net equal, is 75 db below 2 volts output on high price, $114.95. level input and 60 db below on phono chan- PILOT nel. Sargent- Ray-ment Co., 4926 East 12th Street, Oakland, Calif. User net price. $249.40. $0 -Watt Stereophonic Receiver. The Pilot SHELL model 602 combines on a compact chassis a SR- 10008, ster AM /FM tuner $184.50 sensitive FM tuner, a fine AM tuner, a 30- FM Tuner. A sensitive tuner with low hum watt stereophonic amplifier and a versatile level, the Shell series 800 "Hampton" is n SR -1020, FM tuner 97.50 control center. With the addition of speakers good value for the beginning enthusiast. FM SR -7000. ster AM /FM tuner, preamp 199.40

40 AUDIO AUGUST, 1960 41, Mass. User net price mahogany or birch $122.00 ; unfinished pine $109.00 ; walnut, AUDIO -TECH LOUDSPEAKERS cherry, or korina $128.00. Wide-Range Speaker System. Although ex- AR -1 full -range speaker system, mah $185.00 tremely compact, the Audio -Tech Model ME12 AND SYSTEMS AR -1W woofer only, mah 145.00 has a frequency range of 37 to 20.000 cps. AR -2 full -range speaker system, mah 96.00 Cobtaining a 12-in. woofer and a 3 -in. cone - AR -3 full -range speaker system, mah 216.00 type tweeter, it incorporates a special cali- ADVANCED ACOUSTICS AR -3st super-tweeter for ARI or brated level control for high- frequency bal- AR -2, mah 35.00 Ri- Phonic Coupler. Radically different for AR -3t mid -range & super -tweeter for a speaker system, the 440 lit- Phonic Coupler AR -I or AR -IW, mah 92.00 is claimed to be an extension of the ancient practices of design and construction. Musical instruments radiate ALTEC low frequencies directly from an unburned soundboard whose excursions are nowhere Economy Speaker System. The Monterey Jr. near the violent motion most speakers undergo is a compact moderately -priced system whose to produce those low noises. The Bi- Phonic quality of reproduction equals that of some Coupler emulates musical instruments by systems costing considerably more. A small using instead of a cone woofer a 15 x 22 inch ruggedly -built bass reflex enclosure houses an sturdy- wooden panel which is driven by a Altec 402A 8 -in. "controlled -linear-excursion" speaker and the newly -designed 2000A direct - radiator cone tweeter. Frequency range of the Monterey Jr. is stated by the manufac- turer to he 20 to 18.000 cps. and power rating is 15 watts. Impedance is 16 ohms. A single

ance. Colored binding posts permit easy de- termination of polarity for connection in stereo music systems. The speakers are fused to prevent damage from accidental overload. Enclosures are made from selected walnut. mahogany, and fruitwood, with a handsome hand- rubbed oil finish. Audio-Tech Labora- tories, 3420 Newkirk Ave., Brooklyn 3, N. Y. User net price, $109.50. JA -15 wide -range spkr sys $225.00

20 -pound magnet structure which is 7ttt- inches in diameter. Thus it can reproduce low Monterey Jr. is excellent for monophonic BOZAK notes with barely perceptible motion ; achiev- while make an ideal medium - listening, two a new, ing its maximum excursion instantaneously priced stereo system. It can be flush -mounted Small Speaker System. The Spinet. so that hangover notes are eliminated. Being in a wall or ceiling, or used in a console as an small speaker system has been introduced by unbatlled, the 440 produces a double -sided a system. Bozak to meet the needs of listeners who have integral part of music Dimensions a "Figure S" radiation pattern extending on are 1114"h x 23 "w x 11 % "d. User net price, it pronounced space problem. Measuring hoard. -inch depth x 23í,k x 111/2"d, has a both sides of the Its 42 in walnut, blond or mahogany, $79.50 ; unfin- compact 141/2"h "w it simplifies the installation problem and lends ished, $89.50. naturalness of response in bass. mid -range itself to unusual placement-such as on the and treble which is compatible with the larger ceiling, on a wall, or even on a room divider. 830A "Laguna" corner spkr system $599.00 High frequencies are reproduced by a polar 832A "Corona" corner spkr system 399.00 type, phenolic diaphragm tweeter. Frequency 833A "Verde" spkr system 309.00 response is stated to be from 30 cps to be- 605A Duplex 15" loudspeaker 177.00 yond audibility and power handling capa- bility 50 watts. Impedance 8 ohms. Available in mahogany, walnut, or oiled walnut. Ad- AUDAX vanced Acoustics Corp., 67 East Centre St., Nutley 10, N. J. User net price, $134.50. Multi- Speaker Systems. Designed by George Nelson, one of the country's leading furniture and industrial designers. the new Andes ACOUSTIC RESEARCH speaker series brings a distinctive blend of beauty and functionalism to component high Low -Cost "Acoustic -Suspension" Speaker fidelity. "The idea behind the Amiss speaker System with Super Tweeter. Selling for little systems was to make them interesting, excit- over a hundred dollars, the AR -2a consists of ing furniture pieces, beautiful in appearance an AR -2 speaker system in combination with as well as sound," Said Mr, Nelson. The a 1% inch dome -type super -tweeter. Audsx cabinets are finished on all four sides, The AR -2 speaker system uses the AR patented acoustic -suspension principle in which a small enclosure provides improved rather than compromised reproduction qual- ity. In this principle the woofer cone is mounted on very free suspensions, so com- pliant that they are unable to provide the elastic restoring force normally required of Bozak speaker systems. The Spinet is avail- them. The missing elasticity is then reintro- able in two models : the two -way B -500 sys- tem, and the three -way B-502 system. Both models utilize the sane finely- constructed, integrated components found in larger Bozak systems. and upon which the Bozak "Syste- matic Growth" idea is based. This latter en- ables users to start with a modest installa- tion, and then to "build" on it as they desire, without having to replace initial components. The Spinet is available finished in mahogany, blond, walnut, or ebony. or unfinished for those who wish to match the cabinet to an to be used as wall units or free standing. Each existing decor. R. T. Bozak Sales Company, model has detachable legs and a new type of Darien, Conn. User net price B -500, $147.50; speaker grille, n three -dimensional "acoustical B -502, $209.50. screen" which can be removed easily for cleaning. Model CA -80 contains two 8 -in. B -310A, wide -range spkr sys $770.00 extended -range speakers. Model CA -100 has 13-305, wide -range spkr sys (contempt 415.00 by duced by the pneumatic spring formed the two 10 -in. woofers, plus two cone tweeters. B -304, stereo spkr sys (contempt 620.00 air within the cabinet. The cone literally Both units are identical in external appear- B -302A, 3 -way spkr sys (contempt 249.50 rides on air instead of on mechanical springs. ance. Both are intended for bookshelf place- The small enclosure size is necessary for op- ment, and also may be used as floor units. timum performance. The 1% inch super - Both systems use Andes "Paraflex" speakers, tweeter uses a very small, stiff, hemispheri- is patented new design with many innova- BRADFORD calty shaped diaphragm as a direct radiator tions, giving a sound quality which is smooth which provides a nearly ideal performance in and natural. Andes, Inc., Division of Rek -O- Compact 11'idc -Range Speaker Enclosure. the high treble range. Kut Company, Inc., 38 -19 108th St Corona The Bradford enclosure, made in four sizes The AR -2a is a 4- speaker system consisting 68, N. Y. User net price for the CA -80 is for 8 -, 10 -, 12-, and 15 -in. speakers, is only con- of a single 10 -inch woofer, two 5 -inch tweet- $99.95 ; for the CA -100, $139.95. two inches larger than the speaker it ers, and the 1% inch super tweeter. Frequency tains. Its construction is based on a variable - response is more than adequate to cover the CA -60, compact 2 -way spkr sys $ 59.95 damping principle. in which speaker damping entire range of musical instruments. Cross- A -180W, 18" woofer 150.00 is varied automatically by a pressure relief over frequencies are 2000 cps and 7500 cps. A- 150 -X, 15" coaxial spkr 109.95 valve in the rear of the cabinet. Operation of Dimensions of the AR -2a are 131 "h x 111/2 "d A- 150 -W, 15" woofer 74.95 the valve is coordinated with cone excursion. x 24 "1. A- I20 -X. 12" coaxial spkr 69.95 In reality, it is an "acoustic spring" acting Recommended for use with amplifiers bay- A- 120 -W, 12" woofer 42.95 uniformly over the entire rear surface of the ing power output of 20 to 40 watts. Acoustic A -60 -M, 6" mid -range spkr 35.00 cone. Boominess and the effects of cabinet Research, Inc., 24 Thorndike St., Cambridge A -35-T, 31/2" tweeter 9.95 resonance are virtually eliminated. The Brad-

AUDIO AUGUST, 1960 41 ohms. The cabinet is completely factory con- structed ready to receive speakers and net- works. Available in walnut, mahogany. or un- finished birch. Electronic Instrument Co., 33 -00 Northern Blvd.. Long Island City 1, X. Y. Kit price HFS -3, malt $87.50; HFS -4, mai $98.50. HFS -2, Omni- directional spkr sys, mai. $139.95 HFS -5, 2 -way spkr sys, malt. kit 59.50 HFS -1, 2 -way spkr sys kit 39.95 ELECTRO -VOICE Thirty -Inch Woofer. This is the world's first mass- produced 30 -in. loudspeaker. Engineered expressly for use In the well -known EN "l'*- trician" 700. the Model 30W is also highly recommended for use in any custom installa- tion of exceptional quality. The speaker frame ford enclosure will enable the user to realize is a massive one -piece rigid casting which sup- the potential of most any speaker with which it is used. Bradford Audio Corp.. 27 E. 38 h St., New York 16. N. Y. Prices wide and 17- inches deep. Although these di- of the Brad- mensions were chosen ford enclosure range from $39.50 to $69.51), for the system's design depending on size and finish. function as a studio monitor, it works out very well in a home. Three speakers are used 4 -128 Spkr system, mat $525.00 in the column : a large elliptical cone woofer Baker's Ultra 12, 12" spkr 85.00 and two smaller units to cover mid- and high- frequencies. The axes of all speakers are verti- cal so that maximum horizontal dispersion is BTH achieved over n wide frequency range. Fre- quency- range of the system Is 30 to 15.000 18 -in. Dual- Channel Concentric Speaker. cps. An EMI 25 -watt. extremely low distor- Originally designed for motion picture tion amplifier is built into the base of the theatres, the AIOA speaker has found con- -column. Tlte- simplifier uses four adjustable. siderable favor for use in home systems. Built factory -set, frequency correcting networks to to commercial standards of performance it attain linear response over the required fre- compares favorably with current high -quail y quency range. The column Is mounted on four speakers designed for home use. large. concealed casters. Exclusive United The speaker is a coaxial type and features States distributor, Scope Electronics Corp., 10 separate magnets for woofer and tweeter. Columbus Circle, New York 19, N.Y. User net This is to ensure complete absence of electro- price, $594.00. magnetic intermodulation. (Large signal cur- rents in the woofer voice coil can modulate the field in the tweeter voice coil gap.) The FISHER woofer cone is curved and made of thick, soft paper Free- Piston Three-Speaker System. Utilizing so that it gives good performance up the to its design limit of 2000 cps (crossover is unsurpassed design of the Fisher XP -1, 1700 cps) and falls off rapidly above that the new XP-2 is even more compact and'easily frequency. out -performs many larger and higher -priced Its bass resonance Is 32 cps and speakers. power handling capacity is 20 watts. The It offers high compliance plus high tweeter born starts at the rear of the speaker, efficiency. and crut he used with amplifiers splits at the beginning of the woofer cone, rated as low as 10 watts. The unit contains and terminates in two equal sections about ports a true piston formation cone. The cone 34n. in itself is revolutionary, being a one -piece square which behave as two separate molding horns, giving excellent dispersion. It loads of polystyrene foam manufactured by effectively a newly -developed injection-forming process. down to 1200 cps which is well The below crossover. The crossover is supplied 30W Is capable of reproducing bass tones with the speaker. In the range of 18 cps with earth -shaking real- Frequency response of the ity. While these speaker is 30 -1500 cps. Manufactured in tones do not exist in pure England. form in commercially- recorded music, there are BTH speakers are distributed in the undertones and sub United States by Gramercy Sound Associates, -harmonics in this area 175 Fifth Ave., New which add distinctly to realism in reproduc- York 3, N .Y. tion. User net price, $139.00. Ultra -Compact Speaker System. Economy. EICO size. and performance combine to make the S -Way E -V "Layton" an excellent choice for stereo Speaker System Sciai -kits. The EICO systems HFS -3 and HFS -4 provide extraordinarily pure where space is at a premium. Fortu- reproduction nately this latest addition to the broad E -V of bass frequencies with good line efficiency in an enclosure of only 2a/; of ultra-compact systems performs way cubic beyond its minimal dimensions. Bass is two 8" woofers and one 5" tweeter, with a feet. Both are 3 -way systems consisting of a deliv- crossover network constructed of air -core 12" bellows-suspension woofer ered from a highly-compliant 12 -in. woofer and an S" with a coils and oil -filled capacitors. Over -all fre- closed back mid -range speaker with a high long-throw voice coil. Midrange and quency response high- frequencies are delivered by an 8 -inch is rated from 35 to 15,000 internal damping cone. A 3'A" cone tweeter cps. The cabinet, measuring 22" wide. 12" is supplied in the HFS -3 for those who prefer high, and 111/4" deep, Is constructed with softer highs; n compression- driver horn Interlocking Joints and shows no nails or tweeter is supplied in the HFS -4 for those screws. Fisher Radio Corporation. 21 -21 44th prefer more brilliance and projection in the Drive, Long Island City 1. N. Y. User net highs. (In all other respects. the HFS -3 and prices, unstained birch, $79.50: malt, wal, HFS -4 are Identical.) The impregnated cloth- cherry, $84.50 ($87.50 in Far West).' bellows woofer surround underlies the excel- lence of the bass reproduction. Built -in cross- XP -1. unf, $124,50, finished $129.50 over networks (600 and 4000 cps) with a level WS -1, aux spkrs for stereo 49.50 (pair) control provided for the tweeter. The en- closure is tuned to 25 cps by a tubular ducted port. The tuned enclosure loads the woofer and reduces cone excursion and distortion in FRAZIER the 28 to 60 cps region. Phase -coded terminals. Frequency range 28 to 14.000 cps. Power han- it Compact Two -Way Speaker System. The dling capacity 30 watts; rated impedance forte Carlo, the newest and smallest Frazier 16 two-way speaker system, is made to order for stereo. Measuring only 15Tí¢ "w x 10%"h x 11Ift'd. its size permits its use as a bookcase - ftadax speaker. All components are specially type speaker. and it is the most economical designed and matched to provide a level of of performanceperformance hardly expected from such a small all Frazier models for starting a stereo sys- Supplied in hand-rubbed hardwood ve- neers, it will add distinction to the most taste- ful surroundings. Available in walnut. ma- hogany, or limed oak. Electro-Voice. Inc., Buchanan, Mich. User net price, $84.50. Esquire 200, ultra -compact spkr sys $133.00 Regal 300, ultra -compact spkr sys 179.00 Royal 400, wide -range spkr sys 249.50 EMI Professional Studio Monitor Speaker System with Built -in Amplifier. Hand made and iden- tical with the systems used in the recording studios of EMI in England, DLS1 is a superb speaker system which will appeal to the con- 1, noisseur with unlimited budget and limited speace. Built high rather than wide, the DLS1 stands 50- inches high but Is only 13% inches

42 AUDIO AUGUST, 1960 tem. It employs a modified Helmholtz- radiator Halstead Ave., Mamaroneck, N. Y. User net principle, and has a frequency range from price, $69.50. below 70 to 15,000 cps. Power handling ca- pacity is 12 watts continuous. Tweeters are Axiette II $ 27.00 mounted for right and left placement for Triaxiom 212, 12 ", 25 -w 69.50 stereo. The cabinet is equipped with two con- Triaxiom 412, 12 ", 35 -w 92.50 cealed plastic feet and is finished in hand - Triaxiom 615, 15 ", 50 -w 147.00 rubbed natural walnut. The Monte Carlo is shipped two to the carton, matched for stereo. International Elyectronics Corporation, 2649 HARTLEY Rrenner Drive, Dallas, Tex. net price, $55.00. Compact Full -Range Speaker System. The Hartley "Capri" comprises a full-range 10" Dixielender, wide -range spkr sys $290.00 speaker mounted in a handsome natural wood Capri, wide -range spkr sys 150.00 cabinet which measures 24" w x 13 %" h Cortez, 2 -way spkr sys 140.00 Fiesta, 2 -way spkr sys 69.50 Del Mar, 2 spkr sys 89.50 Scala' Model LS -555. Using an air-core trans- Patio, wide -range spkr 50.50 former of special design to match the imped- ance of the speaker to the amplifier also helps match the enclosure to the room. The result GENERAL ELECTRIC is sound which is hard to believe from such a small speaker. The cabinet is a modest 9 x 9 x G -F. Two-Way Speaker system. Engineered 16 inches and is handsomely styled of genuine or high -quality sound reproduction in a lim- hardwoods- walnut, mahogany, or blond -and ited space. the Model G -501 is a compact matching grille cloth. Frequency response is speaker system by General Electric's audio stated to be 50 to 15,000 cps. Power handling components section. Termed a "stereocompact" capability is 10 watts at an efficiency of 7 %. Impedance 4 ohms. I.H. Mfg. Co., Inc., 121 Greene Street, New York 12, N.Y. User net price, $34.95. x 12" (1. The grill is made of bamboo, adding a note of distinction to the appearance. The MS -555 "Minstrel" spkr sys $29.95 driver is the new model 320 which is n paper polymerized adaptation of the model 2 20 chemical cone speaker. It has a 15,000 -line ISOPHON voice magnet, 8 -ohm coil, one -piece molded Six -speaker Midrange and Tweeter Combina- flannel surround, large dome high- frequency tion. Manufactured in Western Germany by propagator attached to the aluminum shorted - of a leading manufacturer of speakers, the HIC turn portion coil, which is in 6 -8 is ideal for stereo systems using a single turn damped and separated from the wound woofer and two separate high- frequency speak- portion of the coil by a polysiloxane coating. ready for installation Hartley Products Company, Inc.. 521 E. 162nd ers. It conies complete, in the home with a kandsome six -sided. non - St., New York 51, N. Y. User net price, resonant enclosure which houses six 3tß -in. $120.00. Holton Jr.. wide -range spkr sys $195.00 system, the G -501 will deliver excellent audio Duo, complete stereo spkr sys 280.00 performance, yet is only 22 "w x 13 "h x 9 "d, tine bookshelf dimensions. The new unit is based on GE's extended -bass design, and has a HEATH woofer, tweeter, and electrical crossover net- work all housed in a dramatically styled en- Wide -Range Speaker System Kit. Taking a closure. The G -501 presents a departure from cue from the motion picture theater, the Heath previous G -E speaker systems, blending rich "Legato" kit (model HH -1) features thea- wood finishes, new grill patterns, and greater ter -type sound reproducers to produce the use of metal trim. Lser net price, $85.00. ultimate in listening realism. The system, a modified infinite baffle, uses two 15" Altec Al -401, 12" coaxial spkr $49.95 low- frequency drivers to cover frequencies Al -403, 12" woofer 32.95 Al -404, tweeter 18.95 1201A, 12" wide -range spkr 24.95 85013, 8" wide -range spkr 10.95 LC -12, 12" extended bass coaxial spkr 89.95

GOODMANS speakers and a crossover network. Placement of the speakers, one on each of the six faces, Super -quality 8 -in. Speaker. The Axiom 80 assures an extremely wide sound dispersion. (shown) is capable of the highest accuracy In effect, the sound pattern will be almost of sound reproduction at medium power levels. hemispherical in shape. Power handling ca- It has an audio range of 20 to 20,000 cps and pacity of a single HK 6.8 is 18 watts and the a power handling capacity of 12 watts. Flux frequency response is 350 to 17.000 cps. density is 17,000 gauss. The low- frequency Matches transformers with 4-6, 10-15, or 800 - diaphragm of the Axi,aa yu is a true "free- ohm impedances. Isopbon Speaker Division, Arnhold Ceramics, Inc., 1 E. 57th St., New York 22, N. Y. User net price, $59.85. IV-25. 3 -way, 4-spkr sys (25 -w) $198.50 IV-20, 3 -way, 4-spkr sys (20 -w) 169.50 JANSZEN Wide -Range Speaker System. The Z -400, an from 25 to 500 cps and a specially designed inexpensive wide-range speaker system, marks sectoral exponential horn with high-frequency the first time that the well -known JansZen driver to cover frequencies from 500 to 20.000 electrostatic tweeter has been available in a cps. Perfect sound balance is attained by compact, shelf -mounted enclosure. In the Z -400 proper phasing of the high- and low -fre- quency drivers and using a well designed cross- over network. Precisely determining the cor- rect amount of phase shift permits transition to the high frequencies so smoothly that it cannot be measured. Power handling capacity of the system is 50 watts voice -coil im- pedance is 16 ohms. Internal reflections are absorbed by the splayed back panel and a 3" lining of fiberglass. The African Ma- hogany enclosure emphasizes simplicity of line and form to blend with either modern or tra- ditional settings. Heath Company, Benton Harbor, Mich. User net price, $299.95. AS -2U. acoustic suspension spkr sys edge" suspension, being suspended by three kit, mah $79.95 pairs of double- acting cantilevels to produce SS -2, basic range spkr sys kit 39.95 an extremely low and linear axial stiffness SS -1B, range extending, spkr sys kit 99.95 and a powerful radial centering action. Reso- US -4, 8" dual cone spr 6.95 nance is 20 cps. Ideal for monitoring applica- US -1, 12" spkr 7.50 tions. New Triaxiom serles consists of dual - US -2, 12" dual cone spkr 11.95 cone low- frequency units with aluminum-dia- US -3, 12" coaxial spkr 19.95 phragm high -frequency pressure drivers. Three 12" models range from 25 to 45 watts: the JansZen is acoustically paired with the three 15" models from 30 to 50 watts. Axiette I.H. MFG. Model 350 11 -in. dynamic woofer. The high - II is economically priced 8" unit covering compliance cone of the 350 is specially treated range from 40 to 15,000 cps and capable of Air Coupled Speaker System. Economy and to provide low -frequency reproduction which handling 12 watts. Rockbar Corporation, 650 performance are main features of the LH. "La perfectly complements the JansZen tweeter.

AUDIO AUGUST, 1960 43 The Z -400 is stated to cover the range from 30 to beyond 30,000 cps with exceptional uni- KLH formity and low distortion. Tweeter and woofer are integrally mounted In a totally - Full-Range Two -Way Speaker System. enclosed Fibreglas -filled enclosure which may Housed in a cabinet measuring 24 %" h be placed vertically or horizontally as desired. x21" wx11 %" d and supported 11/2" A built -In power supply and high -pass filter above the floor by runners, the volume of the furnish power for the two push -pull electro- Model 7 is 2.6 cu. ft. The speaker comple- static elements, and eliminate the need for ment is a 12" acoustic suspension woofer and external crossover networks and attenuators. The Z -400 measures 15 "h x 26 "w x 13 %"d, and is available in walnut, mahogany and birch finishes. Neshaminy Electronic Corporation. Neshaminy, Pa. User net price. $199.50. Z -300, wide -range spkr sys, mai, $149.75 130, electrostatic mid -range, tweeter 184.00 65, electrostatic tweeter, mall 89.50 350, 11" woofer 44.50 JENSEN "Satellite" Stereo Speaker System. The new Lafayette "Elliptoflex" speaker system is a ensen "Galaxy III" speaker system achieves high - efficiency system ut dining a high-com- wide panoramic stereo sound with two tiny pliance speaker for Improved low -frequency satellites and a single bookshelf size unit. The response. The "I:lliptotiex" enclosure achieves latter, called the "bass center" speaker, may its high efficiency because of the elliptical port be on floor or shelf wherever and a triangular-shaped diffracting ring placed convent- mounted on the front of the bailie board. These features tend to broaden the frequency response, improve transient response, and create a "lens" effect, changing relative par- ticle veloci ties -and, consequently- phase rela- tionships-so as to produce at smooth transi- tion from front to rear radiation. These engi- neering advances are coupled with the La- two small cone -type direct radiators operating fayette free edge SK -5S 12" coaxial speaker as rigid pistons over the range from 1500 to with 3" cone tweeter, 114 pound magnet, and special %" wide sheepskin suspension, and l 20,000 cps. The use of two such loudspeakers a built -In crossover -network level control. The gives surprisingly large apparent sound "Eliptoflex" speaker system is finished on four source. Low- and high -frequency sections are sides in a variety of hardwood veneers for at- coupled by an LC crossover network at a fre- tractive room placement either horizontally or quency of 1500 cps. The relative levels of vertically. Lafayette Electronics Mfg. Corp., low- and high- frequency sections may be 104 -46 Dunkirk St., Jamaica 12, N.Y. User net varied ± 2% db to provide some degree of control over different room acoustics. Cabinet price, $64.50. shape chosen to fit decors where the longer SV -343, spkr sys $39.50 rectangle shape of the Model Six might not SK -131, super tweeter 19.50 ence and decor dictate. Finish on all four sides lit. Efficiency is identical with that of Model SK -58, 12" coax spkr 29.50 allows vertical or horizontal positioning. The Six. KLH Research and Development Corp., SK- 133.12" woofer 25.50 Jensen "Flexair" 12-inch high -compliance :t0 Cross St.. Cambridge, Mass. User net woofer has unusually low resonance and is prices: mah, korina, $196.00 ; wal, oiled wal, capable of total motion of 1 -inch, providing $203.00; tint wal, $198.00; unf birch, $189.00. JBL clean bass as low as 20 cps. The small satel- lite unita handle midrange and high frequen- Model ONE, 2 wfrs, mah, $378.00; wal. $390.00 " Minigon" Stereo Speaker System. E 'olved cies. Their placement is not critical as long Model SIX, 1 wfr, 1 twtr; wal 129.00 from the well -known JBL -Ranger Paragon, the as they are placed to the left and right of JBL- Ranger Minigon gives full stereo 'cover- the center unit. They may be spaced as much age through the patented radial refrnctidn sys- as 20 feet apart and still provide stereo sound KNIGHT tem. Modest in size, the Minigon is not a with excellent spatial center-fill. The Galaxy 19 -inch Wide Range Speaker. This unusually simple miniaturization of the larger JBL - III system provides the equivalent of two rugged model KN- Itanger systems. It has been designed specifi- complete 3 -way speaker systems with speaker, 600HC, incorpo- the rates several refinements which provide per - added feature of a "derived third channel" for formance of the highest calibre. In addition to eliminating the "hole -in- the -middle" effect. the massive, one-piece, cast alloy frame, this Frequency range of the complete system is 20 cps to beyond audibility and power rating Is speaker features a ' -inch thick polystyrene 30 woofer cone which achieves a free air reso- watts. Jensen Manufacturing Company, nance of 25 cps with a power handling capac- 6601 S. Laramie Ave., Chicago 38. User net ity of 50 watts. cone is woven price,price, $229.50. Available unfinished at The suspension

Galaxy II, stereo spkr sys $169.50 catty to function with the JBL "Lineal' Effi- TR -30, 3 -way spkr sys 11930 ciency" speaker systems which require keeled TF -3, 3 -way spkr sys 79.50 enclosures. All joints are lock -mitred, I wood DF -1, 2 -way spkr sys 69.50 welded and carefully tested for air leak S. The complete Minigon installation cons'sts df two cabinets with mirror-image symmetry The KLIPSCH cabinets are finished on all four sides se that either can be used as a left or right. Lnrk but 9 -Way Speaker System. Th^ ('n-nu-all not least. is the unusually attractive a menr- speaker system, engineered by the creator of nnce of the Minigon. James B. Lansing Sound. the famous Klipschorn corner horn system, is Inc.. Los Angeles 39. Calif. User net 'price, designed to integrate with the Klipschorn to $249.00 each with LElO woofer, LE30 t eeter form a wide stage stereo system. The Corn- and LX3 dividing network. wall' is useful in combination with one large corner horn in a stereo set -up where a second corner is not available. Ideally, however, it is MADISON FIELDING Economical Bookshelf Speaker System. On a par with speakers costing two to three times as much. the Troubadour is ideal for udget systems or as a supplementary speaker. Only 9" high by 9" deep and 14" w:de. the Trou- and silicone impregnated to insure high coin - plinlice. Speaker loading and type "f enclo- sure are not critical will this speaker thus affording a high degree of flexibility. The axially mounted, compression type tweeter. terminates in a rectangular diffraction horn which distributes the highs over a wide area. An electronic crossover network is built in and includes a brilliance control on an 36 -inch cable to adjust the tweeter for varying room acoustics. The precision, aluminum- ribbon voice coil has an impedance of 8 ohms. The ceramic woofer magnet weighs 4.6 pounds. Over -all fre- quency response is 25 to 15.000 cps. Allied Radio Corporation. 100 N. Western Ave., Chi- cago S0, III. l'ser net price. 6.1.50 approx. KN -810A 18 ". 3 -way spkr, 25 watts ... $54.95 used with two corner horns as the middle KN -815A 15 ", 3 -way spkr, 50 watts ... 89.95 badour offers amazingly clean reprod>iction channel in a three -speaker stereo system using KN -850 12 ", 3 -way spkr, 50 watts 69.50 with distinct lows starting at 50 cps to highs either independent or derived center channel. .... up to 15.000 cps. The special acoustical y de- The Cornwall is a 7 -cubic -foot enclosure hous- signed enclosure provides excellent lote -fre- ing the same driver units -bass, midrange, and LAFAYETTE quency damping. Impedance is 8 ohms. Brand tweeter, as the Klipschorn and affords smooth Products. Inc., 256 E. 49th St.. New York 17. effortless bass down to 35 cps. Klipsch and Bookshelf Speaker System. Featuring a N.Y. Available in walnut, mahogany, or ebony. Associates, Inc., Hope, Arkansas. unique enclosure (patent applied for), the User net price, $29.95.

44 AUDIO AUGUST, 960 from McIntosh ... the finest performance available the Mac Kit A 30 -Watt Unity Coupled Amplifier Kit*

1;

*Identical to the renowned McIntosh MC-30 Amplifier Price $120 Enjoy the wonderful experience and satisfaction of putting the finest amplifier together yourself.

A "Mark of Excellence" Product by McIntosh LABORATORY, INC. 4 Chambers St., Binghamton, N. Y. Now available at Franchised McIntosh Dealers

AUDIO AUGUST, 1960 45 unfinished or walnut finish. Paco Electronics Company, 70 -31 84 St. Glendale 27, Long Island, N. Y. Used net price, $59.95 unfinished, $69.95 walnut finish. NEAT PILOT QUAD 2 -Way Speaker System. Unusual speaker Compact, 3-Way, Wide -Range Speaker Sys- Full-Range Electrostatic Speaker. Perhaps system combining an electrostatic two -element tem. Exceptional bass response and realism the first full -range electrostatic speaker n the tweeter with an 8 -inch cone type woofer. The are featured in the Pilot PSV -1 "bookshelf" world, this speaker may herald the future for Neat NE -20 system has a frequency range of speaker system. It achieves extremely wide the industry. Completely free standing and 35 to 20,000 cps and power handling capabil- sound dispersion in horizontal or vertical po- non -critical as to placement, it radiates from ity of 8 watts. Has built -in crossover network sitions by means of Pilot's "Acoustimatic both sides in a figure-eight pattern which (crossover frequency 5000 cps) and a 117 -volt Turret," an array of tweeters and midrange minimizes reflections from the walls and ceil- a.c. power supply for the tweeter. Neat Onkyo speakers that can be oriented from outside the ing. Frequency range of the speaker is 45 to Denki Co.. Ltd. No. 4. 1- chome, Kanda Hata- cabinet. Solid bass is achieved by a 12" Air- 18,000 cps and its impedance is 16 ohms. Di- gocho, Chiyodn -ku, Tokyo, Japan. mensions are 31" high, 341/2" wide, 101,fi". deep at bottom. Manufactured in England, exclusive United States distributor is Lectronics of City NORELCO Line Center, 7644 City Line Ave., Philadelphia 31, Pa. User net price. $345.00. Speaker Series. Illustrated is Model AD- 5277M, the most powerful in the new T-7 series of twin -cone speakers manufactured by Philips R & A of The Netherlands, and featuring Ticonal 7, a high- coercivity alloy which provides the Coaxial Speaker Series. Manufactured by a highest possible concentration of flux densities well -known British speaker manufacturer, the in the voice -coil air gap. Weight for weight, 700 series Mark III models are a group of Tlconal 7 is said to be about 30 per cent high quality woofer/midrange speakers. Al- more powerful than any of the conventional though they vary in fundamental resonance magnet materials used in speaker construction. (80, 05, 60 cps respectively for the 8 -, 10 -, and Voice -coil impedance of the new T -7 speakers 12 -inch speakers) they all provide smooth fre - is held constant throughout the entire fre- quency response up to 10.000 cps. All feature quency range by means of a copper ring fitted Alcomax III Anisotropie magnet systems with a flux density of 12.000 gauss. The magnet assembly is easily removable without demag-

Flex heavy duty woofer in an Orlon fiber filled enclosure. Two 3" tweeters and two 6" midrange units have been angled for wide horizontal sound distribution. Frequency range of the system is 40 to 16,000 cps. Built -in crossover network crossover frequencies 800 and 8000 cps. Finished on all four sides in a choice of hand-rubbed mahogany or walnut. Pilot Radio Corporation, 37-06, 36th Street, Long Island City 1, N. Y. User net price, $139.50. PSV -2, 3 -way spkr sys $69.50 PSV -3, 3 -way spkr sys 64.50 POLYCOUSTIC Small -Speaker -Array Wide-Range Speaker System Kit. Perhaps the first speaker system using the small- speaker -array principle. the Polycoustic PC-28K kit uses n large number into the air gap. The ring acts as a shorted of small speakers in series -parallel array. The turn which induces a current opposite in po- array consists of 22 selected six -inch speakers netization and has zero external field. Power larity to that flowing through the voice coil, and 6 three -inch hard -cone tweeters. The handling capacity is 15, 20 and 25 watts which reduces that current thereby lowering speakers are arranged to use all of the avail- respectively for Model 780 (8 "), Model 7100 the Impedance to its proper level. The resonant able front panel surface. Thus over 75% of (10"), and Model 7120 (12 ") speakers. Voice - frequency of the T -7 speakers is very low, the cabinet is a radiating piston. Low distor- coil impedance is 8 ohms for all models. Dis- resulting in an extremely straight response tributad in the United States by Ercona Cor- curve in the bass region. In addition to the r - ._ poration, 16 W. 46th St., New York 36, N. Y. cone for low and middle notes, the speakers User net price. Model 780 $13.95, Model 7110 are equipped with a high -note cone which ex- $15.95, Model 7120 $17.95. tends the upper frequency range. Model AD- 5277M is a 12 -in. speaker with a frequency range of 35 to 18,000 cps and 20 -watt con- REALISTIC tinuous power handling capacity when prop - erly housed. Cone resonance is 35 cps. High Low -Coat Speaker System. The Rea istic Fidelity Products Division. North American "Trio" is an impressive performing 3- speaker Inc., Hicksville, N. Y. User system which compares well with similar sys- Philips Company, tems costing considerably more. The Trio en- net price, $72.50. closure has a laminated mahogany finish on 1 Integrated spkr sys $150 -160 all four sides, permitting horizontal or vertical 2 End for 8" spkrs 50-60 placement in any desired location. The two 3 End for 8" spkrs 31 -35 tweeters are mounted on a separate inner mounting board which can be rotated 90 de- grees to permit full dispersion regardless of PACO the position in which the speaker is used: The 8 -in. woofer is equipped with a center -mounted P -Way Semi -Kit Speaker System. A compact acoustic cut -off filter to yield cleaner lows. A 2 -way speaker system, the Model L-2 kit fea- tion is achieved because each speaker Handles dual high -pass filter network gives smooth tures a factory -built and -finished cabinet only 1 /28th of the audio load so the cone crossover, with over -all frequency range of 35 crafted of furniture -grade plywood. The inte- excursion is exceedingly small even for bass to 17,000 cps. A pair of Trios is ideal for a grated system incorporates a special design notes as low as 30 cps. High-frequency disper- stereo music system. Radio Shack Corporation, 10 -inch Jensen long -excursion woofer and a sion is 180 deg. at 5000 cps, 120 deg. at 10,000 730 Commonwealth Ave., Boston 17, Mass. born-loaded compression tweeter. Low -fre- cps. Over -all frequency range Is 30 to 15,000 User net price, $39.95. quency response is extended by a pre -tuned, cps. power handling capability 25 watts, im- tube-loaded port. Frequency range is stated at pedance Polycoustic Solo-I, 2 -way spkr sys $15.95 45 to 14,000 cps. Impedance is 8 ohms. The Aguello Drive, San Leandro, CalfCalifornia. User Solo -II, full -range spkr sys, mah 29.50 compact cabinet, 23" x 13" x 12 ", is available, net price, $176.31 (f.o.b. San Leandro). Electrostat-3, electrostatic spkr 27.50

46 AUDIO AUGUST, 19601 This is the only common sense when you buy a speaker system!

THE KNOWLEDGEABLE audio -hobbyist tiently, for months if necessary, for people who enjoy the emotional ex- demands that the components of his his Wharfedale speaker. perience of music are buying high sound system achieve the reproduction Now, for this man and for those who fidelity components. It is unfortunate of music which most closely represents may profit by his special knowledge, that competitive advertising claims - his personal approach to perfection. sound judgment and good advice, even though justified-far from being He makes his choice of a speaker by England's G. A. Briggs has created the a helpful guide to selection, often offer one common sense -the sense of hear- great new Wharfedale '60, the first full a bewildering barrier to making an in- ing -the one sensible way to evaluate range shelf -size speaker system which telligent choice. But, of this you may the tonal qualities of a speaker. Yes, incorporates the sand -filled principle. be sure. The one way to buy a speaker he buys by ear, by listening, by com- Its compactness has been achieved system is to listen with your own ears. paring to determine the sound of music without a degree of compromise. The If the sound pleases you, it is the which is most natural, most satisfying. Wharfedale '60 brings you rich, non - world's best for you. His final selection is based upon a strident high notes without electronic, And, no one can satisfactorily evalu- deeply personal judgment of the mechanical or acoustical tonal colora- ate the characteristics of the speaker speaker which offers the greatest tion. The sand -filled panel, coupled which will please you most by employ- listening joy. with specifically designed speakers ing any visual device which purports Because of its magnificent musical matched to each other and tuned to to measure sound performance. We values the audio-hobbyist maintains perform perfectly within the enclosure feel sure that your high fidelity dealer an inflexible preference for Wharfe- permits a full, rich, glowing bass com- will advise you not to invest in any dale. The name Wharfedale to him is pletely free from any suggestion of speaker system which may provide synonymous with the world's finest false resonances. This is why, of all you with less listening pleasure until speaker systems. When he purchases a shelf -type speaker systems, the you have heard the sound of the new speaker system he does not desire, Wharfedale '60, in our sincere opin- Wharfedale '60. With the creation of and cannot be sold, any speaker sys- ion, is the speaker system which the decorator designed Wharfedale '60 tem except a Wharfedale. And, when achieves the closest approach to the the commonplace look of ordinary the demand for Wharfedale speakers perfect recreation of the live perform- stereo systems has been replaced by exceeds the supply, he will wait pa- ance of music. Today, a great many the perfect proportion of beauty.

The Wharfedale '60 exclusive sand -filled panel gives optimum results with boss frequencies. It consists of two layers of wood with a completely inert filler of dry sand between them to permit cleaner, truer bass down to 20 cycles.

The compact enclosure offers performance generally ascribed to on infinite baffle plus metered pre -bal- anced wave pressure releose. Finished on four sides. Will perform excellently vertically or horizontally.

NO GENLI LIMED OAK. IS PRICED AT 510990

Note: A new Wharfedale "chairside" equipment cabinet has been coordinated in styl- ing with lie Wharfedale '60 Speaker System. The "chair - side" cabinet holds your entire stereo system...your record changer, tuner, preamplifier For illustrated brochure write Dept. and amp fier. Priced at WKIU $109.50. Wharfedale Division, British Industries Corp., /'art Washington, N.Y. two type 25 woofers and two type 23K tweeter adjustable to 4, 8, or 16 ohms. Crossover net- RFL assemblies. Each enclosure can be considered work is included with speaker. Tannoy (Amer- Dual -Channel, Single- Cabinet Speaker Sys- to be two separate cabinets coupled by means ica) Ltd.. Box 177, East Norwich, N. Y.' User tems. "Special Fidelity" line of the APS network. The rear of the mechani- net price. $112.75. of single cabinet cal driver actuates the air mass in the first speaker systems for stereo or monophonic 15" Monitor systems. The line chamber which in turn serves as the excitation Dual Concentric with consists of six- decorator- for the APS network. The output of the net- crossover $179.00 styled models with designs by Petruccelli and work 12 "Monitor Dual Drake-Smith. Unlike multiple cabinet stereo drives the second chamber. Outputs of Concentric with systems, these single -cabinet systems are both chambers are additive. Output of the crossover 138.00 non- acoustical chamber is coupled to the air pass 12" Direct Radiator 79.00 critical as to location and eliminate the "hole - of the in- the -middle" effect. The deluxe series listening room by means of four slots. 12" woofer 78.75 incor- each slot separated by 90 degrees. The APS 15" woofer 123.75 porates the Provincial, the Classic, the network Contemporary (illustrated) and the improves both low -frequency and tran- Tweeter 86.00 Colonial. sient responses. The type 231. tweeter assem- blies match the rest of the system in appear- ance and have a frequency response of 2000 to 18,000 cps ±2 db. Total system response is UNIVERSITY 20 to 20,000 cps within 8 db and power han- dling capability is 3G watts. Impedance 4 Medallion XII Speaker system. Featuring ohms. Sonograf Electric Co.. 37 East 28th St.. an unusual "Select -A- Style" furniture concept New York 10, N. Y. wherein Interchangeable speaker grilles to match Provincial. Modern and Contemporary furnishings are optional. Relatively compact STENTORIAN for a designer- accent cabinet (24" H x 17" W 12 -inch Extended -flange Speaker. Excellent performance is the key feature in this high - fidelity speaker manufactured by Whitely Electrical Radio Company In England. Tile model HF1214 has a frequency range of 25 to 14,000 cps with a cone resonance of 39 cps.

The low -boy Suburban and the compact Metro - politan round out the line. Radio Frequency Laboratories, Inc., Audio Products Div.. Boon- ton. N. J. Used net price: Provincial (plati- num-walnut or fruitwood) $795, Classic (ma- hogany) $765. Contemporary (walnut) $735, Colonial (pine) $630. Suburban (walnut or brown mahogany) $375, Metropolitan (walnut or two -tone) 8225.

RJ RJ /Wharfedale Speaker System. Combining the RJ /8 enclosure with the Wharfedale Super 8 /FS /Al. speaker, this compact assembly is ideally suited for stereo music systems. The RJ enclosure. when it was introduced six x 121" D), the Medallion XII is well sititee. years ago, established an entire class of prod- for stereophonic speaker arrays. The 3 -way ucts. The RJ is distinguished from all other speaker system includes n 12" high- compliance small -size speaker enclosures by a unique in- woofer with a long -throw voice coil ; an 8" midrange speaker ; and the Sphericon super - tweeter. Frequency response is linear front 28 to 22.000 cps. Includes controls for adjusting The 13. -inch diameter voice coil is driven by system to room acoustics. User net price a 51/2 poundpound Alcomax magnet structure with (cabinet only), $139.95. "Select -A- Style" a flux of 14,000 gauss. Power handling frames, $9.95- 14.95. capacity is 15 watts and voice-coil impedance 3 -11'ag 12 -in. Diffaxial Speaker. This is the is 10 ohms. The patented Stentorian cambric most elaborate of University's series 200 cote is used. and the speaker Is mounted on speakers. An excellent performer, the model an unusually sturdy die -cast. non- resonant 312 features a sturdy die -cast basket and a frame. Distributed in the United States by center mounted Sphericon super-tweeter which Barker Sales Co., 339 Broad Ave., Ridgefield, incorporates its own reflector baffle to prevent N. J. User net price, $52.50. interaction between tweeter and woofer. It ternal design, which is covered by two U.S. HFI012U, 10" spkr $18.95 also provides 120 -deg. dispersion in all direc- patents. Basically, the RJ enclosure gives un- HF8I2U, spkr tions. Midrange is provided by the multi- distorted bass notes 8" 14.95 element Diffusicone without compromise be- T -359. 31/2" tweeter 14.95 that achieves uniform cause of size. The RJ /Wharfedale will fit T -10, tweeter handily into a single shelf of a bookcase. 20.95 Dimensions are 11" h x 231,6" w x 10" d. EJ Audio Products. Inc.. 80 Shore Road. Port TANNOY Washington, N. Y. Used net price. in un- finished birch hardwood, $50.50: in mahogany, 10 -inch Dual- Concentric Speaker. Designed walnut, or blond finish, $59.50. specifically for home systems where space Is n problem, the Tannoy Dual- Concentric III LZ R1 8, enclosure for 8" spkrs, mai $37.50 can be RJ 12 -S, enclosure for 12" spkrs, mah 49.50 "infinite bate mounted' 'in enclosures with a volume as small as 13,4 Rl 15. enclosure for 15" spkrs, mai, cubic feet. Like 56.00 all Tannoy dual- concentrics the III L7, incor- porates two completely separate speakers, a SONOGRAF Wide- Dispersion Speaker System. Manufac- tured in Norway with typical Scandinavian feeling for wood, the Sonograf Model 253 -SS Is an unusually handsome speaker system featuring an almost uniform radiation pattern over 360 deg. The complete system consists of two C25 APS (acoustic phase shift) cabinets,

dispersion in the 1000 -3000 cps range. Built - in adjustable "brilliance" control. Frequency range stated as 28 to 40,000 cps. Power han- dling capacity 35 watts, impedance 8-10 ohms. University Loudspeakers, Inc.. 80 S. Kensico horn -loaded tweeter and a direct radiator Ave.. White Plains, N. Y. User net price, woofer. The low leakage magnet assembly uses $73.00. the patented Tannoy "magnetic shunt,' one I of the notable developments in speaker design 6201, 12" coaxial spkr $57.75 within the last ten years. By the use of this Diffusicone -12, 12" Diffaxial 39.75 device, magnetic losses are reduced consider- Model 308, 8" 3 -way Diffaxial 42.00 ably, with resultant smoother response, better Diffusicone -8, 8" extended range 28.00 damping, improved transient response, and UC -153, 15" 3 -way Diffaxial 83.00 higher efficiency. The tweeter has a light alloy UC -152, 15" 2 -way Diffaxial 45.00 diaphragm working in conjunction with a UC -i23, 12" 3 -way Diffaxial 66.50 precision phase -matching throat. The woofer UC -122, 12" 2 -way Diffaxial 35.50 has a curved cone, a plastic surround, and a UC -I21, 12" extended range 28.00 resonant frequency of 27 cps. Power handling UC -82, 8" wide -range 16.95 capacity is 20 watts and the impedance is T202. Sphericon super- tweeter 24.95

48 AUDIO AUGUST, 1960 STEREO SYSTEM FOR A MILLION- AIRE: 4 SELECTIONS Gentlemen's Quarterly magazine asked James Lyons, editor of The American Record Guide (the oldest record review magazine in the United States), to poll hi -fi authorities on which audio components they would choose for the best possible stereo system, without any regard for price. Three writers in the audio field and one audio consul- tant made up independent lists. The ideal systems they projected in the April, 1960 issue of Gentlemen's Quarterly are suitable for discriminating millionaires-one of the systems, using a professional tape machine, would cost about $4000.

ACOUSTIC RESEARCH AR -3 loudspeakers are included in three of the lists,* and these are moderate in price. (There are many speaker systems that currently sell for more than three times the AR -3's $216.) AR speakers were chosen entirely on account of their musically natural quality. Literature on Acoustic Research speaker systems is available for the asking.

`In two cases alternates are also listed. For the complete component lists see the April, 1960 Gentlemen's Quarterly, or write us.

ACOUSTIC RESEARCH, INC. 24 Thorndike Street Cambridge 41, Massachusetts

AUDIO AUGUST, 1960 49 VITAVOX provided with double muting switch and an R/C network to give absolute silence during Halhnark Speaker System. Built by Vitavox, change cycle. Unit plays 7 ", 10 ", and 12" Ltd.. of London, the new Hallmark speaker records in any order. Arm has removable systems are based on a unique enclosure de- pickup head with 5 -pin plug to accommodate sign, and incorporate the Vitavox DU120 nil standard stereo and mono cartridges. Di- duplex -coaxial full -range speaker. Nominal fre- mensions : 12" 13 ". 5" above motor board quency range of the units is 30 to 15.000 cps and English power 'rating is 15 watts. A built -in control affords adjustment of the bal- ance between bass and treble. The graceful

woofer has a fundamental free air resonance of 25 cps and utilizes an extra heavy cone which provides excellent transient response and freedom from breakup. It has a 9%-lb. magnet assembly and a resin -impregnated fabric surround. The 5" tweeter is sealed in a compartment isolated from the woofer. Both speakers have rigid die -cast chassis. Power handling capacity of the system is 30 watts and 2%" below. Itockbar Corporat.un, 650 and impedance is 8 ohms. Crossover network Halstead Ave.. M uunroneck. N. Y. Use:* net and precision wire -wound treble control are price, less cartridge, $80.30; Willa Shure built -in. Available in walnut (oiled or pol- M7D, $83.50. ished), mahogany, limed oak, or unfinished birch. British Industries Corp.. 80 Shore Road, 4171203 trans turntable $49.50 Port Washington, N. Y. User net price (fin- TSC -740 changar 42.50 ished), $109.50. TP -59, man rec player 29.95 SF8 /3 Deluxe, 3 -way spkr sys $279.00 Coaxial 12, 12" dual concentric spkr 139.50 DUAL Super 12 /FS/AL, wide -range 12" spkr . 89.50 appearance of the enclosures, which serves to W/10 /FSB, wide -range 10" spkr 47.50 Deluxe Changer- Turntable. The United Au- enhance the decor of any room, conceals the Super 8 /FS /AL, wide -range 8" spkr 26.50 dio DUAL -1006 is a precision -built machine in detailed technical features of the interiors Super 3, 3" tweeter 26.50 all respects. It will track and operate auto - which are acoustically designed to ensure ex- W12 /FS, 12" woofer 52.50 matically with stylus force as low as 1.5 cellent results from cabinets of moderate di- W15/FS, 15" woofer 89.50 grams. Operating at all four standard speeds. mension. Hallmark speaker systems are avail- it incorporates a motor of unusually high able in Lowboy (illustrated) and Tallboy mod- power, assuring constancy of speed under any els in a wide range of finishes. Distributed WIGO normal load condition. Field coils are tropical - exclusively in the United States by Ercoua ized, and thorough shielding prevents hum. Corporation, 16 W. 46th St.. New York 36, Coaxial Speaker. The new \Vigo line of high - The lightweight tone arm is of one -piece con- N. Y. User net price, $199.50. fidelity speakers was devised to eliminate struction and is equipped to accommodate in- technical overlap and duplication while re- terchangeable cartridge by means of a locking - DU -120, 12" coax spkr $89.50 taining complete compatibility between the key snap -in arrangement. Direct set of ball various components offered. Model CX212, il- lustrated, is a factory-assembled coaxial system WEATHERS comprising the Model ERD -12 extended -range TriPhonio Stereo System. An unusual ap- proach to stereo speaker design, the Weathers stereo speaker system consists of the non - directional Hideaway Bass and a pair of Har- mony stereo speakers. No bigger than an un- abridged dictionary (11 x 9% x 3% inches) the Harmony stereo speakers have a stated frequency range from 70 to 15,000 cps and have a power -handling capacity of 3 watts. The speaker is a full -range moving coil type

bearings in both axes insures freedom of lateral and vertical motion. Finger -tip stylus - force adjustment is mounted directly oit the tone arm assembly. Patented roller -feeler guide in the tone-arm head permits the 100G to op- erate automatically and intermix, regardless of record size. Fast change -cycle time is con- stant irrespective-of operating speed. A stereo - mono switch introduces a phase- cancelling feedback circuit to remove vertical signal when stereo cartridge is used to play monophonic the Model CX2 twin tweeter, and the records. Notwithstanding its many features, Fspeaker.W2 3000 -cps crossover network. Each item the DUAL 1008 is simple to operate, only may be purchased separately. The ERD -12 is three push buttons being used to govern start, highly efficient and has a 40 -cps cone reso- stop, reject, and repeat functions. A muting nance. Response range is 30 to 15,000 cps. A switch assures silence during changing cycle. sturdy cast-aluminum United Audio Products, 202 E. 19th St., YGew with an impedance of 4 ohms. The Hideaway frame supports the 8 -1b. York N. Bass may be hidden out -of-sight under a table, 13 -oz. magnet assembly. Power rating is 30 3, Y. User net price, $69.95. chair, sofa, or behind drapes because of its watts. The CX2 twin -tweeter array extends small size (163.x16%x53( inches) and its frequency response to beyond audibility, at the non -directional characteristic. Frequency range same time enhancing high- frequency disper- EICO of the speaker is 30 to 80 cps and power han- sion. United Audio Products, 202 E. 19th St.. dling capacity is 10 watts. Impedance New York 3. N. Y. User net price, Model Stereo Changer /Player. The Eico -Dual 1007 is 8 is a luxury stereo changer /player at a popular ohms. Harmony speakers available in ebony CX212, $79.50; ERD -12, $59.50 ; CX2, $20.00 ; or cordova, Hideaway Bass available in ebony. FW2, $5.00. Weathers Industries, 66 E. Gloucester Pike. Barrington, N. J. User net price (complete system), $119.50. Separately Hideaway Bass, $69.50 ; Harmony speakers, $29.75 each. RECORD WHARFEDALE Compact 2 -way Speaker System. Designed CHANGERS by G. A. Briggs, the Wharfedale '60 achieves a truly unique music quality, its small size COLLARD notwithstanding. Employing the exclusive, non-resonant, sand -filled panel construction Stereo Transcription Changer. Deluxe 4- this system achieves an exceptionally clean speed automatic -manual intermix changer bass down to 20 cps. This panel consists of with heavy -duty, precision balanced, shielded two layers of wood with a completely inert and triple- interleaved 4 -pole motor is equipped filler of dry sand between them. Thus the with 8 -lb. non -magnetic turntable, 12" in enclosure, compact as it is, offers the smooth diameter. Flutter is guaranteed below .04%, performance generally ascribed to an infinite wow guaranteed below 0.15 %, rumble guar- batfie. The speakers are designed specifically anteed down 50 db. Each unit Is packed with for this system and are matched to each other individual laboratory specification sheet. Per- as well as tuned for the enclosure. The 12" mits manual operation when desired, and is

50 AUDIO AUGUST, 1960 PRESENTS A NEW HIGH FIDELITY COMPONENT TV RECEIVER

to increase the ways you can enjoy your precision audio equipment Now you can experience the great momcnts of television with heightened realism through a combination of high fidelity video and high fidelity audio. The dew Fleetwood Component TV Receiver makes use of broader bandwidths to bring you a picture of unsurpassed definition, sharpness, and detail. A ratio detector comparable in quality to your FM tuner delivers the audio signai to the pre-amplifier of your component system. There is also a built -in audio amplifier so that a loudspeaker may be directly driven from the receiver when you choose. The new Fleetwood component is built to professional monitor specifications and abounds with extraordinary new features. Model 1000 is equipped with a sonic, wireless remote control. Model 1010 is non -remote. You pre -set the fine tuning for each channel and rarely need touch this control thereafter. Fleetwood definition control permits adjusting the picture tó the degree of sharpness most pleasiñe to your eyes.

The 23 ", 110° deflection picture tube provides 282 square inches of viewing, and yet the depth of the set behind the frame is only I314i ". Custom installation has been made as simple as possi 31e. Tube, mask. and frame are factory installed. Never before has a television receiver so superior in all respects, so complete in all details been made available to the non -professional. Write for a complete description.

FLEETWOOD COMPONENT TELEVISION IS MANUFACTURED EY

GLENDORA. CALIFORNIA

FLEETWOOD COMPONENT TELEVISION IS MARKETED BY JBL INTERNATIONAL, LOS ANGELES 39, CALIFORNIA

AUDIO AUGUST, 1960 51 price. Featuring unusually simple operation and extreme flexibility, the 1007 is ideal for HEATHKIT the listener who enjoys convenience coupled with good performance. Utilizing a powerful Automatic Four -Speed Changer Kit. In real- two -pole induction motor with rotor individ- ity a semi -kit because most of the unit is ually balanced, rumble is reduced to a mini- pre- assembled, the Heath RP -3 series is avail- mum. The 0.7 -mil and 3 -mil turnover styli able in several versions, the differences pri- (the 0.7 -mil stylus is diamond in model 10070 marily consisting of the type of cartridge sup- and sapphire in model 10075) achieve close plied. The RP -3 features a turntable pause to 4 grams stylus force with no appreciable which stops rotation during the change cycle variation due to height of record stack. Com- thus eliminating the record wear associated pliance of the cartridge is 3.4 x 10-6 cm /dyne with the fall of a record on a moving turn- horizontal ; 2.0 x 10-6 cm /dyne vertical. Chan- nel separation is approximately 19 db at 1000 fs- Ecps. Frequency range is 20 to 16.000 cps. lectronic Instrument Co., Inc., 33 -00 North- ern Blvd., Long Island City 1, N.Y. User net price $59.75 (model 10070); $49.75 (model 100îa). removable plug-in head accommodates stereo or mono cartridges. Audiogersh Corporation. GARRARD 514 Broadway, New York 12, N. Y. User net price, $07.50. 4-speed Intermix Record Changer. The low- est priced Garrard changer, the Model 210 offers features and performance found in THORENS changers costing much more. Features include Four -Speed Semi- Automatic Plajter. The Thorens TD -184 is a four -speed turntable with integral arm, wired for stereo, and features the same basic adjustable-speed drive as the TD-124 transcription turntable. Semi -auto- matic operation-a simple dialing motion se- lects record size, starts table motion, and positions arm on first groove of record. Ad-

table. Flutter and wow are only 0.18 %. Other features include automatic intermix, a filter across the power switch to prevent switch pop," a muting swtich, and a metal tone arm. Tracking force Is 2 grants. Supplied with a changer base kit. a stylus pressure gauge, and a removable 45 -rpm spindle. Heath Com- lmny. Benton, Harbor, Mich. User net price. $59.65 (less cartridge). AD -I0, manual ster player kit $33.95 a die cast tone arm with plug-in shell, 4 -pole Induction -Surge" Garrard motor, easy a, cessibility and operation of the side -slide con- LESA trols, complete wiring for stereo, and a full manual operating position. Four -Speed Record Changer, Fully auto. Sporting an at- matic, the new Lesa Model CD2 /21 record tractive fawn and white color scheme, set off has by satin black turntable the 210 looks as well changer only two controls for all operat- justable piston controls lowering speed of arm. ing cycles, speed selection, start, stop, reject. Position trip shuts as it performs. Garrard Division of British In- Up to off player at end of record. dustries Corp., Port Washington, N.Y. User eight records of any size may be played idler is disengaged and lifts arm. Turntable net price, with plug -in head less cartridge, with automatic intermix. For manual opera- rides on nylon- seated ball bearing. Ann $44.50. tion, the record balance is simply moved to its tracking force is 2 side position. When operated manually, grants. Plug-in adapter the accommodates all standard stereo or mono - 4HF, transcription turntable and arm $59.50 tone arm is returned to rest automatically. phonic cartridges. Thorens. New Hyde Park. Till, manual player 3230 N. Y. User net price, $75.00. TD -134, manual 4 -speed player $59.95 GLASER- STEERS CBA -83NS, auto 3 -speed player 59.95 CD -43NS, auto stereo changer 79.95 Stereo Record Changer. The GS Seventy - Seven is precision- engineered, completely au- tomatic In operation. and offers new features and refinements which enhance the enjoyment of stereo records, at the same time allowing enjoyment of monophonic records to the ut- most. Stylus force is variable over a wide range with easily accessible vernier adjust- ment. Variation of stylus force between first TURNTABLES AUDIO EMPIRE Stereo /Balance Turntable. Deriving its name from the dynamically-balanced hysteresis syn- chronous drive motor, the Audio Empire Model 208 Turntable is a three -speed (33t4, 45, 78 rpm) belt- driven turntable. The precision- m achined. heavy aluminum base plate and turntable are virtually vibration free because after each record. A built -in click suppressor eliminates switching noises by means of an R-C network. A 4 -pole, carefully balanced. heavy-duty motor drives the CD2 /21's turn- table which has an exceptionally high moment of inertia. The tone -arm mechanism Is jam - the arm capable of being moved or hproof,andled at any time without damage to the mechanism. The record changing cycle time of 6 seconds is the same for all record sizes and and last record on a stack Is less than 0.9 speeds. Pre -wired for both monophonic and gram. The damped. acoustically isolated tone stereo operation, the Lesa changer is equipped arm is not resonant within the audio range, with a universal plug -in shell which accom- and moves both laterally and vertically on pin- modates all standard cartridges. Electrophono point bearings. Rumble, wow, and flutter have & Parts Corporation, 530 Canal St.. New York been reduced to insignificance by improved 13. N. Y. User net price. $39.95. motor design. As in earlier Seventy Seven mod- els, the turntable pauses during a change SM5 /DU2 4 -sp man rec player $29.95 cycle, and resumes motion only after the stylus has been lowered to the next record. to reduce stylus and record -surface wear. The MIRACORD idler disengages automatically in "off" posi- Push- Button Operated Changer. Recognized tion to prevent wow caused by flat spots. A by now as an old stand -by, the Miracord has dual -channel muting switch and R-C network kept step with stereo requirements without maintain silence for both stereo channels dur- major model changes. The XS-200 still em- of the belt drive and the "acoustic isolation" ing record change and at shut -off. Glaser - ploys a heavy-duty 4 -pole motor, push- button type of suspension for both motor and base Steers Corporation. 155 Oraton St., Newark, operation, and the Magic Wand" center plate. Incorporates pop -up 45 -rpm adapter N.J. User net price, less cartridge, with two spindle drop mechanism. but over -all per- spindle. Available in satin chrome or satin cartridge shells, $59.50. formance for stereo applications has been im- gold finish. Dyna- Empire, Inc., 1075 Stewart proved by the use of a heavy Y. GSC cast turntable Ave., Garden City, L. I., N. User net price, cover for GS -77 9.75 and additional motor shielding. Unit is fur- $80 0.$ B2ase0 in walnut, mahogany, or fruit. GS400 4 -speed stereo changer $47.50 nished with two output cables for stereo, and

52 AUDIO AUGUST, 1960 stereo nutshellìn a The compact component has come of age. And in the vanguard of this trend is Crosby's new Madison Fielding 650 Receiver - AM and FM tuners, stereo preampand powerful dual

14 -watt amps (48 watts peak) -truly stereo in a nutshell. This exciting compact (a Lilli-

putian 141/2" x 53/i6" x 113/4 ") features exclusive pushbutton source selection, center

channel stereo output, individual channel controls, mono -stereo blend and microbeam

AM /FM tuning. Just add the changer and a couple of speakers. Then enjoy music to stir

the soul. And the price barely stirs the purse ... a compact $219.95. r1'70d@1 650

l sJ 1E IQ IL 11 i >E lä = A! 9

.. ,vN,NO C:;111 AO.-..... CHANNEL O N E C H A N N E L T W O 0 °

madlson fielding : t/..sA n.. . i'...«.,

madison fielding by crosby

Crosby Electronics, Inc., Syosset. L. l.. N. V. Export Microwave International Corp. 36 West 44th Street. New York 36. N. Y. Manufacturers and designers of stereophonic components, speakers and the Crosby Compatible Stereo FM Multiplex System.

AUDIO AUGUST, 1960 53 BOGEN -PRESTO Series "T" Turntables. One of the oldest manufacturers of professional recording equip- ment, Bogen -Presto has built their many years of experience into the four turntables bearing the ' T" Series designation. Consisting of the 33% rpm Model TT3 and the three -speed Models TT4, TT5. and T68AH all have 12- Inch turntables except the T68AI which has n 10 -Inch turntable. R ow and flutter of all mod- the built -In stroboscope permit correcting turn- table speed as necessary. The speed regulator has an adjustment range of 15% in pitch. The stroboscope marks on back of the turn- table are illuminated by a neon lamp and re- flected by a mirror to provide a speed indicat- ing signal during operation. Neat Onkyo Denki Co., Ltd., No. 4 1 -chome Kends Hatngocho, Chiyoda -ku, Tokyo, Japan. PICKERING available in a stereo version. Electronic Ap- plications. lac.. 194 Richmond 14111 Ave.. Stam- " Gyropoise" Turntable. Engineered specifi- ford, Conn. User net price. $1150.00. cally for microgroove records-both mono- phonic and stereophonic -the Gyropoise 800 Stereotable is a single -speed machine operat- FAIRCHILD ing at 33% rpm. It embodies a unique method of magnetic suspension. on which patents are Belt- Driven, Two -Speed Turntable. The new pending. which eliminates vertical rumble to Fairchild Model 440 features 2 -speed operation the point that it becomes inconsequential in els is less than 0.15% at the 33% rpm speed. (33% and 45 rpm) from a single belt drive the playing of stereo records. Vertical period Rumble for the TT3 and TT4 Is 53db below plus a "Speed Sentinel" control that varies of spring suspension is below 5 cps ; compound average recording level ; for the TT5 and turntable speed by + 1%%. Speed change is vertical rumble attenuation is 12 db /octave T68AH rumble is 58db below average record- effected by a "finger' system which controls ing level. All Series T turntable platters are made of homogeneous aluminum alloy castings precisely machined. Hysteresis synchronous motors are used on all models, the TT5 and TOSAH using heavy -duty profesisonal models. The single -speed Tp1'3 is driven by a seamless belt, the other models employ idler wheel couplings, a separate idler being used for each speed. Bogen- Presto, a Division of the Siegler Corp., Paramus. N. J. User net price: TT3. $59.95; TT4 (shown), $99.50; TT5, $129.50: TO8AH, $170.00. CONNOISSEUR

Two -Speed Stereo Turntable. The new Con - noiseur, two -speed turntable incorporates a hysteresis synchronous motor and features per- formance characteristics found in more ex- the placement of the belt. The "Speed Senti- below resonance; noise is 65 db below refer- pensive units. Operating speeds are 33% and nel" applies d.c. to the motor windings to ence level ; speed accuracy is + 0.2 per cent 45 rpm from a single. constant -speed motor control the rotational speed. The entire as- total variation. Pickering & Company, Inc., with speed change effected by a double -stepped sembly is mounted on a channel for easy in- Plainview, N. Y. User net price, chassis only, cone, ground integrally on time motor shaft. stallation. Each turntable is packed with its $59.95. Model 800CB, complete base. in ma- The motor shaft is suspended in graphite final inspection record in the form of a graph. hogany, walnut, or blond, $15.00. Fairchild Recording Equipment Corp., 10 -40 45th Ave., Long Island City 1, N. Y. User net price, less base and mounting board, $69.95. REK-O-KUT 412 -1, single -speed turntable $ 87.50 Hysteresis -Motor Turntable Kit. Meeting 412 -2, two -speed turntable 107.50 professional standards throughout, the Model K -33-H turntable kit can be assembled in 30 minutes or less. using only simple tools. A GARRARD single -speed unit (33% rpm), it features a high- efficiency hysteresis synchronous motor Three -Speed Transcription Turntable. Fea- built to Rek -O -gut's exacting specifications. turing a speed control and a built -in strobo- scope, the Garrard Model 301 is designed for the professional and the high quality enthusi- ast. In addition to speed accuracy. the 301

nylon hearings and all revolving shafts are precision ground and lapped to a mirror finish. Rumble is down 50 db referred to 7 cm /sec at 1000 cps. Wow is 0.15% and flutter is 0.1% - Itunm level is down 80 db. The turntable is 12 inches in diameter and lathe turned of a non- ferrous material. The motor mechanism is mounted outside the turntable rim to reduce hum induced in the pickup by about 12 db as has less than 0.2% wow and lese than 0.05% compared with under- the -turntable mounting. flutter. Quality workmanship, long associated - - Available with wood finish, formica- covered with the Garrard name, is reflected in the ac- base at slight additional cost. Distributed in curately machined rotating parts. Comes com- the United States by Ercona Corp 16 West plete with 45-rpm Noise level is 52 below average recording level. adapter and mounting The crown -spindle belt drive uses a custom - 46th St., N. Y. User net price, $59.50. hardware. Gnrrard, a Division of British In- with Washington, made endless -woven fabric belt thickness Type B, 3 -speed turntable $119.50 dustries Corp., ort N. Y. User held at ± 0.001 in. An adjustment is supplied net price, $89.00. for belt tension. A built -in strobe disc permits constant speed check. The solid cast-aluminum EMT turntable is lathe- turned, and tapered for easy NEAT disc handling. The entire assembly is finished Professional Integrated Playback Unit. De- in silver-tone aluminum. Where economy must signed for the broadcast studio, the EMT 930 Four -Speed Turntable. Featuring an illumi- the is be -observed.- K -33;H presents an ideal ST a complete playback unit including pre- nated stroboscope. the Neat Model P -68 is an means of possessing 'a high- quality turntable amplifier, arm, and moving coil cartridge. attractive turntable with high -priced perform- at modest cost. Rek -O -Kut Company, Inc., 3S- Professional features include cueing light. mince characteristics which belie its price tag. 19 108th St., Corona 68, N.Y. User net price, strobe disc and vernier speed control. instant Driven by a 4 -pole. induction motor which is $59.95. start-stop braking, and a remote control. The designed to reduce vibration and noise, the EMT930ST can be cued to a syllable and P -68 has wow and flutter of less than 0.25 %. N -33H 33 1/3 w /hys sync motor $ 69.95 offers a choice of three speeds. Output is plus The heavy, die -cast turntable is 12 inches in K -33 1/3 w/4 -pole motor (kit) 39.95 ß VU ; wow and flutter 0.15% peak-to -peak ; diameter and is composed of a special alumi- B -1214 3-sp w /hys sync motor 139.95 signal -to-noise ratio is 60 db or better. Also num alloy. The magnetic speed regulator and BI2GH 3 -sp w /hys motor 99.95

54 AUDIO AUGUST, 1960 A FOR EVERY MUSIC LOVER

Whether your requirements are modest or magnificent, there is a fine -music Bozak Speaker System to satisfy every individual need. For Limited Space: The new Bozak "Spinets," quality two- and three -way Systems in compact, functional en- closures measuring only 141/2" x 231/e" x 111/2 ", that outperform any speakers near their size and price.

For Built-ins: Panel -mounted and wired two- and three - way Systems for convenient installation where you want them - in wall, bookcase, or well -made furniture. For the Hobbyist: The easily assembled, acoustically superior infinite -baffle E -300 Kit enclosure, with Bozak's one line of one quality components: the popular B -207A coaxial, the outstanding B-199A woofer, the unique B -209 midrange, the sweet-natural B -200X tweeter, distortion -free crossover networks -and, soon to be announced, the multi -purpose 8" auxiliary speaker.

For Decor: The industry's widest selection of custom - crafted fine furniture enclosures in Provincial, Urban and Contemporary styling with matching equipment cabinets - choice of fine finishes - or unfinished for special individual requirements.

For Stereo: The original and incomparable single - cabinet dual- matched System -the Bozak B -304 Stereo Fantasy. Or any pair of Bozak Systems. For the Connoisseur: Supreme in realism of music and sound reproduction, the magnificent B -310A and B-400 Systems.

Reward your appreciation of fine music . . . see a Bozak Franchised Dealer for The Very Best in Sound. BOZAK DARIEN CONNECTICUT

'F1 bearings for the turntable itself, the aria SONOGRAF would play records upside down. Ball bearings Three -Speed Belt-Driven Turntable. A truly are used throughout for all vertical and hori- -quality turntable, the Sonograf zontal motions, assuring smoother operation, Mprofessionalodel 2500 features direct belt drive at all increased record life, and longer trouble -free three speeds (33'j, 45, 78 rpm) with a spe- performance. In operation, the spring force is cial, resilient T" belt that virtually elimi- reduced to zero by turning the two knurled nates the need for periodic adjustment. Ver- knobs backward the sliding weight at the tical and lateral rumble is db back is then adjusted for perfect balance of - 55 and flutter the arm and cartridge. The knobs are then turned forward to obtain the desired stylus force. The head is of molded plastic and is fitted with four terminals. A wire ground lead is carried through the assembly for connection to a terminal strip under the turntable base. Stylus force adjustable from zero up to 8 grams. Electro -Sonic Lahoratoriesc, Inc., 35 -54 36th St., Long Island City 6, N.Y. User net price, $34.95. eliminates transfer of duet from mat to rec- ord. Weathers Industries. 60 E. Gloucester FAIRCHILD Pike, Barrington, N. net J. User price $74.50. 12 -inch Stereo Tone Arm. Continuing the ML -1, one -speed turntable $ 59.95 tradition of excellence exemplified by the pre- KL -I, ML-1 in kit form 34.50 vious Fairchild arms. the SA -12 features low K601, 33 1/3 rpm rec player 111.75 arm friction and lateral and vertical cutoff below 15 cps. Precision ball- bearings are used for vertical and lateral arm motions. all bear- PHONO ARMS and wow are with 0.1%. Speed accuracy is +0.0 with the stroboscope or ± 0.1% not using AUDIO EMPIRE the stroboscope. The built -in stroboscope is visible in daylight and may be used to adjust "Stereo /Balance" Arma. Precise in appear- speed while the record is playing. Built -in pro- ance and excellent in performance the Audio visions for levelling the turntable, plus the Empire "Stereo /Balance" models 98 (12 ") and built -in bubble -type level. simplify installation 98P (16 ") are well suited for high quality and subsequent adjustment. The motor is a monophonic and stereophonic systems. Maxi- fogs being protected against dust accumulation. heavy -duty synchronous, capacitor -start type, mum tracking errors of + 0.75 deg. for the 98 Micrometer -style counterweight permits accu- which is doube sprung for acoustic Isolation. and ± 0.6 deg. for the 98P plus arm resonances rate stylus force adjustment. Plug-terminated The speed control is magnetic. Built -in 45-rpm cables are supplied with the arm to eliminate adapter spindle, on /off switch, and a.c. pop" the need for soldering delicate wires. The uni- suppressor. Sonograf Electronics Co., 37 East versal shell slide permits easy installation of 28th St., New York 16, N. Y. User net price, all cartridges and features self -cleaning con- $99.95. tacts. Rear overhang only 2% inches. Built -in spirit level. Fairchild Recording Equipment Corp., 10.40 45 Ave., Long Island City 1, N.Y. THORENS User net price, $39.95. Transcription Turntable. Engineered for the finest music systems. the Thorens Model of 12 and 8 cps respectively for the 98 and GARRARD TD -124 is a four -speed machine featuring a 98P indicate the level of performance. Cali- full 12 -inch, 11% -pound table for lowest wow brated stylus -force adjustment from zero to Precision Tone Arm. Despite its modest cost and flutter. The main table is made of cast eight grams and counterweighted zero balance the new Garrard Type TPA /12 will give com- iron to provide shielding against hum pickup. adjustment for any cartridge from 2 to 25 pletely satisfying performance with either A cover table. made of aluminum, plus an at- grants. Precision ball bearings used for verti- monophonic or stereo records up to 16 ins. in tractive rubber mat, mitigates the al traction cal and lateral motions. Available in satin diameter. Practically friction-free movement chrome or satin gold finishes. Dyna -Empire, is assured by use of precision spring- loaded Inc., 1075 Stewart Ave., Garden City. Long cone -type ball- bearing pivots. Suitable for use Island, N.Y. User net price. $34.50 for model 98 ; $44.50 for model 98P ; extra shells, $6.50. BOGEN- PRESTO

Professional Quality Tone Arm. The Bogen - Presto PA1 tone arm is a precision unit built to professional tolerances. Ball- bearing suspen- sion plus a combination of spring balancing and counterweighting enable the PA1 to track at extremely low stylus forces. Adjustment of

15 with any turntable, the TPA /12 is stereo -wired and the plug-in shell will accept any standard cartridge. A new simple weight adjustment is easily accessible, and permits precision control of tracking force. The features of static bal- of magnetic pickups. Precision- machined. the ance. spring loading, and viscous damping have Thorens Roto-Drive is adjustable + 3.0 per cent stylus force is accomplished by rotating for A -in the all been combined In the TPA /12 to give a exact musical pitch. built illuminated knurled knob at the rear of the arm until the remarkable measure of audio performance. strobe allows setting to exact speed while rec- calibrated arm marking is reached. Range of Garrard Sales Corporation, Port Washington. ord is playing. Easy levelling is accomplished adjustment is zero to 20 grams less the cart- N.Y. User net price, $19.95. by means of a built -in level -bubble and easily ridge. The PA1 uses plug-in heads. Maximum accessible levelling screws. The precision 4 -pole tracking error is 1.9 degrees. Bogen- Presto, n motor is equipped with a compliant belt -plus- Division of the Siegler Corp., Paramus, N.J. GENERAL ELECTRIC idler arrangement which provides excellent User net price, $24.95. motor vibration isolation. The TD -124 operates "Stereo Classic" Compatible Tone Arm. on 50- or 60- cycle a.c. at any voltage from Every design feature of this tone arm is di- 100 to 250 volts. Thorens, New Hyde Park, ESL rected toward optimum performance from N.Y. User net price, $99.75. stereophonic records. These design features Gyro /Balance Tone Arm. Designed on the also give the Model TM -2G outstanding mono- TDK -101 33 1/3 rpm kit $47.50 principle that an arm should be balanced in every plane and the stylus force provided by a spring, the ESL Gyro /Balance arm has many WEATHERS advantages. Because of this design, turntable Two -Speed Lightweight Turntable. Ap- leveling is unnecessary, and on demonstration proaching the two-speed problem with the the ESL arm is often shown playing records same ingenuity that resulted in the well- with the turntable in an absolutely vertical known `Veathers single -speed model. the plane -in fact. if it were possible to keep the Model ML -234 uses two separate synchronous record and platter in place and provide proper motors; -one for the 333§ rpm speed and one for 45 rpm. Each motor couples directly to phonic qualities. The arm was developed spe- the turntable by means of a small soft -rubber c,fically for use with G -E cartridges, as an wheel, and a simple speed -shift lever selecta integrated all G -E pickup system. The arm's one motor and disengages the other. The primary feature for excellent stereo reproduc- Weathers method of reducing rumble and other tion is its static balance. When adjusted, the rotational errors by reducing the mass of arm maintains its lateral equilibrium at all motors and turntable is utilized in the ML -234 times, even if the turntable is not rfectly and is reflected in a rumble of - 70 db. Wow level. An unusual two -step tracking -force ad- and flutter are, respectively, 0.15% and 0.1%. justment is used for (1) balancing the arm The turntable mat is of special design which to zero tracking force, and (2) for making a

56 AUDIO AUGUST, 1960 NEW "DECORATOR GROUP" LOUDSPEAKERS

!J

Jensenloues, Lyle for every wood ... a wood for every mood

=rom the "style woods" of the world, Jensen chooses only the finest for their exclusive Decorator Group speaker .cabinetry. The woods are mated with graceful furniture designs to fit the mood of your home -whatever it may be. You may choose from smart modern Danish n warm Walnut, subtle Contemporary in clean Limed Oak, elegant Traditional .n rich Mahogany, authentic Provincial in lustrous Cherry, or a special unfinished utility model. Use as a shelf -type or as a diminutive consolette with matching base. Jensen's world -wide acceptance as the finest name in high fidelity speakers assures you of superior- quality components brilliantly matched and balanced to provide the finest home speaker systems ever produced. Visit your high fidelity center and TR -30 Tri -ette 3 -WAY SPEAKER SYSTEM see the Jensen TR -30 TRi -ette system soon. Hear a Featuring a new advanced- design 12" demonstration of the rich full -range sound. You will find FLEXAIR woofer, precisely coordinated ^. it a rewarding experience. with the BASS- SUPERFLEX enclosure to . I carry bass down lower and better than e TR -30 TRI -ETTE furniture models $159.50 (without base) ever before. Midrange and supertweeter unfinished model $134.50 consolette base-- $9.95 components are smoothly bolaced with new compression unit designs. MANUFACTURING COMPANY ensen 6601 S. Laramie Ave.. Chicago 38. Illinois Write for illustrated brochure "KU ". la Canada: Ranlraw ElacVic Co.. Ltd.. Toronto free Onision of tea Mutar Co. to YaalCa: Univaraal Da Mexico. S.A.. Mauleo D.F.

AUDIO AUGUST, 1960 57 precise tracking -force adjustment between zero mounting utmost of the available cartridges and six grams. Among other features are a on the market. Removable head is designed to CBS ELECTRONICS built -In arm rest, an easily removable car- hold cartridge on its mounting plate by single tridge head, a terminal board with four stereo screw through a slot in top of head for over- Constant Dixptncement Stereo Cartridge. lead terminals and one ground terminal, and hang adjustment. Direct- reading stylus-force Four versions of this ceramic pickup have been trim, modern styling with brushed aluminum gauge has instant disconnect, and "microme- introduced -with either diamond or sapphire, and chrome finish. Accommodates records up ter" counterweight assembly permits visual and either in phase or out-of-phase-these to 12 ins. In diameter. Specialty Electron e stn'ic balance check. Shure Brothers, Inc., terms referring to the phasing of the two Components Dept. General Electrc Company. 222 Hartrey Ave., Evanston, Ill. User net channels of the ceramic element. In -phase West Genesee St., Auburn, N. Y. User net prices: 11232, .$_9.95: M216, $31.95. cartridge, SC -1. provide conventional phasing price, $29.95. of the output signals for each channel. which permits the use of the cartridge with either SME stereo or monophonic records in any dual - GRADO amplifier or conventional stereo amplifier sys- Precision Pickup Arm. Featuring an arm tem, or it can be used in monophonic systems Laboratory Series Tone Arms. Engineered by to accept all cartridges, but available with mount that permits overhang adjustment connecting the cartridge outputs In parallel. without the need for changing original mount - The out-of-phase condition, Model SC -2, is matched Grado cartridges, this arm is the used with certain types of first in a series designated ing holes, the British -made SME arm em- two -way stereo the "Laboratory amplifiers in which n single push -pull Series." Intended to retain all the advantages output of the integrated tone arm /cartridge combina- tion with none of the disadvantages. this nrm

ploys a mounting plate fitted with a long slot in which the base of the arm may be moved backward and forward ns required. The arm rests on knife edge hearings. and two counter- weights are used, one to adjust static balance can be adjusted for overhang and weight with the smaller one at the zero position, and within the shell. Because of this, the arm then the second weight is moved to the de- need not be rebalanced when changing car- sired Milne force Lever- operated arm lifter tridges. Constructed of fine gunstock walnut is provided, with hydraulic "dash -pot" ar- with precisely machined aluminum fittings rangement to allow gradual set -down of arm the arm looks and performs magnificently. even though level is moved rapidly. Accom- Electrical connections are by screw terminal modntes all standard mono and stereo car- so that a soldering iron is not required for tridges, anti head is interchangeable with stage handles both channels, with the matrix - installation. To simplify installation in small Ortofon type G. Lectronies of City Line Ing of outputs being done in the secondary Center, 7644 circuits of the necessary cabinets the arm has been designed with n Inc., City Line Ave., Philadelphia two output trans- very small 31. Penna. User net prices: Model 3009 (12 ") formers. In -phase models are maroon, out -of- rear overhang. Adjustments are phase provided for vertical and lateral balance as $87.00; Model 3012 (16 ") $99.00. models are gray. Frequency response, 30 well as linear tracking force. A vertical stop to 10,000 cps + 3 db : channel separations, 20 is provided to prevent stylus damage. Track- db ; stylus force, 5 -7 grams. Compliance, 2 x ing error Is ± 0.8 deg. Credo Laboratories, SONOCRAF 10 cm /dyne; capacitance of each side. 500 Inc., 4614 Seventh Ave., Brooklyn 20. N. Y. ppf. Output voltage, 400 my at stylus velocity User net price. $39.50; with matched custom Model E400 Playback Arm. The Sonograf of 5 cm /sec. Stylus radius. 0.7 mil. cartridge, $69.50; with matched master car- model 2400 "All Balance" tone arm is de- Professional 55 Model. Offered with a 0.5- tridge, $85.00. signed for quality performance nt a moderate nail diamond, and only in the in -phase condi- price. Ability to track without sideward load tion, this unit is housed in transparent plastic, "Micro -Balance" ster tone arm $29.50 into the record groove even with the turn- and is furnished with two plug -in equalizing table tilted nt angles up to 80 deg. reduces networks. Specifications are the same as for stylus wear caused by warped records or models SC-1 and SC -2 except for frequency REK-O-KUT non -level turntables. For the same reason it response, which is 20 to 15.000 cps ± 3 db. Stylt be Stereo can replaced by the user with only a New Toncarm. Available in Iwo small screwdriver needed. CBS Electronic models-S-220. 12 ", and S -260, 16" -the new Sales Corp.. Division of CBS. Inc., 100 Endi- Rek -O -Kut "Micropoise" arms incorporate an- cott chored St., Dnnvers. Mass. User net price: single -jacket cable which terminates Models SC -1D and SC -2D (diamond styli). in two color-coded plug-in lends, two shields. $24.25; SC -1S and SC -2S (sapphire and a ground wire. The nrm styli). is designed to $17.00 ; Professional 55, 528.95. be hnlanced statically with the cartridge in- CONNOISSEUR Stereo Pickup and Arm. Incorporating tra- ditional British simplicity of design. the new Connoisseur "cushioned- control" integrated pickup arm is equipped with a 0.6 -mil dia- mond stylus stereo ceramic pickup and a lift- ing device which permits raising or lowering the stylus with an extremely gentle action. reduces record wear. Calibrated adjustment for tracking force reads directly in grams and operated without disturbing the static balance of the arm. Static balance is such that the center of gravity for nil components is situated in the axis of rotation, both verti- cal and horizontal. Adjustable ball- bearings are used for vertical and lateral motions. Interchangeable shells. Sonograf Electronic Cmnpnnv, 37 East 28th Street, New York 1G. N. Y. User net price, $29.95. stalled and then the spring- tensioned balance control is set nt the desired stylus force, from 0 to 6 grams. The gimbal mounting as- sembly includes twin sets of five -bell. one - millimeter bearings to provide what the com- pany describes as "the freest vertical and lateral motion found in any tonearm today." PHONO PICKUPS The arm is mounted to the base through n single hole, with a single locknut being tightened to secure it. Rek -O -Kut Company. AUDIO EMPIRE Inc., 38 -19 108th St.. Corona 68, N. Y. User net prices: S- 220, $29.95 ; S-260, $34.95. Sfcreo /Salanec Cartridge. Featuring wide frequency response and low tracking force. Rotating the large knob above the pivot point the Audio Empire model 108 is a high - of the arm lifts the arm from its permanent SHURE quality stereo cartridge at moderate cost. magnet mooring ; rotating in the opposite di- Frequency response is 15 to 20.000 cps + 2 dh rection lowers it with no more than its nor- Stereo Tone Arm. Modern, high -compliance with usable output at 30,000 cps. Output mal 3 gram stylus force. Frequency response light -tracking cartridges require arm balance voltage is 8.0 millivolts per channel balanced is 20 to 20,000 cps ±2 db. Channel separation of a high order in all planes to deliver undis- within 1 db. Channel separation is more than front 20 to 25 db and the constant velocity torted sound. The new Shure nrm pivots on 25 db. Inductance Is 500 mH and d.c. re- output is 20 me feeding into a 50,000-ohm drag-free precision bearings and easily made sistance 1250 ohms; reconutended load im- load. Finished in ebony with satin -finish adjustments for balance, stylus force, arm pedance is 47,000 ohms. Vertical find lateral aluminum highlights. Distributed in the height, and -for the first time -overhang compliance is 6 x 10- cm /dyne and the recom- l'nited States by Ercona Corp.. 16 West 40th for any type of cartridge mounting are pro- mended tracking force is from 1.5 to 5 grams. Street, New York 36, N. Y. User net price, vided. Available as model M232 for 12" Supplied with a 0.7 mil diamond stylus. Dana $59.50. records or as Model M236 for 16" records. Empire, Inc., 1075 Stewart Ave., Garden City. the arm comes with detailed Instructions for N. Y. User net price, $34.50. (Continued on page 75)

58 AUDIO AUGUST, 1960 cones that the resultant "muddy" sound is the most pronounced. Conventional material, in the thickness required for absolute rigidity, would be beyond the weight limitation which is fixed by mag- net size and available amplifier power (without expensive redesign of both components.) Exhaustive research turned up "foam ". Its correct name is polystyrene (a very hard plastic) -and the word "foam" is related to the form of the material in its final state. Air is entrained in it by agita- tion while it is liquid. When it cools in the mold, it retains the "foam" structure (internally) -along with its exceptional hardness and stiffness. Thus a thickness -and a stiffness -many times that of "paper" is possible with no increase in weight. Furthermore, the ratio of stiffness to weight and thickness is completely pre- produce efficiently the lowest bags fre- dictable and calculable. The engineer can "Accidental" quencies without distortion -would offer specify the proper thickness for the re- the ultimate clarity desired by high - quired rigidity. Weight will stay well Tests Prove fidelity perfectionists. within limits -and the molding of the Electro- Voice, committed for many cones can be controlled to sub- Superiority of years to ultra- rigidity in speaker con- microscopic accuracy. struction, produces a complete line of The result is a true inflexible cone - speakers having rigid, one -piece, die-cast which operates as a piston. There is no E -V Microphones frames. There is no exception to this. distortion of shape and none in the re- sultant sound. It all came about because Electro-Voice conducts many microphone It was inconceivable that an exception Electro -Voice is dedicated to achieving tests to determine durability. Occasional- could be made with a giant woofer just perfection demanded by the Audiophile - ly, though, we hear of a field experience because of its size. Actually its great size and has the engineering talent in quality more effective than anything performed demands extra rigid construction to in- and quantity to solve the problem. in our laboratories. Take, for instance, sure smooth response. Regardless of the the time a local engineer, preparing for extensive and expensive tooling required a game at a high school stadium, ac- in shaping the die, core, and die frame, cidentally dropped a microphone down a the 30W is now here. It is the world's flight of concrete steps. The case was largest and finest woofer, complete with DID damaged, but lack of time forced him to an absolutely rigid die-cast frame and hook up the one he dropped. His worry super bass voice. The die press required YOU about failure proved unnecessary because to produce the frame is one of the largest the microphone performed without the in the industrial state of Michigan. slightest loss in quality. Equal care and design went into all KNOW? Such unusual and unexpected circum- phases of the 30W development. It in- stances come to our attention because cludes a super- heavyweight (9% lbs.) we are asked to ascertain the condition ceramic magnet to increase efficiency and minimize distortion. The new, super-stiff A phonograph needle (stylus) travels and of microphones after mishaps. We were tracks between 500 and 600 yards every not surprised at the durability exhibited cone of polystyrene foam was originally designed for the 30W. It has almost time one side of an LP record is played because of our own unique method of and heat at the tip approaches 1000° F. testing every E -V microphone model. We three times the cone area of an 18 -inch woofer and moves an amazing column of This high temperature is the basic cause drop it, we roast it, freeze it, drench it of needle wear. The diamond, with its with salt water, explode guns near it, air without extra demand on the amplifier. The true -piston performance made pos- resistance to heat and abrasive wear and test for pressure at high altitudes, and its unequaled hardness, is the ideal stylus subject it to abrasive wear and tear. sible by the die-cast frame and foam cone enables this speaker to perform to keep record wear at a minimum. It Now, we don't suggest you abuse your beyond the demands of the most con- lasts 20 times longer than a sapphire, E -V microphones as we do when testing. firmed audiophile -absolutely distortion - too. Ask for Electro -Voice Power Point But, should an accident occur, it's nice free to below 25 cps. Needles and prolong your record life. to know the chances of anything affect- ing performance are limited. FOAM CONE: The cited example is only one of the Want more information on any of many requests received to check over Engineering the items mentioned in the Sounding field equipment and provide consultation Board; Simply check the appropriate in the field when desired. Lou Burroughs, Breakthrough boxes below and mail the coupon one of the founders of E -V, and Vice - to Dept. 80A, Electro- Voice, Inc., President of Broadcast Engineering, has retained intensive contact with TV and for Buchanan, Michigan. Broadcast Engineers. His on- the -scene Better Bass Foam Cones consultation has enabled him to help in Microphones the solution of many ticklish problems and has kept him abreast of situations The "foam cone ", just recently introduced 30 W which require special microphones. in super-quality Electro -Voice low - Needles & Cartridges frequency woofers, represents a major breakthrough in loudspeaker design -and NAME The 30 W -A Woofer a marked improvement in the delivery of for the Wildest clear, transparent, undistorted bass. ADDRESS Rigidity of the cone is essential for Audiophile smooth response. Until the advent of foam, larger woofers were forced into The creation of a large, low-frequency some sort of compromise between ac- speaker is not unique to Electro- Voice, ceptable weight and high rigidity. Con- nor is the 30W the largest speaker ever ventional "paper" cones in smaller diam- built. E -V, however, did recognize the eters can be thickened to the point of gkcZorce weight in- inherent advantages a woofer of this size inflexibility without undue ELECTRO- VOICE, INC. could have over a smaller speaker. Such crease, but this is not true of cones with a woofer, because of its ability to re- larger diameters -and it is in these larger BUCHANAN, MICH.

AUDIO AUGUST, 1960 59 RECORD REVUE Edward Tatnall Canby *

1. FOUR STEREO CLASSICS Haydn, Frenchman or no. I suggest that Mon- Brahms. Somehow, these super -Germanic mu- teux is the brightest conductorial light in the sical leaders of the last century are now Festival Casals de Puerto Rico 1959: RCA roster, and perhaps the best of the old removed from politics and even from nation- men still alive. Haydn: Symphony No. 45 ( "Farewell "); ality in the French mind -they are true class- His Haydn is (with Viennese help) limpid ics of the Western musical Mozart: Symphony No. 36 ( art, from the "Linz ") Fes- and lyric, of the old school but not in any French viewpoint. tival Casals Given the right place, given Orch., Casals. mannered way, less old- fashioned sounding by the right performers, French playing of Ger- Columbia MS 6122 stereo far than Casals' (Casals Festival 1959, on man music can be superb.' This Is it, right Columbia). He is a master stylist, this man bere. Performance recording has always been a with the walrus handlebar mustaches risky affair, and nowhere more and the Entremont, in his mid -twenties, is already a so than in the jolly walrus face; he can make any orchestra wonderfully imaginative pianist, enthusiastic atmosphere of excitement generated at a mu- of any nationlity sound sical musical. in everything he plays, full of immense energy festival. When the leading figure is but every world -famous, as with Toscanini bit of it effortlessly controlled. in the long You'll be aware immediately of his exciting serles of broadcasts or Casals in the more re- Wagner: Das Rheingold (complete). Flog- cent festivals personality here -he's a sort of French Ru- under his direction. the atmos- skid, London, Svanholm, Kmentt, etc., dolph Serkin, electric, phere is so charged (Columbia's own word for dynamic, but gentle too, it) that a recording Vienna Philharmonic Solti. his entire output of musical voltage going of the proceedings Is apt straight into Beethoven's musical to sound merely hysterical to the listener who London OSA 1309 (3) stereo Q 90006 expression, without a trace of the show -off virtuoso any- merely listens at home. far from the excite- seems ment of the living occasion. It to me increasingly clear that opera where. Gendron is in comparison a somewhat Numerous earlier on records must be judged restrained player Casals festival recordings have shown this on its own impact. on the cello, even less the quite separately from stage performance -and showy virtuoso ; but his technique, as well. trait in unfortunate ways. It is a plain fact goes that no recording that this new form of opera listening brings efficiently into Beethoven's music and the can reproduce the actual im- tremendous new vitality teamwork between pact of such a performance on those present to the operatic me- the pair is breathtakingly at the time dium, in an oddly "private" home -style perfect, down to the smallest detail of phrasing -what comes through, instead, is fashion. The glitter and occasion of or dynamics. the petty weakness of playing, born of too the opera much house itself are absent entirely; but the music In Brahms, these two are excellent but not excitement, the minor slips that are and the quite much rightly lost in the general fervor opera's sense come through with aston- as at ease as in the brilliant mid- of the actual ishing force, given a well -done recording. dle-period Beethoven. Brahms, for occasion but which show up mercilessly in the our time, cold beam This job is surely well -done, to put it mildly. tends to be overpowerlingly heavy and, in- of the cardiod microphones. The technique is, deed, he requires With that prelude as explanation, paradoxically, that of a sim- a certain massiveness for I can say ulated stage production-allowing for record- good effect. The massiveness is at once that these two symphonies come here, out- through with ing needs-and much of it was got down with wardly, but I feel somehow that it is not en- remarkable success. Perhaps it unbroken continuity and tirely comfortable for is simply that Casals, having learned pain- all the original fire, these light -fingered and of the opera itself. For the singers' benefit, the ebullient technicians. Nevertheless, sheer mu- fully, via a heart attack, the lesson of too - great more of this sort of realism in recording ses- sicality, the deep understanding and expres- expenditure of physical energy, now is sion, the sion of musical conducting with n minimum better the results, with wise micro - the language itself, carries of outward drama phoning. this Brahms into the higher regions and maximum of musical economy. (The re- of fine hearsal recording Unlike many opera recordings, then, this playing. made lust before his heart one features the singers The stereo version attack of some years ago bears at "stage distance" - adds a nice sense of this out.) minus solo mikes. In stereo, it works wonder- space around the piano and places the cello There is little hysteria here, only a few of fully modestly the Inevitable clinkers well. In mono, the effect is less good, to one side for a very natural illusion that get through in a since close -up recording tends to make up for of living music in the making. "live" performance, generally a warm sense of the music the lack of spatial literalness inherent in the with all the proper intensity of the mono medium. The stage occasion channeled into the playing itself. motions are handled Netania Davrath sings Folk Songs of expertly here ; Even the microphone pickup not a trace of false or exag- Russia. Orch. cond. Robert DeCormier. is good -and it gerated movement, no singers seemingly sus- was miserable in some of the earlier Casals Vanguard VSD 2056 stereo recordings. pended in space (not even the swimming Rhine maidens !), none of the sea -sick stereo that Out of the Ghetto. Songs of the Jews in What is most interesting, I think, is the sometimes markedly "old fashioned" conies forth in our less inhibited America. Leon Lishner, bass. Lazar approach of this stereo operas. Indeed, I found the imaginative elder statesman of music. Slow movements are illusion actually Weiner, pf. really slow, the Romantic more effective than the dated implications in stage effects still promoted in most live per- Vanguard VRS 9068 mono Haydn's score are allowed full play, the min- formance. uets have a maximum of that white- wigged conies in sharply different cate- gentility that To follow the actual text here, in German gories these days -Isere is one recording in is now so seldom heard in such and English, is to understand Wagner music; for we younger musicians must make as no thoroughly classical style and another in a all musical expression opera -goer can ever do, unless he knows the local popular manner, both musically top rank- over into the hard, tense music and the words by heart. I found expressiveness of our own day. it a ing for my ears, in the material and the de- The famous gripping and cohesive performance with very livery. "farewell," in which the musi- few [weaknesses and an abundance cians one by one blow out their candles and of strength. Netania Davrath, from Russia and then leave the stage as the Haydn Symphony nears Israel, is said to be equally at home in Mozart. Verdi and Ituss:an folk song its end, was enacted in full for this perform- Beethoven: Cello Sonata Op. 69. Brahms: -she is very ance. You much so in this folk song, which she sings can hear it -a series of bumps and Cello Sonata, Op. 99. Jiggles as the Maurice Gendron, with n notably good Russian styling and to a departing players knock into cello, Philippe chairs and music stands on their way out. Entremont, piano. typically cordion -style orchestra. Her voice Columbia MS 6136 stereo has that peculiarly whispy, little -girl bright- ness that is so wonderful in popular Russian I'd vote this the finest chamber music re- choirs, and a number of the songs are ultra- Haydn: Symphony No. 94 ( "Surprise "); cording of the year -if I had heard all of familiar and very beautiful, too. I've heard No. ( 101 "Clock "). Vienna Philharmonic, them. It's the best I've heard myself, any- some, such as "Parting," sung in similar style Monteux. RCA Victor LSC 2394 stereo how. by the great Piatninsky chorus. Davrath is Papa Here is a young French team playing Ger- Just as good. Monteux, whether conducting in Bos- man music, to perfection. Generally speaking, ton or Vienna, is a superb interpreter Leon Listener sings his American Yiddish In of Papa the French don't dig German art nor Germans the noble style of Schubert and Brahms-a but, in spite of their generalized dislike, they 780 Greenwich St., New York 14, N.Y. big, art -song basso with piano accompaniment. manage a real passion for Beethoven and a No matter ; the singing is beautifully done and co United Stereo Tape, 74 ips, 4- track. considerable preoccupation with Schumann and the music is good too.

60 AUDIO AUGUST, 1960 AN UNPRECEDENTED RECORDING!! ON AUDIO FIDELITY RECORDS

LOUIE and the

DUKES OF DIXIELAND srÈrrFnnrw ,,,, AN UNPRECEDENTED RECORDING! Louis e AUDIO "Satchmo" Armstrong, the great jazz FI0 BOURBON -- µ,a trumpeter who wended his way from New RBON tiI y y SWEET PARADE Orleans to Chicago, and the Dukes of GEORGIA WASHINGTON LLI BROWNADE & E ' DIAIE LEE SWIN o Dixieland, who 30 years later followed THAT G SOUTH IG'JUST E A PLENTY A CLOSERS the same path as their idol, join IIMEHOUSE WA IX AVALON ORLEANS WITH SHEIK 1A E"E WOLVERINE together in this, an OF ARABY unparalleled recording BLUES by AUDIO FIDELITY RECORDS. Superior recording techniques have given an unequalled realism to perennial favorites which Louie sings accompanied by the Dukes of Dixieland, this is one of the most exciting moments of this recording. Listen to the inspired playing of Louie's trumpet with the most prominent and organized jazz group that is performing today!

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AUDIO AUGUST, 1960 61 Sing -Along in Yiddish with Mary Kurz. sounding almost British or Scotch -and its presented doesn't smell at all. It's interesting Golden Crest 3076 mono unassimilated near -Eastern aspects. and so are the sound effects. In this recording, you'll notice a peculiarly The disc is of course only a brief excerpt- Here's more Yiddish, but of an utterly dif- intense singing style, the voices childishly ing of the complete film, but the job is well ferent sort! The craze for the so- called sing - earnest (in the best sense) and without a trace enough done as such things go. A Western - along (a sort of audience -participation kick) of vibrato. Youth is clearly dominant ; com- slanted orchestra of native instruments play is spreading all over the place and here a mon purpose shines through the whole per- a "written- down" musical suite, here and genial New York popularizer named Mary formance, naivete of a sort both pleases and, there in the continuity, the movements of weeps and shouts and antics his way through a bit, leads to a sameness. And yet these which are interspersed with other recordings these very New -Yorkish old-country songs. Hebrew-singing voices are haunting, even in as a sort of binder -the crudely Western with a batch of his friends to help him out. their not -profound music: the relatively crude harmonies of this music are revealing, with It's raucous, loud, exaggerated, but heart- little canons and counterpoints, the girls a strong feel of Russian pops music in warming for plenty who know the old songs - against the boys, have a ring of newness and them the one clear outside influence of "our" the Sweet Adeline repertory of Yiddish -and truth. civilization in the record's music. Against it, amusing for many who don't. Musically not Especially, I like the vocal quality and the the purely native sounds of music and people exactly profound and not In the least bit amazingly expressive effect of the absence of give a frightening glimpse into the utter Schubertian. vibrato. What couldn't we do with voices like foreignness of this enormous and dynamic this for Bach, for madrigals, chansons of Ren- civilization, bursting its seams so ominously now, as well as in Songs of the Sabras. Karmon Israeli Folk aissance Europe! But these people wouldn't enchantingly the hearing. be interested. They have their own musical It doesn't take much on -the -spot recording Dancers and Singers. job to do. today to project Red China on the march in Vanguard VSD 2059 stereo vivid fashion. Non- musical sounds here include a chil- -And finally, the newest in Jewish musi- Behind the Great Wall. (Sounds and dren's chanted reading lesson in Peking, some cal expression, the budding Israeli folk -popu- music of China, from the film of Robert vigorous city street noises, (the new and No it, Israeli lar music. question about the Menegoz.) Monitor MP 525 the old dynamically jumbled together), an musicians are right when they say : our music ancient marriage procession, river traffic in is borrowed and not yet mature -but give us Here, if I'm right, is part of the sound a Chinese gorge, the sound of the first train time. There is, indeed, already a recognize- track of what turned out to be the first over a new railroad bridge and the people able Israeli style even to such distant ears as smellie-scents of old China and new, re- screaming for joy, railroad work chants, mine, in spite of the divergent origins of a leased straight into your nostrils as you adapted straight from the Folk by former lot of Israeli material, its relatively oversim- watched. The picture wasn't taken with that boatmen, and so on. The sounds are strung plified and unsubtle harmonies -sometimes in mind, though, and the music as Isere together a bit confusingly, with few breaks,

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62 AUDIO AUGUST, 1960 but the jacket nor es keep you on the t rock most of the time. Folk Songs of the Louisiana Arcadians. Recorded in Grand Mamou, Louisiana. Collected by Dr. Harry Oster. Louisiana Folklore Soc. LFS A -4 (Folk - Lyric Recording Co., Baton Rouge, La.)

This is quite a fascinating record of still - exlating French folk music Iii the depths of the U.S.. in spite of some rather crude editing of the tin -the -spot documentary tapes. like most such slseial recordings, an impressive roster of tin rt lei i la ut a, editors. couuncutators Is given but the sales source of the netutl LI' is uudtted -I give you the name of tile Celle inertial producer above, who should know where the darned thing is available. The :l radians (''CajuII" in modern slang! veer.' French settlers in Nova Scalia who were mercilessly driven out a century after their arrival when the British took the place over- that would be auuund 1î1h. They ended up In Louisiana. which passed from the French to the Americans direct, and there they still are. still-amazingly enough -- speaking some Fi each and singing it. ton. The Cajun folk songs are a hit like those uC French Canada. French with superimposed modern influence, We French aspect reflecting

the .nog and language of a forgot tea age, pre - served through the folic process ul tausuats- siun. The music here is divided (by the schol- ars- -tint the singers i into that dating from the Nineteenth renttry alai alter, versus the Eighteenth century and earlier, though all of it. of course. is performed in its present -dap living form. The mixture is a curious one the clearly French aspects of the songs blended into n good deal of equally plain American hill -billy style. :is perhaps of the Ozarks to the North. Harmonicas and guitars are heard In force; this is nut "reconstructed" nor "au- thentic" folk music in the scholarly sense but simply the music that still exists of Its utvu aeeurd ill the small and relatively isolated town where it was taken down. Editing problems Involved two typical folk phenomena. First, umniy songs tend to go on auul uu. tau long for the L1' requirements. Second, the singing Is dune at a sort of party atrai r, with much talking, laughter, applause. The editors have made uncomfortable fade- outs in it few songs and have chosen to give a tantalizingly small segment of the always interesting after-comment that follows each MULLARD tubes and circuits, already acclaimed perfurwaace. Mure would have been in order, sill ely. throughout the world for their advanced The only proper solution to this problem is engineering and reliability, are in great demand to manage the original recording so that there for today's stereo amplifiers. are clean breaks of silence after teach piece - but this is Inure titan most l'ulksuug collectors can pull o0' under the solneWhat harrowing Heading the preferred list for power output tubes circa Iii.ta fires : is -\ fine honk of background materi:il and com- the MULLARD EL-34/6CA7. This extremely plete next, in English and Frem -h aues with linear output pentode which is capable of 60 ihe. reuI. Mullard watts push -pull in Class ABl (60 watts per channel 3. BACH, HANDEL & CO. stereo -120 watts monophonic) gives a special superiority even to the finest components. This Handel: Acis and Galatea. Joan Suther- Trade Mark Mollard Ltd. linearity coupled with a uniformity that is already land, Peter Pears, Owen Brannigan, well known make the MULLARD EL- David Galliver, St. Anthony Singers, 34/6CA7 Philomusica of London, Boult. the first choice for superb sound reproduction. L'Oiseau -Lyre SOL 60011/12 stereo Design and build your stereo equipment This i- an early masque by Handel. charm- around lug and wonderful in its formalized mytho- MULLARD. Circuit and interchangeability data for all logical laaucy- shepherds and shepherdesses, MULLARD Electron Tubes are available at your the giant Polyphemus, the hero's touching death and his converslnn into a god. The distributor or write to Technical Services Division. whole thing is a series of fanciful tableaux, more or less in the Italian opera fashion- the action happens in fits and starts, fol- "Circuits for Audio Amplifiers" is a new MOLLARD publication in which the lowed by burg musical commentary. Since the wide range of MULLARD high quality audio circuits is presented iently music is what we're after, the convention in one book. Four introductory chapters art devoted to theoretical and Is most pleasant. Nobody could write music practical considerations of high quality sound reproduction with monophonic like 31. Mandel, and Is l'artieularly equipment or with st phonic systems. Th. rest of the book comprises it nice circuit to hear the fresh, ingenious early Mandel, descriptions, constructional details, and some performance figures of borrowing 12 MULLARD circuits. These circuits include well -known MULLARD designs, mightily from Henry Purcell of some modifications and improvements England and to these circuits, and a number of from his Italian (:cods on the completely new ones. Only S2.50 from your dealer or by mail from our continent too. skillfully pulling together the Technical Services Division. best of every style he had encountered In his traveling caleer. A charming and very British- sounding per - formance, wholesome as fresh milk and just INTERNATIONAL ELECTRONICS CORP. as good. You'll be amazed, and amused, at the preposterous text, Ilandel's first In Eng- 81 SPRING ST., NEW YORK 12, N. Y. lish; bat the music will carry you onwards,

AUDIO AUGUST, 1960 63 making sense of the story even when the words practically fall over themselves in confusion.

Handel: Israel in Egypt. Miriam Burton, Betty Allen, Leslie Chabay; Dessoff Choirs, Symphony of the Air, Boepple. Vox STPL 511.642 (2) stereo I have no hesitation in being partial to this recording of landel's most dramatic and perhaps greatest oratorio; this is without any question the best recorded performance of it so far, by a wide margin. It isn't the solos, whose role Is relatively small. It isn't the orchestra, which is large and was interestingly distributed to bring out the brass and woodwinds and the typant. It is part the chorus, which is a double one In most of the work, one bank of singers on each side of the orchestra. The impact, via Paul Boepple's conception, is mainly in the sheer cumulative drama of a work that ob- viously -once you hear it in this fashion - was meant to be done with exactly this In- tensity. Too many performances Just let it ride along, in the old fashioned oratorio manner out of the Nineteenth century, de- take graded to a stodgy musical lip service. The recording is one of those rare concert the controls tapes that come out sounding like recording - sessions, with the added aliveness of actual performance. There are almost no audible see why everything audience sounds, the balance and stereo ef- fects (Carnegie Hall) are remarkably good, a tape recorder should do... the musical boo -boos are few. (A few sec- tions were done over after the performance, to correct faults.) Only one major slip got into the record ; it is in a solo part and you'll the new need experienced ears to spot it. The astonishing impact of the Handel music in the performance was somehow captured in the recording as well. I had my fingers crossed; I was amazed to hear how success- fully it had been managed. UHER Note: The audience was asked to pause before clapping, so there are no sounds of Stereo Record III applause to mar the endings. Handel: Concerti Grossi Op. 6, Nos. 1, does best! 2, 3. Handel Festival Orch., Halle, Horst - Tanu Margraf. Epic BC 1074 stereo From the moment you hear its incomparable high fidelity performance -from the instant you realize the wide range Halle, in Saxony. was Handel's birthplace of capabilities the versatile controls put at your and thus has a good claim on the composer command -you know that the Uher Stereo Record III is an exciting new experience who is usually known as the greatest of in stereo tape recording. musical Englishmen. It is decidedly interest- ing to hear this remote German conception Here's what the Stereo Record III does ... and why it does it best! of these concerti, so very much a part of High Fidelity Performance, Unsurpassed -Broad 40 to 20,000 cps frequency re- London (yet so clearly out of continental sponse; music of Handel's time, too), and this set of negligible wow and flutter 0.1 % ; high -55 db signal -to -noise ratio and con- playings Is unusually rewarding in several stant speed hysteresis- synchronous motor assure the highest possible performance respects. standards. First, there has seldom been such a clear presentation on records of the sense of the Versatility, Unlimited- Sound -on- sound! Play back on one track, record on the other concerto grosso, with its larger body of -simultaneously. It plays either 2 or 4 -track pre- recorded tape, 4- tracks 1/2 mil "ripieno" or orchestral strings setting off of the tape, on a 7 -inch reel, played at 1% ips 17 solo trio, two violins and cello, plus provide more than hours of play. The harpsichord. In .older performances the optional AKUSTOMAT automatically very operates the tape transport only when voice or shape of this contrast was garbled ; the solos program material reaches the microphone. The Stereo Record III is adaptable for and harpsichord were often omitted. In synchronizing.automatic slide projectors. many recordings of technically proper per- formances, the solo group of players is mis- Flexibility, Unequalled - Fool -proof and jam -proof controls provide individual takenly so amplified and reverbrated that the adjustments of each channel: volume, tone, fade -in and fade -out, channel and relationship is utterly falsified. Here the bal- speaker selection. Fingertip control ance between the solos and the "tutti" is of pause, stop, rewind, fast rewind, forward, fast exactly right. the dramatic interchange be- forward, speed selections of 7th, 33/4, or 1iá ips, and a recording safety lock. Has an tween the two groups is just about perfectly accurate digital cueing meter. achieved. Don't study music history -just listen to this! It tells its own story in Monitoring facilities, plus dual recording level indicators, simplify making stereo or seconds. mono recordings. High and low impedance inputs accommodate any type of program The solo fiddles (the cello and harpsichord source. Outputs for external speakers and for direct connection to external high provide the bass and harmony) sound thin, sharp and clear, not loud, as fiddles should fidelity amplifiers are provided. Truly portable weighs only 33 pounds. - Complete in the live performances : the main orchestra's with 2 Dynamic High Impedance Microphones, Amplifiers, Speakers and Carrying music is much louder and fuller, in contrast Case. $399:50 -which is obviously as it should be. (The power of the solo mike usually throws the FAMOUS UHER UNIVERSAL - High fidelity perform - balance the other way, with the solos louder ance-a most remarkable dictating /playback instru- than the orchestra.) Somebody in this re- speeds from 15/16 ips activated cording crew knew his Baroque music. ment-3 -voice - Next, the playing is notable for the pure, automatic continuous playback. With Remote Control blended string tone, light and almost Italian Microphone, Carrying Case, Reel, Dust Cover. in style, marvelously clear in the harmonies. It is a classic sound, decidedly, almost de- $299.95 plus f.e.t. tached, but there's every indication in the Your dealer invites you to take the controls of the exciting Uher Stereo Record Ill. result that such a pure blend is what Handel could well have had in mind himself. The For further details write: Dept. A -8, WARREN .1. WEISS ASSOCIATES music fairly blossoms under such treatment. Sole U. S. Agents, 346 West 44th Street, New York 36, New York And yet, I must note a characteristic mod-

64 AUDIO AUGUST, 1960 entity of approach that is both good and not so good. These players take their Handel in the new young contemporary style that seems to rise up everywhere In the Western world-fast, rigid in tempo, march -like, with very little give, the phrasing, or shaping, of the musical patterns almost non- existent but the accuracy of the notes showing care and sincerity of purpose. This is not hard, in- different playing; it's just modern, as our young people understand their music. Ltritzt-1C 1-Ja< v /l `ZG`^N 06,1 ' ' v I do like this lean, economical quality, the lack of sentimentality, the business-like ex- position. I decidedly enjoy the sharp ac- curacy of the playing- But I miss the phras- ing. I dislike the mathematical, machine -like AbmaideaA .klye exposition of rows of notes all exactly equally emphasized. This all- too -typical mannerism of the modern young performer makes for a dry, anta noncommittal sort of expression that seems cia}/ frtsid to say -here are the notes, each perfectly shaped and exact; post infer the expressive- ness for yourself ; it's not our business. It is an attitude worlds removed from the still - 4Iaet familiar juicy unctuousness of many of our older conductors and their orchestras, but it is a rapidly spreading attitude, nevertheless, and we'll hear plenty more of it. Lack of phrasing. shaping, may be quite all right in music of today, where it is in- tended as part of the new designs. But I can't really believe that a Handelian theme should be Modki 3,50 any less shaped and shapely than, perhaps, Dye a spoken sentence in plain English. One does not pronounce "decoration" "dell - kor- ray -shun ", in so many equal and detached u)Cf-C-Y/z machine -syllables; no more should a tune of Hendel's day be played, as these players often do, as a string of perfectly equal notes, without accentuation. It's not good, even when the playing is as beautifully accurate as this. 5 Lovely, natural stereo with smooth, easy presence and. as above, the right balance between solos and orchestral stings. CIJ L1t GÌ_C.1'L

Bach: Cantatas No. 56, ( "I Will Carry the Cross with Gladness "), No. 82 ( "Oh Lord, 'Tis Enough "). Mack Harrell, bar.; RCA Victor Orch. and Chorus, Shaw. RCA Victor LSC 2312 stereo 50tale The fervent, reverent, intensely musical bari- tone singing of the late Mack Harrell carries this record of two cantatas for baritone solo to a height well above some of Mr. Shaw's other well -bred offerings. It isn't possible to 6z/fed veA,&C% put a commentator's finger upon the subtle sincerity that makes Harrell's singing greater than the excellent music- making of the Shaw - conducted orchestra -just a quality that I can only call "noble," and if you don't know what I mean, I can say no more. These Easter cantatas are in themselves wonderfully noble, resigned, dignified, the finest of Bach in the peculiarly expressive cantata 04. C9r.., medium. The nobility is implied in the orches- tra, via expertly polished, smooth and perfect playing, but without Mr. Harrell I think I would find it too velvety- pious, i.e., a bit dull. % A (;frv io--c& On the other hand, the singing voice is here the leader among equals and it is entirely right that the soloist should excel in sheer musicianship and expressivity, above his as- sociates. A lovely record. (For those who like their titles in the origi- ¡orn ! nal, even if in parentheses, these cantatas are "Leh will den Kreuzstob gerne tragen" and "Ich habe genug.") 3 s&itol 1,A a4cd Ka-rra de.ex-gekr, A Program , of Bach Arias, Bach Aria Group, Wm. Scheide. (Julius Baker, R. Bloom, Eileen Farrell, N. Farrow, B. , Greenhouse, Jan Peerce, Carol Smith, sound *.° Paul Ulanowsky, M. Wilk). Decca DL 79408 stereo without GeiZtù . ..%a,za.e.,2.. Year after year, and now in stereo, the Bach Asia Group goes along on the same track, ., // put- t sG+-Q- ting its distinguished roster of important solo- fury ists to work on isolated Bach arias, detached from their context in Cantatas, Masses and other larger works; the group's success in New York concerts has always been great; and per- haps it's no wonder, since people tend to NESNA Ml N Y EL EC TRONI C CORR, (Continued on page 81) Ne4k.a-ty, Pe.YVnísva.

AUDIO AUGUST, 1960 65 are set down here with due regard for tradi- tional verities. Eddie Condon directs a sep- tet, composed of both former and present em- ployees at his emporium, on Original Dixie- land Band tunes. Rex Stewart, Cutty Cutshall, Bud Freeman and Herb Hall make up the front line, while George Wettling delivers a stable rhythmic propulsion on drums. Re- visited are Sensation, Ostrich lyaik, Lazy Daddy, and Rcisentoeber Rag. George Avakian, during his short stay with World Pacific, produced the (late with his usual respect for the niceties of balance and stereo placement. leads the band which he brought to The Roundtable, this time to a studio, and the audience response of his last release is replaced by a relaxed, moody at- mosphere. This is a great help as the trom- bonist sings A Hundred Years From Today, assisted only by Don Ewell on piano. Ewell contributes Roundtable Romp, and a freshly conceived solo on Tin Roof Blues. Besides writing Blue Dawn, Don Goldie displays in- creasing ability and n trumpet tone and style remarkably like King Oliver's. The leader also CHARLES A. ROBERTSON* vocalizes on Ever Lovin' Baby, Aunt Hagar, and Ain't 'Cha Glad. His trombone sounds es- suasive than when arbitrarily contrived in the pecially golden in stereo. STEREO studio or on the arranger's desk. to new jazz Bill Russo: School Of Rebellion Stan Kenton is always sensitive West Side Story trends, especially when they concern the area Andre Previn: Roulette SR52045 staked out for his band. Not that Bill Mathieu Contemporary S7572 Stan Kenton: Standards In Silhouette asks for anything in his arrangements that is Bill Evans: Portrait In Jazz Capitol ST1394 unfamiliar. But Kenton is often too preten- Riverside RLP1162 tious in concert. overly romantic on ballads, Since January of 1959, Bill Russo has sched- or too frantic when he turns to straight jazz. If the proof of jazz versions of show tunes uled weekly rehearsals of an orchestra which He also usually assigns a tune exclusively to is lyric inventiveness, the trios concerned he calls a school for composers, musicians and one of these categories. Mathieu's treatments here have it-and to spare. Leonard Bern - listeners. Of the twenty -two members in at- bear the concert tag, but the point is never stein's score seems rather challenging for three tendance on its LP unveiling, about half belabored. Instead, lie strips away orchestral men, but Andre Previn and His Pals are ex- stayed the full course and numbered among devices that once were considered modern and perienced at hanging from musical cliffs. The them are some of the top studio names in New places emphasis on a series of soloists, gen- pianist started the jazz -show album trend York. Meanwhile, Stan Kenton plays a set ar- erally starting them off with melodic state- with Shelly Manne back in 1956, and the pair ranged by Bill Mathieu, one of Russo's stu- ments before building and resolving tensions. have alternated as leaders in accounting for dents and a fellow Chicagoan who helped in Proper tempering and superb stereo makes a long series of best -sellers. With an assist the planning of the orchestra. As Russo got this one of Kenton's best . from bassist Red Mitchell, they surmount his start as an arranger for Kenton in 1950, Rolf Ericson's trumpet expresses the melan- their biggest obstacle to date. In the best of the interlocking influences of a decade are choly of Meaning Of The Blues, and trom- stereo, it makes pleasureable listening. Ben now brought full- circle. bonist Don Sebesky is featured on the seldom - Shahn's painting "Handball" is reproduced Although attacking the established order, heard When Sunny Gets Blue. Charlie on the liner cover. Russo's rebellion is affirmative rather than Mariano's alto sax ascends to a climax on Bill Evans engages in an attempt to gain destructive and will require considerable time Django, while trombonist Archie LeCoque and wider public acceptance on his current LP. to accomplish. Its immediate effects are a gen- Bill Trujillo on tenor sax, tell the story of The fact that it comes a little late should not eral lightening of orchestral textures, the ab- Lonely Woman. This last title is a lovely deter any of his admirers. Due to the success sence of screaming brass, and a subtle control Benny Carter tune, not the Ornette Coleman of previous efforts, the pianist recently com- of dynamics. Four cellos add a colorful touch, original of the same name. When Kenton or pleted a cross- country tour and his reputation and the percussive drive of Ed Shaughnessy Russo creates an orchestral background for is steadily growing. Accompanied by bassist keeps the ensembles from sagging. Whether the new alto -sax discovery, the millennium Scott LaFaro and drummer Paul Motian, he Russo finally achieves rill his goals or not, he will be here. offers melodic improvisations on When I Fall now commands a remarkable orchestra and In Love, Spring Is Here, and What Is This articulate. soloists. : Earl's Pearls Thing Called Lover Neither of two originals On display are seven Russo compositions MGM 5E3832 quite equals Peace Piece, from his previous and a statement of musical intent : "Our album. But perhaps that inspired performance music is American, but in a different way than Pleasant as it would be to have a new solo is one to regret, as the pianist has difficulty most jazz today. The America of Melville, album from Earl Hines, the opportunity to in recapturing it in answer to casual requests. Emerson, and Thoreau is better and stronger hear the patriarch of jazz pianists sounding Credit the tape editor for creating the same than the America of Norman Mailer and his tribal call again is welcome in any con- reflective atmosphere by placing in sequence Tennessee Williams. This is the mainstream text. A new recording contract, with the prom- Some Day Ify Prince Will Come, and Blue In which attracts me-an America which is ise of additional LP's in the offing, resulted Green. Fine stereo from Jack Higgins of fresh and new and vital and curious. There is from his leaving San Francisco last winter on Reeves Sound Studios. more to this country than the city dweller, a cross -country tour of nightclubs. As the the Negro slave, the machine. There are the leader gives fresh proof of his pre -eminence farms of Illinois, the precise churches of New as an accompanist, it seems incorrect to call Ray Bryant: Madison Time England, remembrances of Spain in Tampa his companions a supporting group. If more Columbia CS8267 use and Santa Fe, and beautiful horses. We pianists perfected the art to the same degree, Bill Davis: Dance The Madison! the traditions of Europe as we wish. Our cre- would regard the instru- Wild fewer modern groups SDBR1094 dentials are not from Europe's institutions ment as expendable. Listening to the inter- Everest to use anything the but we are not afraid action between piano and Calvin Newborn's is turning us." While depending While part of the world offers guitar is a constant joy. -and stars into ballad singers like a tall order, and Russo former rock -roll That seems upon Carl Pruitt, bass, and Bill English, to keep teenage audiences, an- hardly claim to have filled it in the Hines ex- in an attempt would drums, for rhythmic excitements, is capturing a large share of the of one LP. But he shows great progress along side. other faction space plodes his own fireworks right by gradually converting it to jazz. Kenton days, retaining the best elements Hines never needed a crutch market since Of course, Credit for the deepest inroads goes to The of the style while leaving brittle concertizing during solos and at times the help seems super- behind. To- Madison, a new dance step made popular by and Hollywood -Freeway jazz far fluous. There are new editions of Rosetta, who accounted closer to the sylvan reaches of Boogie Ray Bryant, the same pianist day he stands Stcalin' Apples, and St. Louis Blues fine solo LP's when with Prestige. or the searching insight of An are a supremely for such Tanplcwood, Woogie. Among the surprises Now listed among the top sellers and on an- On Clark Street. Included is a brilliant and a swing version of The Esthete lyric Manhattan, label, he accomplished the switch with- of Manteca, and cellist Seymour also vocalizes, sounding like a other arrangement Saints. Hines out compromising his high standards in the Barab solos on Fred Carlin's jaunty What Is subdued Fats Waller, an I Can't Believe, and is kept promi- soloists are Frank the slightest. Of course, the beat The Difference. Other You Can Depend On Me. Fine stereo keeps but the band avoids the dis- Dick Meldonian, Bill Elton, Larry and the Hines plano nent for dancers, Sosolow, guitar under control turbing, unmusical traits which some others Wilcox. and Lou Mucci. tone is among the best ever. di- still use to attract the youngsters. Buddy Tate One of Russo's theories of composition Benny Morton, into halves, allowing for is on tenor sax, while Al Grey, vides the orchestra Eddie Condon: Tiger Rag And All That Green are the trombonists. Harry questions and answers between members of and Urbie Jazz World Pacific 1292 Edison plays trumpet, and among the added the same section and making the whole less along with The split, with the Teagarden: Jazz Maverick starters is his Centerpiece, unwieldly. This Jack The title tune. two new is ideal for stereo. Because Russo SR25119 Hucklebuck. Besides centered, Roulette Bryant compositions in the saute vein are In- planned It that way, the effect is more per- calling off the Two good reasons for the dominance of cluded, with Eddie Morrison directions for Split T, and Hit It! 732 The Parkway, Mamaroneck, N. Y. dixieland in New York's smart East Side clubs AUDIO AUGUST, 1960 66 what make the Warrens' record sound different

. -.than ours?

they know what to play... and what to play them with... They know how to draw from today's wealth of magnifi- They know that faithful sound re- creation begins with the cent recordings for the musical fare most appropriate to phono cartridge ... it is the most important single ele- the occasion . . . for serious listening, for background ment in any home music center ... for it is both the source music, for entertaining, for development of their own and of sound and the means of preserving the original perfec- their children's musical tastes. And they know that the tion of the recording. The balance of the system is the self -same selections can sound good when re- created in proper domain of your High Fidelity dealer, who works one way ... and superb when re- created in another. within your budget and your decorating requirements.

this booklet on the tasteful music art of selecting, begins with a SHORE playing and Stereo Drnetic preserving records phono cartridge is available for 25e. Send to: from $16.50 to $89.50 SHURE BROTHERS, INC., 222 HARTREY AVENUE, EVANSTON, ILLINOIS, DEPT. FF

AUDIO AUGUST, 1960 67 Just which Madison Street the step was Be Another Spring. Billy May's arrangements of a roomful of boating enthusiasts on forced nnmed after is uncertain. But whether it origi- permit a covey of woodwinds to nestle among leave ashore. A vocal trio formed by Nor- nated in Detroit, Baltimore or Cleveland, there rustling strings. Better keep the liner, the wegian youths, The Windjammers hope to can be no doubt about its antecedents going photo on the cover Is a collector's item. continue careers launched in the Louis de back to the Chicago of Pine Top Smith and Rochemont film of their nine -month voyage on beyond. Wild Bill Davis moves it along a bit Les Baxter: Teen Drums a three-masted square rigger. It must have Viking courage to invade a studio in further. on Its new career by transferring the Capitol ST1355 taken catchy rhythms to organ, aided by the essen- Nashville, the stronghold of , tial drummer and a complement of jazzmen. Buddy Morrow: Poe For Moderns but engineer Bill Porter repays the visit with Among other tunes given the same danceable RCA Victor LSP2208 good stereo treatment. Nor are they afraid to treatment are Soft Winds, Flying Hoene, and take friendly digs at Harry Belafonte and the Riff. Both liners provide dance Should some organizations stamp approval rival Kingston Trio. They are Harald Tus- Intermission help charts, and the stereo in each case is un- on good records for teenagers, it might berg, Kaare Terland and Sven Erik Libaek, cluttered by the obnoxious sounds which once parents make a suitable selection, yet drive who appeared on the screen as pianist with soothed adolescent ears. young customers away in droves. While un- the Boston Pops, and a broad Scandinavian burdened with awards, neither release is accent salts each song. Beatnik Bill, in fact, likely to be too irksome for payola -wise elders was anticipated with an extra syllable to flt Les Baxter Gordon Jenkins: Presents Marshall Royal or too cultural for the junior set. Barnacle Bill, but it turns out to be set to the surrounds jazz -drummer Milt Holland with SDBR1087 tune of Buffalo Gals. Among sea faring songs Everest a battery of Afro -Cuban, Brazilian, and Puerto included are Sailor Man, Eddystone Light, George Shearing: White Satin Rican percussionists, timen lets the whole and the theme of the film. Capitol 5T1334 rhythmic gang loose in stereo. Only once does Oscar Brand commissions a spanking new an electric guitar get out of hand, but Pias set of original tunes dedicated to the sail and Listeners who like a modicum of jazz and Johnson's tenor sax keeps temperatures on the power boat fraternity afloat on coastal and a plethora of strings will find the experts on rise. Plenty of side effects from hand cymbals, inland waterways. The log is complete with these albums creating a restful mood. Besides tambourines, and timbales, in addition to entries on boat shows, power squadrons, skin leading the Count Basle sax section, Marshall booming conga drum. divers, the small boat mob, and the yacht club Royal keeps a watchful eye on other depart- Buddy Morrow translates the writings of boys. Some of the lyrics are too risque to pass ments in the band. When one of his rare alto - Edgar Allan Poe into stirring big -band per- customs, while others are nautical but nice. sax choruses gets on record, jazz critics formances- designed to shock, amuse and The only one not penned by Brand happens throw brickbats at the velvetry tone. Musi- educate. Bernie Green, Ray Martin. Charles to be one of the best, a fervent plea to Blow cians are more tolerant, especially since they Green, Norman Leyden, and Bob Davie are Me Home From Old Manhasset, credited to know that only Benny Carter and Johnny among the composers of the spine -shaking Gene Raskin. Masquerading as crew is a Hodges can reveal the melodic possibilities of interpretations. The Skip -Jacks, one of the seasoned group of accompanists called The the instrument so thoroughly. More adven- brightest new vocal groups around, sing The Sea Wolves. They stride manfully about the turous than when he provided Louis Arm- Bells, and The Raven. Keith McKenna, a deck, surrounding the singer in stereo engi- strong with a string background, Jenkins teacher of high -school English, recites Anna- neered by Hoyt Hughes of Gotham Recording. alternates on piano with Hank Jones. The bel Lee, and Uialame, just as he does for his twenty -two members of the ensemble are students in Bellport, Long Island. Chances spread across the stereo stage, while a four- are they will play his versions for their young- MONO teen -piece choral group and Basle's rhythm sters. Jim Chapin and Bob Wilber: Fun With about on occa- section splash colorful effects Drumsticks Music Minus One MM0125 sion. Jenkins revives Goodbye, and provides The Windjammers an old Oranim Zabar Troupe: Hora two fresh originals. Slip this one into LSP2196 Jackie McLean liner-and enjoy it. RCA Victor Elektra EKL186 George Shearing's profitable excursions into Oscar Brand: Boating Songs And All That Either of these aids to self instruction the mood world are looked upon with even Bilge Elektra EKS7183 But the pian- should also come in handy to get rid of sum- greater disfavor in jazz circles. from campaign ist always picks such gorgeous tunes as Either of these albums is awash with mer doldrums or as a refuge as guiding for novice There's A Small Hotel, Old Folks; and There'll enough hearty humor to buoy up the spirits speeches. Acting spirits

A mediocre tube is like a mediocre singer!

a

DON'T SETTLE FOR MEDIOCRITY... USE GENERAL ELECTRIC HI -FI TUBES! v GENERAL ELECTRIC - AUDIO AUGUST, 1960 68 drummers, Jim Chapin and Bob Wilber chart a course that ranges from big band riff choruses to more intricate solo Improv;sations. An enclosed sheet contains a few helpful hints from Sam Ulano, whose own drum albums are used as lesson material by many teachers. In his opinion, the layman can safely bypass most of the rudimental strokes and provide a smooth and steady beat for doming by con- centrating on one called the Rudiment of Rhythm. This is conveyed by use of the words "paint a brush," rather than notation. More complicated than the "mommy-daddy" stroke usually given beginners, it is still easier to ennunciate than "pork chops and lyonnaise potatoes," the phrase which causes Gene Krupa's facial contortions. Anyone who has been routed out of bed to prepare a bottle and a howling infant in the middle of the night New H. H. Scott should be able to master It without too much trouble. Advanced students will find plenty of space to demonstrate their wares during open spots 88 watt Stereo Amplifier drives in the ensembles on Ellington's Cottontail. and the ]taste- styled Like Help! Brisk ex- changes with solo horns will sharpen tech- niques on The Lady In .1 Traatlt and Wilber's 20 KLH Speaker- ,t, omet Pink Ice. Chapin remains at the drums throughout the session to 101111 a steadying hand, keeping time with barely audible brushes on sock cymbal and softly pedaled strokes on bass drum. Pianist Hank Jones and bassist R'ilbur Ware are allowed to operate with less restraint. I)ue to the huge variety of drum passages, Wilber nod his cohorts probably play a wider assortment of breaks than any group since 's plot Five. Jim Nottingham, l'rbie preen, Phil Woods, or George Dorsey take turns with Wilber, who confines himself to tenor sax, at stepping into the breach, be it a two - or sixteen -bar gap. As the kit includes a pair of drumsticks, aspiring drum tuera can begin practise on the nearest telephone book at once. For that mat- ter the box itself makes n nice bouncy pad. When wiser students start checking for warped sticks, record dealers may take some comfort in the knowledge that theirs are not the only gaols so afflicted. The company which prevails upon Saul Goudauun to do it parade - beat albuni and resume manufacturing sticks to go with it will 1w doing drummers a real service. Off the market for several years, this product of the New York Philharmonic per- cussionist now is especially valued and the drummer fortunate enough to own a pair scorns all offers. The Oranini %mbar Troupe Invites all those who are thrilled by Israeli folk dancers to emulate the performances by means of a rnnt- bind sing- along, dance- ttlong album. Fred Berk, who directs the dance division at the 92nd St. Y31-YWIIA in Manhattan. describes the four basic steps and gives detailed infor- mation on linking them together in dances which fit the dozen tunes. Some are rich in H. H. SCOTT. proudly intro- panel control; massive output tradition and others are creations of the new duces the most powerful, transformers using EL34 out- Israel. All are stimulating and the zestful most versatile complete stereo put tubes. Total weight 47 rhythms are a sure cure for that tired Peeling. made. A recent The booklet supplied also lists original lyrica amplifier ever pounds. Power Rating: 44 and translations. A stereo version is available demonstration at KLH Re- watts per channel (IHFM and Dov Seltzer's arrangements give it the search and Development rating); 0.8% Total Har- benefit of an extra accordion. plus other in- Corp., Cambridge, Mass., monic Distortion; Power struments added to those of the Israeli troupe. proved the 272's amazing ca- Band Width 20 -25000 cps. But niooaphonic grooves are more likely to pabilities. This powerful new $269.95. Slightly higher West survive a trip to summer camp or xchoul gym. unit simultaneously drove 20 of Rockies. Accessory Case Singin' The Blues KLH Model Six speakers to Extra. full room volume (with vir- tually unmeasurable distor- RCA Camden CAL588 tion). Pete Johnson: Pete's Blues UNLIMITED VERSATILITY H.H. SCOTT Savoy MG14018 H. H. Scott Inc., Dept. A -8 The versatility of the 272 is 111 Powdermill Road, Maynard, Mass. Because of the shorn I:fe of wtutiue shellac, unmatched. It has 25 separate many recordings on these L1's are harder to Its fea- o Rush me your new 1960 Hi Fi Guide locate in good condition than collector's items controls. advanced and Catalog. of thirty -five years ago. In fact, Leonard tures include such H. H. Scott Also include complete technical in- Feather goes one better, extracting from ltl'A exclusives as: electronic Dy- formation on your powerful new 272 Camden archives several sides not previously naural Rumble Suppressor* complete stereo amplifier. released. By not attempting to compress the which automatically removes NAMF whole subject into one album, 1w assembles a annoying turntable and rec- ADDRESS rare treat for blues enthusiasts and a few ord- changer rumble without surprises for jazz historians. his only require- audible loss of music; unique CITY STATE ments are a good blues and performers of such Export: Telesco International, 36 W 40th caliber as Fats Waller. Lizzie Miles. W'iugy Pick -Up Selector Switch; St., N.Y.C. Mannone, Jimmy Ituxhi ug. Jack Teegarden, separate Bass and Treble con - Covered by one or more of the fol- Earl Hines, Johnny Moore, and Ilot Lips trols on each channel; Center lowing patents: 2,606,971, 2,606,972, Page. The price is low and the quality high. with front 2.606,973. The Pete Johnson reissues first appeared on Channel Output

AUDIO AUGUST, 1960 the National label in 1946, and the Kansas Jimmy Mitchell suited his actions to the ceed the groove capacity. According to the City boogie -woogie stylist is abetted by such words, nearly taking flight in picturesque latest information, John Hammond combined stalwarts as J. C. Higginbotham, Ben Webster, swoops about the stage. Thermon Rith first the two, added voices to bring the total under Al Nicholas, Clyde Bernhardt, and Budd organized the group in 1930 at St. Mark Bradford's direction to one hundred. and will Johnson. Page reappears here and is featured Church in Brooklyn. Since then it has traveled release the result on Columbia shortly. It throughout in about the best example of his extensively. but the eminence it enjoys at pres- should be quite something. Better take this trumpet playing to reach LP. As the pianist ent is largely due to the addition of Mitchell opportunity to prepare for it. is now seriously ill at his home In Buffalo, about a year ago. A mighty-voiced youngster New York, any royalties will doubtless be ap- from Norfolk, Virginia, he shows great stay- preciated. The people who arrange benefit ing powers and should be around for quite Memphis Slim and the Real Honky Tonk concerts and memorials appear uninterested. a while. Adequate recording, and the program Folkways FG3535 includes Old Rugged Cross and Trouble In The Al Smith: Hear My Blues The Seloh Singers: His Eye Is The On Land. Prestige Bluesville 1001 Sparrow Gospel MG3002 Professor Alex Bradford boasts the singular Because of Prof. Alex Bradford: Walking With The distinction of having appeared at both the the revival of interest in authen Newport Jazz Festival and the Newport Folk tic forms of the blues, record companies have King Gospel MG3006 Festival. The present collection is made up of issued more good examples in recent months Alan Lomax picked The Selali Singers to recent outstanding single sides, all composed than in the entire first ten years of LP. In titis represent gospel groups at his Carnegie Hall and arranged by the leader. A female group instance, collectors have a choice between concert and the performance was one of the features Mottle Barber on Big Wind Blowing continuing their studies of a veteran of coun- highlights of the evening. One reason for its and a fantastic coloratura soprano, Carrie try blues or meeting a young urban singer who omission from the United Artists recording of Williams, on the title song. Its masculine creates his own material. Much of Memphis the event might be that the lead soloist eluded counterpart offers the tenor voice of Jonathan Slim's work seems sophisticated when com- the engineers. During the number which also Jackson on His Precious Love. Either group pared to older pianists, but the experts may serves as a title for the quartet's first LP, whips up enough intensity and volume to ex- want to decide whether San Juan Blues, a tune remembered front days in Memphis, sup- plies the missing link between Morton's Says Larry Zide in "Spanish tinge" and the boogie -woogie train blues. His second ad -lib concert at Folkways finds hint in a singin' mood and there are only two piano solos. His right hand rings out per- cussively on The Bella, and a figured bass charges through Boogie After Midnight. His ne( fd Guide versions of familiar blues are highly individ- ual. especially John Henry, How Long, and about the Sail On Little Girl. And the origins of the new dance step, Madison Time, are disclosed on Pine Topa Boogie. Al Smith gained experience with the Gospel DUAL-1006 Clefs and various church groups before switch- combination ing to the blues field at the insistence of Eddie Davis, the driving tenorman who lends turntable /changer support on the singer's first LP. In addition to a flexible tenor voice, Smith possesses the knack of writing original tunes in the new hybrid style that combines gospel and blues. The six heard show a deep blues feeling and are more worthy of attention titan the work of the many gospel graduates who have climbed on the hit parade. Of course, that ...compares favorably could be Smith's next stop. so collector's are advised to listen to him no,v. Shirley Scott with the best manual plays the organ. along wiiI bassist Wendell Marshall and drummer A nliur Edgehill.

-'+r tables in all respects. Freddie Redd Quartet: The Connection Rumble, both lateral and Blue Note 4027 ver- If visitors to The Living Theatre's off - Broadway production of "The Connection" tical, was exceptionally low. . . It has, further, are disappointed in not finding a sensational exposé of narcotics addiction, apparently they are satisfied enough by the experience to pasa an arm that tracks exceptionally well at track- the word along to friends. In spite of mixed reviews, the play has just embarked on the ing forces equal to those of fine second year of its run and Freddie Redd's transcrip- music, which forms an integral part of the action, is nov available as performed by the tion arms. If you desire. .. automatic (changer) musicians in the cast. The composer took on the difficult tusk of describing the varying states of mind which Jack Gelber has his features...and also wish the finest turntable - characters assume as the play progresses. At the saine time, the music must seen impro- arm performance, then the Dual is as close vised by jazz as well as theatrical standards. The result also is likely to disappoint the listener who expects melodramatics. Ner will to this ideal as can be had." it please the cool, hip nightclub audience which resents being carried below the surface of emotion. Forced to avoid outward mani- festations of joy, anger, or hope, Redd relies Write for complete reprints of this and other reviews from such publications as Audio, Electronics oit the blues to express inner truths that the World, Popular Electronics and Hi Fi Systems. Better yet, visit your authorized United Audio author can only hint at in words. There can dealer and learn for yourself why the Dual-1006 is so widely acclaimed as being in a class by itself. be no doubt that his work benefits greatly front Redd's sympathetic approach. OPERATING FEATURES OF THE DUAL -1006: Fully automatic changer operation Unrestricted The restrictions imposed are not so strin- single play, manual or automatic Free -floating tonearm tracks and trips at as low as 11/2 grains Tracking force varies less than .5g from first to tenth record Foolproof record indexing princi gent as to preclude humor on Wigglin', de- pie intermixes all size records Elevator- action changer spindle functions without pusher arms or termination on Music Forever, and tenderness stabilizers Built -in stylus force gauge Four speeds: 16, 33, 45, 78 Rumble -free precision motor on Theme For Sister Salvation. Besides being Automatic drive wheel disengagement Multi- purpose stereo /mono switch Price: 879.95 an ideal choice for the alto -sax part, Jackie McLean still makes his solos seem freshly minted. Joining Redd at the piano in the rhythm section are bassist Michael Mottos and drummer Larry Ritchie. As the music re- quires all the personal Involvement the lis- united udio tener can give, those unable to view a per- to read play, now PRODUCTS formance are urged the OF DISTINCTION readily accessible in a paperback edition. 12 -14 West 18th St., New York 11, N.Y. 2E

73 AUDIO AUGUST, 1960 OUTPUT OUTPUT TAPE GUIDE

(from pagr 3-1) INPUT LOSSER INPJT NETWORK cps. Yet, as shown in Fig. 11, NAB equalization calls for bass boost to start at 3180 cps. How does one reconcile this FOR BASS BOOST: seeming contradiction? The answer, in \\ PREDOMINANTLY SHORT- CIRCUITS broad terms, lies in the fact that, within FREOUENCY-DISCRIMINATING THE HIGH FREQUENCIES SHORT-CIRCUIT TO GROUND FOR TREBLE -BOOST: a certain range, various playback equali- PREDOMINANTLY SHORT-CIRCUITS zation curves prove feasible at a given THE LOW FREQUENCIES tape speed. In other words, the point at which bass boost reaches 3 db, known as the turnover frequency, can vary within Fig. 15. How losser equalization works. a fair range and still permit relatively flat response through suitable adjustment playback equalization may be optimum with minimum distortion and maximum of record equalization. in the sense of combining flat response signal -to -noise ratio. At any given tape When the bass turnover frequency is changed, this in turn changes the re- quirements for record treble boost in order to achieve more or less flat re- HERE'S THE YEAR'S BIGGEST NEWS IN STEREO sponse. If the bass turnover frequency ...and look at the price! is lowered, less record treble boost is needed. When the bass turnover fre- quency is increased, more record treble boost is required. In sum, the amounts of playback bass boost and record treble boost vary in the same directions. The ad- vantage of more record treble boost is that more signal is recorded on the tape, resulting in a better signal -to -noise ratio; the disadvantage is that the greater amount of record treble boost raises the Stereo Recorder Monaural Recorder danger of excessive distortion. Sound on Sound Recorder Figures 13 and 14 serve to clarify Plays Half Track how it is possible to employ various com- and Full Track Monaural binations of playback bass boost and 2 Track and record treble boost at a given tape speed. 4 Track Stereo Figure 13 illustrates the situation where litnaanc: relatively little record treble boost and from playback bass boost are employed. Curve $495 A -A is the original unequalized record - playback response. Curve A -B represents w l' - , record -playback response after applica- NOW... for the first time... a tion of treble boost in recording. The t= l= - 0_, í (6 distance between Curves A -A and A -B modestly priced professional represents the amount of treble boost stereo recorder that has exciting features found only in the finest that has been supplied. Curve B -B, which instruments. You won't believe it until you see it! is a straight line, represents flat response after application of bass boost in play- FEATHER TOUCH PUSH -BUTTON OPERATION 4 HEADS, INCLUDING SEPA- back. The distance between Curves B -B RATE 2 -TRACK AND 4 -TRACK PLAYBACK HEADS 3 MOTORS, INCLUDING and A -B represents the amount of bass HYSTERESIS DRIVE MECHANICAL FLUTTER FILTER DYNAMICALLY BAL- boost that has been supplied. ANCED CAPSTAN FLYWHEEL INSTANT SOURCE /TAPE MONITORING TWO Now consider Fig. 14, where all the RECORD /PLAYBACK PREAMPLIFIERS INSTANT START /STOP AUTOMATIC curves have the same meaning as in Fig. IPS SPEEDS AUTOMATIC TAPE LIFTERS TAPE 13. Now, however, note that greater CUT -OFF SWITCH 33/4.71/2 treble boost has been supplied in record- LOCATION INDICATOR SEPARATE MICROPHONE /LINE INPUTS, EACH ing (distance between Curves A -A and CHANNEL. A -B), so that more signal has been put f 1 on the tape, resulting in greater output AMERICAN CONCERTONE at the high end in playback. And note See the phenomenal DIVISION OF AMERICAN ELECTRONICS. INC. that, in turn, greater bass boost is re- CONCERTONE 505 9449 West Jefferson Boulevard quired in playback (distance between Culver City, California Dept. AUD -8 Curves B -B and A -B) in order to achieve at your dealer, or send Gentlemen: - Please send your illustrated brochure on the new CONCERTONE the coupon for a flat response. 505 STEREO RECORDER, and the name of nearest dealer. descriptive brochure and Name Change of Equalization with Speed the name of your Address Possibly Fig. 13 or 14 or some inter- nearest dealer.

City - Zone State mediate combination of recording and -

AUDIO AUGUST, 1960 71 speed there is only one optimum combi-

OUTPUT OI:TPUT nation. Since a given playback curve implies complementary recording equali- zation that will achieve INPUT INPUT flat response, it may be stated simply that at each tape speed there is only one playback equali- zation curve which FEEDBACK represents optimum NETWORK performance. The foregoing statement should not FREQUENCY -DISCRIMINATING be taken too strictly. Thus FOR S it has been CANCELLATION OF THE INPUT SIGNAL BA BOOST: PREDOMINANTLY FEEDS BACK found that NAB playback equalization, THE HIGH FREQUENCIES considered ideal for 15 ips, can also be FOR TREBLE BOOST: used very PREDOMINANTLY FEEDS BACK satisfactorily at 7.5 ips. True, THE LOW FREQUENCIES a moderate departure from the NAB I curve at 7.5 ips may yield better results Fig. 16. How feedback equalization works. in terms of distortion and noise; how- ever, the improvement would be a slight one. Going down the speed scale, namely to 3.75 ips and lower speeds, we arrive at situations where NAB equalization in playback would entail a serious sacri- fice in performance. Thus a quality tape machine will accompany a change in tape speed with a change in playback equalization when the speed change en- tails going below 7.5 ips. In some LA RIES TONE A tape machines, however, for reasons of econ- omy, the sanie playback equalization is used for both 7.5 ips and 3.75 ips. The equalization employed may then be NAB or it may be an intermediate curve part way between the NAB one and the opti- mum curve for the 3.75 ips speed. From earlier discussion it is obvious that as speed is reduced, greater treble boost is needed in recording to overcome the increased high-frequency losses. In other words, a reduction in tape speed also calls for a change in recording equalization. However, this is not always done. In some of the less expensive ma- chines, the manufacturer may aim for response extending to about 15,000 or 16,000 at 7.5 ips, which means that with- out any change in record equalization response will extend to about 7500 or 8000 cps at 3.75 ips. Response extending to about 8000 cps surpasses the per- formance of most AM radios and per- mits a fairly good quality of reproduc- Gunstock walnut wood Vertical azimuth adjustment tion, pleasing to many persons. Thus Smaller in size and mass Interchangeable cartridges the manufacturer may consider that re- Vertical balance adjustment Adjustable overhang alignment sponse to 8000 cps still gives the indi- vidual Lateral balance adjustment Completely wired to preamp a good run for his money. (It isn't so many years since high -quality Tracking force adjustment, Ultrafine shielded cable a tape recorders offered response to only about 8000 cps 7.5 ;:::LABORATORY SERIES TONE ARM $3'. at ips.) In a number of tape machines, despite th Odom Cartridge $6930 With Master Ca_rtrtd e $85.00 - their ability to extend response to 12,000 Custom Cartridge $32.50 -Master Cartridge WIC-Micro Tone Arm $29.9 cps or better at 3.75 ips, there may be little or no change in record treble boost compared to that employed at 7.5 For further information write: GRADO LABORATORIES, INC. ips. Instead, these machines reduce the 4614 Seventh Ave., Brooklyn 20, N. Y. Export - Simontrice, 25 Warren St., N. Y. C. amount of bias current when the tape machine is shifted to the lower speed. This reduces the high -frequency loss due

72 AUDIO AUGUST, 1960 to bias erase. Some tape machines em- ploy a combination of methods, namely a change in record treble boost plus a i,rot'' change in bias current. Generally, it is N MARILYN KING sought to avoid treble boost at 3.75 ips of the famous King Sisters, substantially greater than that at 7.5 4)4 Capitol recording stars ips, for there is too much danger of running into tape overload. Decreasing bias current entails an in- crease in distortion. Hence in recording at 3.75 ips with a machine that employs the latter technique it is advisable to re- duce the recording level by several db. Experience will tell the operator how much to reduce level. In machines which do not reduce bias current but rely on an increase in record treble boost to achieve extended response at 3.75 ips, it is similarly advisable to reduce recording level to avoid possible overload at the very high end.

Equalization Circuits Equalization circuits are of two basic kinds : losser and feedback. Losser equalization, illustrated in Fig. 15, in- volves the principle of short -circuiting all frequencies to ground, but with some frequencies short -circuited to a greater degree than others, so that in relative terms bass boost or treble boost is achieved. Thus if treble boost- is desired, a loss is produced at all frequencies, but with the loss growing progressively less as frequency rises. Conversely, if bass boost is desired, the losser circuitry pro- duces more of a short- circuit at high fre- quencies than at low ones. In the case of feedback equalization, the principle employed, as shown in Fig. 16, is to take the signal from one stage of an amplifier and apply it to an earlier 4 -TRACK STEREO stage, thereby cancelling part of the original signal, so that over-all amplifi- TAPE RECORDER cation is reduced. The signal fed back to the earlier stage goes through a network is YOUR BEST BUY! that favors either the low frequencies or the high frequencies. If bass boost is desired, the network admits the high fre- Only ROBERTS "990" combines these eatures: quencies more easily, thereby cancelling the highs to 'a greater extent and achiev- "Instant" multiple Dual head outputs ing bass boost in relative terms. If treble adjustment head boost is needed, then the network admits Dual pre -amp outputs 4 -track stereo record /play the bass frequencies more easily. Dual power amplifier outputs There are pros and cons for both 4 -track monaural record /play losser and feedback equalization circuits. Dual monitor speakers 2-track stereo playback Feedback circuits are claimed to achieve Portable and easily custom installed less distortion. Sometimes they may also serve important ancillary purposes, such ROBERTS ELECTRONICS, INC. as reducing high- frequency losses. On Send for Roberts' 829 No. Highland Ave., Los Angeles 38, Calif. Dept. D the other hand, it is claimed that losser great new Stereo Please send me your Stereo Tape Information circuits, with suitable design, can be Tape Information Kit. Kit. 34 tape application NAME about as distortion -free. Above that, they methods described. can generally provide more exact equali- Includes the sensational ADDRESS zation, and this equalization tends to be Roberts Pictograph. CITY more immune from the effects of tube Enclose 25t' for handling STATE and postage. aging. Æ Endos- 254( (atampa, each) for handling. pe,tagr

AUDIO AUGUST, 1960 73 LIGHT LISTENING

(from page 8)

sion albums that have been racking up enor- won his greatest fame in Hollywood musicals, mous sales in the past few months. Such are the featured attractions. Since Senores albums have replaced the trains and racing cars Cardenas and Gonzalez are listed as the re- we had in the early days of the stereo disc. cording engineers in the production staff cred- Oddly enough, the ping pong antics devised its, we can assume that the singers had every by Chuck Sagle for the far -flung percussion reason to feel at ease during the sessions. The section of this informal orchestra are less dis- stereo miking pattern is quite similar to our tracting than some of the side-to -side effects own on the evidence of this recording. Musi- in this month's choral or dance band releases. cally, more than one Latin American country The tunes are old reliables -Sheik of Araby, is represented but Mexican songs well known Who't Sorry Now, Muskrat Ramble. The sound in the United States are the backbone of the is easily the greatest excuse for buying the album. record. It is very clean in areas of the spec- Devotees of folk music are bound to con - trum that most stereo discs do not attempt aider the style a bit too slick but local color to enter. will carry the day for the general listener. In my review copy, there was sign of overloading during loud passages -a blemish not found in Les Elgart: The Band With That Sound the other Medallion discs. Columbia CS 8245 The dance orchestra directed a few years Pat Suzuki: Looking At You ago by Les and Larry Elgart was universally RCA Victor LSP -2186 respected for the vigor of its individuality and the precision of its ensemble. Then the Elgarts The star of the recent Rogers and Ham- decided there was talent enough with the merstein Broadway musical "Flower Drum group to form two orchestras. Larry went over Song" returns to the style of the opening phase to the RCA Label with a band of his own of her career with this collection of ballads. while Les remained at Columbia. Several ex- Four years ago, as an unknown singer in a cellent stereo discs have been issued by Larry's Seattle night club, she was heard by Bing orchestra but this is the first stereo recording Crosby in the type of song she offers on this I've heard featuring the Les Elgart organi- record. When he recommended her to Victor's zation. Of the two bands, I must confess that recording executives, it was on the basis of Larry currently offers the more arresting ar- her ballad style. It was then decided that rangements for living room listening. It would most of her subsequent career be devoted to seem that he had charge of the individualism brassy tunes with an application of just in the old band. The relaxed heartiness of the enough Oriental burnish to set them apart Les Elgart beat is still ideal for dancing but from the work of other vocalists. Now, with the miking and the arrangements heard on this the help of ' unassuming arrange- record are far too channel-conscious for my ments, the other half of Pat Suzuki's person- comfort. You can get away with anything these ality has a chance to live it up quietly with days if you're turning out a novelty record songs such as My Funny Valentine and I See for the stereo novice, but the tossing around Your Face Before Me. the melody gets here makes no more sense than it would in the ballroom. Unless your neck needs the exercise, get the mono version. Del Wood: Flivvers, Flappers and Fox Trots RCA Victor LSP 2203 at Harrah's Club AIWA Guy Lombardo The major recording centers-New York Capitol ST 1393 and the West Coast- apparently do not domi- one feels com- Sampled a large and brawny stereo sys- nate all facets of the art. If UNI -DIRECTIONAL on an unthrottled revival of tem, this release may stump a few listeners pelled to produce the Twenties, the Nashville studios of RCA who haven't paid much attention to Guy Enshrined RIBBON MICROPHONE Lombardo's stereo recordings. The average sup- Victor is a good place to start. recording purposes, there, under the custody of Del Wood, is a MODEL per club, when used for coax out usually contains its livest sound at the cus- tear -stained ragtime piano that can VM -18 Club the real flavor of Bye Bye Blackbird, Varsity tomer's tables. On the stage of Harrah's se- Nevada, the Lombardo crew Trot, and Tiger Rag. The small orchestra, nt Lake Tahoe, as skill, is Features: an environment lected for determination as well has chanced upon acoustical makers. you're a " Small size and slim shape facilitate among the month's loaded with snappy noise If that's one of the surprises occasional intrusions handling. releases. A might present a prob- glutton for memories, the swing band far too few. These in- were be used in a by the chorus will seem Comparatively high sensitivity and lem if the same mikes to you love me when my this liveness. In Lombardo's case, this clude such gems as IViU fine response characteristics. room of busted?" Recommended for light- 1s stereo that does jus- carburetor's Sturdy construction with short ribbon the first recording In listening. tice to the bass foundation of the band's lower headed diaphragm. reed and brass instruments. The lineup of " Humming minimized. Guy tunes offers a wide sample of the music The New Moon, White Horse Inn, and with a low frequency atten- is playing these days. The next time I put on Equipped Epic BN 566 uation circuit. the disc, (when introducing Aunt Hannah to The Girl Friend the delights of stereo) I'll skip the band with very fanfare, Epic's light music and the group With little the two pianos in Humoresque has been turning out a polished serles by the club audience. On division Specifications: of songs contributed of albums devoted to excerpts from the great Type: Ribbon Microphone the plus side, there are the newest additions and operettas of the past. Look Away musical comedies Impedance: 600 ohm ± 20'7, to the Lombardo library -Love, The repertory company heard In the three rec- from "Flower Drum Song" and Carmen Lom- O of ords issued so far includes the Michael (At 1000 c/s at point bardo's latest tune Return To Me. the switch) Semmes Singers and Johnny Gregory's or- The leading roles are sung by Doreen db (Odb = 1V, m bar chestra. Sensitivity: 7S Companeros de Mexico: The Sound of A Hume and Bruce Trent. Were these enthusi- 1000 c /s) less tal- Chorus astic young performers considerably " Directionality: Uni- directional than they are, these new productions Medallion MS 7503 (© 47003) ented Noise Level: Below 30 db would still be welcome because the catalog has recent sampling of Jerome Kern's Dimensions: 9 3/8" (length) 1 1/2" The Medallion label is a new product of no other Fiddle" or Vincent You - (dia.) Weight 2.2 lbs. (9 Kapp Records. It is aimed, with elaborate "The Cat and The prac- man's "No, No, Nanette" or "Hit the Deck." -cord & Included) pledges of good behavior in engineering feet plug tice, at the listener equipped to properly ap- The score from "Hit the Deck:' is in the lime- preciate such behavior. Their first release light on the East Coast this summer during shows promise as well as problems that should the open -air revival of the show at Jones C future albums. This recording Beach. The first two releases in this series AIWA evaporate in third was made below the border in the studios of were issued in mono only. Stereo, in this 601 West 26th Street RCA Mexicana. A native male chorus and the one, emphasizes the quaintness of show music 1£ New York 1, N.Y. noted Colombian baritone Carlos Ramirez, who of the Twenties.

74 AUDIO AUGUST, 1960 BUYER'S GUIDE (front page 58)

DYNACO Stercodgnc II Cartridge. Utilizing the vari- able reluctance principle, this cartridge made by Bang and Olufsen of Denmark is designed for superior reproduction from either mono or stereo microgroove records. It lins a frequency response from 30 to 15.000 cps ± 2 db, compli- ance of 5 x 10-e em /dyne, and an output of 7 mv per channel for a stylus velocity of 5 cm /sec. Channel separation is better than 22 db, and tracking force is from 2 to 4 grams. Recommended load is 47,000 ohms for rated frequency response. The unit employs an un- usual construction, with the entire moving

element being enclosed in a plastic cone permanently attached to a metal shell sur- rounding the body of the cartridge. It is mounted at an angle. as shown. The mechan- ism consists of a light mumeLH cross which is attached to a slender aluminum tube with the stylus affixed to the end. Four terminals. User net price. $29.50. TA -I2 Unitized Arm -Cartridge. A similar the cybernetically engineered pickup to the Stereodyne II is united with a novel arm for use with turntables to work with minimum stylus force, which is adjust- able. Unit mounts in a single hole. Distributed professional stereo tape recorder by in the U. S. by Dynnco Inc., 017 N. 41st St., Philadelphia 4, Pa. User net price, $49.95. ELECTRO -VOICE Magneramic 31MD -5 Stereo /Mono Car- tridge. Employing ceramic elements in connec- tion with a special printed circuit which is NEWCOMB an integral part of the cartridge, the Mag- You now have your neramic 31MD -5 is designed to be fed into choice of either quarter -track (Model SM- 310 -4) or half -track the usual magnetic pickup inputs of stereo (Model SM -310) versions of the exciting new stereophonic recorder preamps. Frequency response is given na 20 tape by Newcomb. Specifications for the two are identical. They are deeply satisfying to work with because they are cybernetically engineered. That is, controls are so ar- ranged that the natural thing to do is the right thing to do. Tape movement is con - trolled- by a central joystick...the easiest machines to operate you've eyer.tried..._ easiest on tape, too. Broken, spilled, stretched tape are things of the past when you work with a Newcomb recorder. And few, if any, machines include such a wealth of features. Newcomb recorders take any reel size - 3" to 10%". They have twin, illuminated recording level meters arranged pointer -to- pointer for instant compari- son, four digit counters, mixing controls for "mike" and "line" for both channels, balance control, ganged volume control, two speeds - 7% or 33/. inches -per- second with automatic compensation for 33/. The Newcomb to 20,000 cps ±2 db, with a channel separa- tape machine is designed to be tion of 28 db at 1000 cps and an output of an inseparable, dependable, indispensable companion for the serious recordist. Write 10 mv. Compliance is 3.5 x 10-0 cm /dyne and the cartridge is available with either 0.5- or fo,- the complete story contained in Bulletin SM -3. 0.7 -mil styli, the former being recommended for use with transcription arms with a stylus NEWCOMB AUDIO PRODUCTS CO., Dept. T -8, 6824 Lexington A ve., force of 2 -4 grains. The cartridge is also Hollywood, Calif. available for ceramic inputs. Electro Voice. Inc., Cecil and Carroll Sts., Buchanan, Michi- gan. User net prices: Magneramic 31MD -5, $24.00; same, for ceramic inputs, $22.50. FAIRCHILD Compatible Rotating- Magnet Cartridge. r Model SM -1 is n moving -magnet pickup of unusual design. The stylus bar extends from ?-- - a precision- ground rubber "ball" in which the PORTABLE STEREO SPEAKER SYSTEMS - Peur chromes an offered. varying in site and efficiency. The latest technidues are used to reproduce big bass In compact space and to r achieve unprecedented audi- ence coverage. Speakers have Model SAJO portable 2. channel amplifier is kickprooi metal grilles. carrying ( powerful and worthy Companiin to the New. handles. end ere covered in comb Recorder, ... 40 watts pesk per channel scratchprool. washable. warm 1 ..ganged contras - ass. treble. volume. bal. gray fabrikoid to maten the Lonce ....ells clore in cover. SA40 and SM310.

AUDIO AUGUST, 1960 75 magnet is mounted, (the ball constituting the and the latter at 5 -7 grants. Frequency re- suspension and damping), generating the sig- sponse. 20-20.000 cps + 3 db for the VR225. nal in two sets of coils. Frequency response and 20- 17,000 cpa ±3 db for the VR227. is from 20 to 15,000 cpa +2 db, and output Channel separation is up to 30 db at 1000 is 11.5 mv for a stylus velocity of 5 cm /sec. cpa. and output is 9 mv for a stylus velocity The unit has a d.c. resistance of 2000 ohms of 5 cm /sec. Inductance of the unit is 420 mid. and an inductance of 0.5 Hy, and is designed nominal, and resistance is 1600 ohms per to operate into a load of 47,000 ohms, with channel. Recommended load resistance is 47,- any value from 39,000 to 100,000 being ac- 000 ohms. Lateral compliances are 4 x 10- ceptable. Recommended tracking force is 3 -4 and 3 x 10-' cm /dyne and vertical compliances grams. Channel separation is better than 25 are 2.5 x 10-a and 2 x 10* for the 225 and 227 db at 1000 cps, and compliance is 4 x 10_a. respectively. Audio Components Section, Gen- Because of internal copper case for electro- eral Electric Company. Auburn. N. Y. User static shielding and a =metal outer case, net prices : VR225, $27.95 ; VR227, $24.95. the hum is extremely low. being 65 db below the signal when mounted on the turntable. Fairchild Recording Equipment Corp.. 10-40 45th Ave., Long Island City 1, N. Y. User GOTHAM net price. $34.95. Double Dynamic Sterco Cartridge. Said to be the first stereo cartridge, the Neumann Model DST features a low impedance (18 GENERAL ELECTRIC + 2 db to 15,000 cps. The shielding has been ohms) and is designed to work into a load Variable Reluctance Stereo Cartridge. With improved. and the grounding of the shield and of at least 50 ohms. Channel separation is a series of small changes in the design, the the method of shorting the two "ground" over 30 db in the midrange and is greater new VR -22 stereo cartridge is even better terminals are well thought out. Avnilable in than its predecessor with respect to output, two models, VR225 with 0.5 -mil stylus and channel separation, and extended frequency VR227 with 0.7 -lull stylus, with the former response. and the two channels balance within tracking at 2-4 grams in transcription arms for the money 2 circuit by tubes by PoIot' : Amperex

tha:, 12 db at 10,000 cps. Output is 1.05 my for 7 -cm /sec velocity, and the unit is in- tended to track at 6 grams stylus force. Fre- quency range is from 30 to 15,000 cps, ±2 db. The DST cannot be mounted in most arms. but will fit directly into SME anus. Gotham Audio Corporation, 2 West 46th St., New York 36, N. Y. User net price, $69.00. GRADO Moving-Coil Stereo Cartridges. Made in two models, the Custom for use in record changers and the Master for turntable use, these cartridges are similar in design. Both employ a moving element consisting of a hollow plastic cube on which are wound two coils and from which extends the stylus bar. This cube is supported in a rubber "grommet" which serves to hold the coils in the magnetic, field as well as provide the necessary damp- ing. The specifications given are for the Cus-

For the discriminating audio enthusiast who has been searching for high quality at a moderate cost, the new PILOT "602" Stereo FM /AM Tuner -Preamp- Amplifier is a most logical choice. Here is extreme FM sensitivity - assured by the Amperex 6AQ8 /ECC85 dual-triode. To reduce hum and noise to complete inaudibility (and to prevent microphonics) -5-12AÁ7 /ECC83's. For precise and effortless tuning -the 6FG6 /EM84. For distortion - tom and Master series respectively. Frequency free power -4- 6BQ5 /EL84's. For absolute dependability response, 10- 24,000 cps and 10- 30,000 cps. - Amperex throughout! Interchannel output balance, 0.5 db on each; These frequency balance, 0.5 db each. Output, 3.5 and many other Amperex `preferred' tube types may and 2.5 mv respectively at a stylus have proven their reliability and unique design advan- velocity of 5 cm /sec. Impedance. 1000 and about hi -ti tages in the world's finest audio components. 700 ohms ; Tracking force, 3 grants each. tubes Input load, any value over 5000 ohms for for hi-fi circuitry Applications engineering assistance and detailed data both models. Channel separation, in excess of are always available to equipment manufacturers. Write: 20 db and 25 db. In addition, the Master Amperex Electronic Corp., Special Purpose Tube Divi- series is fitted with a radioactive element to reduce static accumulation on the record sur- sion, 230 Duffy Ave., Hicksville, Long Island, New York. face. Grado Laboratories, Inc., 4614 Seventh AMPEREX TUBES FOR QUALITY HIGH-FIDELITY AUDIO APPLICATIONS Ave., Brooklyn 20. N. Y. User net prices : Custom, $32.50 ; Master, $49.50. POWER AMPLIFIERS RF AMPLIFIERS INDICATORS 6CA7 /EL34: 60 w. distributed toad REM Frame grid twin triode 6F66 /EM84: Bar pattern 7189: 20 w., push -pull PICKERING 6ER5: Frame grid shielded triode IM3/5M70: Subminiature "excla- 6BQ5 /EL84: 17 w., push -pull SE11T /EF183: Frame grid pentode mation" pattern for SCWS /EL88: 25 w., high current. Precision Pickup Cartridge. Designed low voltage for IF, remote cut -off the discriminating record collector, the Model SEMICONDUCTORS of excep- 68M8 /ECL82: Triode-pentode. 8 w., 6E17/EF184: Frame grid pentode 380 is a moving- magnet cartridge push -pull for IF, sharp cut-off 2N1517: RF transistor, 70 me 6AQ8 /ECC85: 2N1516: RF transistor, 70 me VOLTAGE AMPLIFIERS Dual triode for FM tuners for pre 2N1515: RF transistor, 70 me 6267/EF86: Pentode -amps 6DC8 /EBF89: Duo-diode pentode 12A77/ECC81: )) Twin triodes, low IN542: 12AB7 /ECC82:j hum, noise and RECTIFIERS Matched pair discriminator microphonics. diodes 12AX7 /ECC83: 6V4 /EZ80: Indirectly heated, 90 mA 6818 /ECFIIO: High gain, triode - IN87A: pentode. low hum, noise and 6CA4 /EZ81: Indirectly heated, 150 mA .AM detector diode, microphonics 5AR4/6234: Indirectly heated, 250 mA subminiature

76 AUDIO AUGUST, 1960 t ionnlly smooth rest se. 1t is lit ted Willi a removable stylus assembly which comprises the only moving clement and which can be SENSITIVE replaced instantly without tools. Two types are available, one for use with trauseriptlon H. H. Scott's farnouF type arms and the other for use in record Wide ehiutgers. Compliance is high, and the car- -Band Circuitry FAMOUS tridge is practically insensitive to minor makes this the most sen- record warp. Ihtt put is 11 1111r1xi11u1 101Y 12 my sitive tuner available for H. H. SCOTT per channel fur .r cm /sec. Pickering & t'oni under $180! Usable puny. Inc.. Plainview, S. T. User net pric. (runt $29.s5, depending upon stylus sensitivity 2.5 uy (IHFM QUALITY standards). H. H. Scott's DRIFT FREE Model 381, calibration standard $48.00 unique wide -band trans- The same silver. plated Mk 1 1, Pro-Standard Series 24.00 You never have to retune formers separate sta- the station, whether it's Wide-Band front end . PRIMO tions so close together strong or weak. Exclu- the same copper bonced you were never abe to sive H. H. Scott Wide. to aluminum chassis ... Sierro 1-nri,, bic !Murton., Cartridge. The listen to them before Band design keeps the the same Wide -Band de. nee ea rt ridge model Trina variable relnctat tector found in all H. H C -58 is n high- enmpliauee pickup with :t stylus station in tune without I rnekiog forre of :t to 4 grams. Frequency the need for distortion Scott tuners. producing A.F.C.

range i* _n to 17nu i cps :uei 1'1111111,1 Sella Nt- cps. h iun i, 21 di, at lom' Conlpli:rrm is 1.4; lo' rm drue 1.11 6 e,.rtirallp and later- ally. Snppli.d wish a ii.7 tutl diamond sir lus. Power oalpnt is ti millivolts at an stylus velocity of 5 rnl sec. Prim Co.. 1.ttl., 221143 Mure, Alitaika Ad. Tokyo. Japan. H. H. SCOTT Cartridge for l'in l age 75 Records. I y.velopoti jointly by London Hero rds and II. I1. Scott. Inc.. the new 7S -rpns cartridge has a :t -mil stylus 11 1111 IS ill lervb+11igeam t, ou the I3on111111- S1.113 t arm with t1e \lod.1 1111111 ,tertio ear. !ridge. An ideal pickup for the owner of a new TUNER H.H.SCOTT WIDE BAND $114.95*

Here at last is an H. H. Scott Wide -Band FM tuner at a modest price. The new 314 ranks with the very finest FM tuners available. H. H. Scott's exclusive Wide - Band design delivers more distortion -free sensitivity; long range reliability; better collection of 7n's. t he new cartridge provides excellent sound from the older records. Stylus station separation, even when measured by stringent IHFM standards. The fine pressure is automatically adjusted when the 7s bend is slipped on the London -Scott arm. performance of this unit is made possible by the use of special Wide -Band circuit Frequency range is 20 to 20,1100 cps. If, II. H. H. Scott. The new 314 measures a Scott, Inc., 111 l'owdermfll Itd., Maynard. components manufactured exclusively for Mass. User net price, $59.05, compact 15% wide x 51/a high x 1314 deep. Listen to this fine tuner at authorized Model 1000, cartridge $89.95 ster H. H. Scott dealers everywhere. You'll be amazed at the fine performance it SHURE offers at this exceptional price. 1Vesf of Rockies $116.95 Prof essias ra i, Custom and Standard Dpnrl- i,s. The Shore Standard 11}- !.tic model MSI)

Get The Most Out of Your Records With The London /Scott Matched H.H. SCOTT Stereo Arm and Cartridge! N. N. SCOTT. INC., 111 Powdermill Road, Dept. A -8 Maynard, Mass. z Please rush me complete technical specifications on your new 314 Wide -Band FM tuner. C Also include your new catalog and award winning booklet "Now To Use Nigh Fidelity Components in Your Decorat- "Best pickup, barring none, regardless of ing Plana". price."-Ili Fi Systems Name "The London -Scott is still without a serious Address rival." -Saturday Rct icw City State ne plus of stereo cartridges." "The ultra - W. St. N.Y.C. (apart. Telesco International. 36 40th (Continued on page 88) The Gramophone RECORDS SOUND BEST with yinc Ó Bó STEREODYNES HAROLD LAWRENCE

Choose either the Stereodyne II (mounts in all standard arms) or His Maestro's Voice the slim, trim TA -12 arm -cartridge combination for the most natural T. REHEARSAL was proceeding smoothly. between conductor and singer here. One of sound from both stereo and mono The orchestra was one of England's the latter's principal concerns is to project recordings. leading musical organizations. Sud- his voice so that it carries to all parts of denly a passage containing descending chro- the hall, and yet retains a wide range of matic runs for the violins slowed the nuances and dynamics. The conductor, too, session to a standstill. During several repe- has a large area to encompass. Not surpris- titions, the conductor sang, gesticulated, ingly, the efficiency of his work is in direct pleaded, but the expected results failed to proportion to the number players materialize. Finally, the concertmaster, in of reached the best tradition of English "leaders," by his voice. The conductor who has diffi- came to the rescue: turning slightly in his culty making himself heard beyond the chair, he directed the following words to inner ring of first desk musicians is in the stands behind him -"If you can't play trouble, for the more remote player who it, don't." The advice, proposed with such is not addressed directly is not likely to refreshing candor, was effective. At the raise his hand and ask the maestro to re- next attempt, the violinist with the sticky peat his remarks or to speak louder. In- fingers mimed his part when be reached the stead, he will probably shrug his shoulders, danger zone and the troublesome bars converse with his colleague, or read the emerged clear as a Heifetz scale. magazine or newspaper which he has The preceding incident illustrates an propped up on his stand. When necessary, especially happy relationship between con- the concertmaster may repeat certain key ductor and players in which each recognizes instructions in a loud voice so as to avoid the fact that there -are times when, to para- phrase Ruggiero Ricci's remark to a violin any ensemble catastrophes. It is interesting, too, that an orchestra class, "the hand runs cold." Co- operation hears what wants to hear. A of such a frank nature is possible, of it soft spoken course, only when there is mutual respect conductor of few words- Leopold Sto- kowski, for example, has between the orchestra and its musical direc- seldom to com- pete talk or tor. The ingredients which make up such a with other extra-musical ,.r° - relationship are the subject of numerous sounds. His rehearsals are conducted with economy: few words `s^ books on the and technique of conduct- the utmost a directed _-...+r'' art toward an ing. But much can be learned, too, from instrument or section to indicate regular attendance at orchestral rehearsals. color, phrasing, intensity, bowing, and the DESIGNED TO THE HIGHEST The conductor's the hall stamp of his personality is plainly felt. It entrance into at note rehearsal time is always a revealing mo- is remarkable to how the orchestra DYNACO STANDARDS noise level ment. If one were to calibrate the level adjusts its so that it can hear * unequalled performance of talk, random music and general hubbub his softest comments. Antal Dorati is also audible all times during rehearsals, al- * outstanding engineering of an orchestra settling down to work, one at though his voice is a cornet to Stokowski's * unsurpassed value would surely discover that there is a cor- relation between discipline and noise. is viola. Of Dorati's voice, a member of the It London remarked, Rigorous safe to predict that the conductor whose Symphony Orchestra laboratory testing of "You can't away from And initial presence in the hall fails to bring get it." what every unit assures a voice is! is rapid, ar- that your about a sharp decline in chatter and clatter it Dorati's speech and amazingly varied in expres- cartridge will exceed every will have difficulty in shaping an effective ticulate, sion. Neither conductor wastes performance. The rehearsal which begins on words; specification. comment is meant to produce a note of quiet attention, on the other every results. This not who Smoothest response: ±2 db from 30 cps hand, is almost bound to be a healthy and is to say that conductors to }5 KC. With standard Westres IA turn out great performances are always test disc. fruitful one. There are many ways of evok- economical in their work methods. Shortly ing an alert response on the part of the True stereo: More than 22 db channel World War William Mengelberg players. Charles Munch tells of the conduc- after I, separation effectively maintained through- was rehearsing his out the audio spectrum, with accurate tor of an amateur orchestra in Strasbourg famed Concertgebouw balance and proper phase relationship. who hung a big bell from his stand and Orchestra in Beethoven's Coriolan Overture. After conducting the first two notes of the Superior tracking: highest compliance, rang it furiously at the beginning of each low mass, plus he rapped his baton exclusive symmetrical rehearsal to let his presence be known. work, and delivered a push -pull design for minimum record wear lengthy talk on the music of Beethoven. and lowest distortion. There are other methods. First and fore- most, the conductor must inspire trust, not Once again, he began the work, stopped Complete freedom from hum. once more the note necessarily in what he is about interpre- after second to add some Beethoven. Hear and compare it at your tively, but in his ability to translate into further verbal notes on Following repetition the first two favorite dealer's showroom. succinct orchestral terms his concept of a another of given work. notes, Mengelberg then summoned the con- Write for complete specifications men For this purpose, a good voice is essen- certmaster to his side, and the two pondered the significance of the opening tial. It can be loud or soft, rough or gentle, DYNACO, INC. bars. At least thirty minutes passed before demanding or coaxing; but, above all, it the 3912 Powelton Ave. Phila. 4, Pa. must be audible. There is a close analogy the orchestra reached the third note of CABLE ADDRESS: DYNACO, PHILA. overture. The performance at the concert 26 W. 9th St., New York 11, N. Y. was no doubt an excellent one, despite the

78 AUDIO AUGUST, 1960 Maximum fact that so much time was spent in "ex- range planation" and so little in actual playing reproducer - 30 cps to at the rehearsal. But this was certainly be- well beyond cause lUengelberg was the orchestra's per- audib city manent conductor. Nowadays, with the pattern of fewer rehearsals and more guest Only 18" x 24" x 41" appearances, most conductors cannot afford thin the luxury of discussing the philosophy of a composer or of a musical work. They must get down to business, or else rut the ri of producing a less than meticulous pct. fermance. Too little talk can also result in ineffi- a dream cient rehearsals. In his book, About ducting, Sir Henry J. Wood wrote: ".\ from every point that drives the professional player quite mail is the conductor who is con- angle... tinually stopping to go back to so- and -so cues without explaining his reason; [it's] 'for my sake, gentlemen.'" Æ

THE " 440" BI- PHONIC COUPLER MICROPHONE CALIBRATION is The first complete full range reproducer, so radically different that it classed as a musical instrument. Like a precious violin, the Bi- Phonic I Jfuut froJc 1:1I Coupler is hand -crafted of selected woods - with the panel structure radiating bi- directionally (unlike the usual restricted "boxed -in" speakers) where: f = frequency in cycles per - reproducing the full realm of sound with acoustic depth, fundamental second tonal purity and realism. The wafer-thin Bi- Phonic Coupler beautifully blends into any decor arrangement. In mahogany, K = a constant oiled or lacquer ADVANCED ACOUSTICS CORPORATION walnut $134.40 The constant K, whose value is given 67 East Centre Street, Nutley 10, N.1. Ebony base (optional) $7.50 in the derivation of the formula in the A subsidiary of Electronic Research Associates, Inc. appendix. is not important if only a Circle 79A frequency- -re,p m.e carve is desired. Only if the absolute sensitivity of the microphone is required does K become necessary. After the sensitivity has been found why the MOVICORDER? for all frequencies of interest, select one value considered an average and plot all the other points in db, using the se- lected point as 0 db. The MOVICORDER is a precision instrument with electronic, APeExnix mechanical and construction Derivation of formula used in the text. features usually found only in Referring to Fig. 1: costly broadcast studio equip- ment. The MOVICORDER contains es= S1:p., (1) separate record and playback amplifiers, a hysteresis synchro- em SM/lo (2) nous drive motor, two custom SR= sensitivity of L1t in ahvolts where reel motors, five heads (including per dyne per square centi- meter. one for the new four track tapes), S,,, = sensitivity of M 2 VU meters, records sound many more features. po = pressure on sound plus It is truly a complete, professional However, since ea is produced by a quality stereo recorder with conductor cutting a magnetic field, specifications and reliability e,=Blv (3) second to none. For the complete where B = flux density of speaker facts on one of Denmark's finest gap, in gauss exports see the MOVICORDER at an l = length of the wire in the authorized Movic dealer or write voice coil, in centimeters direct: Dept A e= velocity of the coil, in centimeters per second. From the "Ohms Law" of mechanical circuits, MOVIC COMPANY 7 INC. 12432 SANTA MONICA BLVD., LOS ANGELES 25 CALIF.

C rc'e 773

AUDIO AUGUST, 1960 79 Add dramatic new realism to your recorded music

YOU'RE "IN With dramatic Koss Stereophones, you'll where A = diaphragm area in square thrill to new worlds of stereo sound centimeters reproduction. Your records or tapes sound Zm = mechanical impedance of just as if you had an orchestra seat in the vibrating system, in THE CONCERT Carnegie Hall. Through these comfortable mechanical ohms. Stereophones, you hear music as perfectly as it can be recorded. Add personalized Combining Eqs. (1), (3), and (4) : listening and sound perfection to your high es Bid HAIL" WITH fidelity stereo installation. $24.95. SR= = (5) po Zm Referring now to Fig. 2, the pressure p at M caused by LR located d centi- KOSS STEREOPHONES meters away is given by : rdv p =241 (6)

where t- = acoustic impedance of the atmosphere, in mechanical ohms (41.5 for air). ] = wavelength in centimeters The velocity v, for a current of i ah- amperes in L is given by: Bli Z (7) m Combining Eqs. (6) and (7) rBldi (8) 12- 2).dZm

From Eqs. (8) and (5) : rsSR P = 2d). (9)

Now the pressure p acting upon M produces a voltage em' given by : em =SmP (10)

Combining this with Eq. (9) :

Sm = 2.14,; SRri Substituting for SR from Eqs. (1) and (2), we obtain, after eliminating po:

f 2dXem em Sm = 1vß e a ri However, since i= e; by virtue of the Y 1 -ohm resistor : aruzciVERNIMMEN 2d). emei Sm =\ AMP. r e,ef STEREO But ). = v,/f, where v, = velocity of FEATURESs SM -30 (OUTPUT 15W-15W) *Can receive stereophonic broadcasts of both sound and f = frequency in cycles per SPECIFICATIONS : AM -AM and AM -FM independently at the 4- germanium diodes, 23 tubes 6B05p.p.a2 second. Thus: some time and facilitates reception of any Maximum Power Outputs 15W kind of broadcasts -AM, SW, FM. -15W 12r By pushing the "presence switch ", it can re- Frequency Characteristics s 40 c /s -'70K Sm_ l ( produce powerful low sound which has c /s, within -1db lat IOW output) tea; Lhitherto not been possible. Distortion i 1% at 14W output Easy to see "glamour magic eye" is equipped Gain (Input for 10W output )s Thus a calibration curve for the sensi- for tuning indication. TAPE ...1.23mV MAG ....3.17mV tivity of M can be obtained without By only changing the mode switch, output of MIC ....1.34mV X-TAL .... 54mV the use of a previously calibrated stand- much as 15W -15W for stereo and 30W for AUX ....74mV ard. ordinary broadcast can be obtained. Frequency Response : A highest class versatile "mammoth" amplifier 88 IOBMc /s for FM that can also be used as a crossover 3500c/s 535Kc /s^- 1605Kc /s x 2 for MW REFERENCES channel amplifier. 3.SMc f s- -,10Mc /s for SW Lord Rayleigh, "Theory of Sound." Mac- SANSUI ELECTRIC CO., LTD. Millan and Company, Vol. 1, p. 145. 460, Izumi -cho, Suginami -ku, Tokyo, Japan H. F. Olson, "Calibration of microphones by the principles of reciprocity and simi- Circle BOB larity." RCA Review, Vol. 6, July, 1941.

80 AUDIO AUGUST, 1960 DESIGNED HI FI vs. STEREO (front pane 23) FOR Our policy is to advise and guide the STEREO customer into a decision which will pro- vide the right quality of merchandise and satisfy his immediate and future BY needs at a price that is within his means, if possible. If he cannot afford the sys- tem as presented every possible substi- tution is considered with him, at the \\T,aNNOY,' same time explaining the resultant com- promise he must accept in going to lower priced components. Many times this ap- The NEW, COMPACT proach results in selling the original pro- `MONITOR' DUAL CONCENTRIC, posed system even though it means straining the budget a little. Type III LZ Honesty and a full explanation gains From a line of laboratory standard speakers comes the 10" Dual Con- the confidence of the prospect in the ma- centric - not an adapted speaker but one designed specifically to jority of cases. The same interest in and operate in small enclosures, yet provide the extended range integrated consideration of the customer must he sound source with incredibly low harmonic distortion already ac- shown in delivering and installing his claimed outstanding features of the larger 15" and 12" Monitors. system just as carefully as though it Here is a speaker with ALL the basic attributes of larger systems: were worth several times as much as he superb transients - good, solid, fundamental bass (not cabinet -simu- paid for it. Then follow up with a visit lated sound) - sustained mid and upper range frequency response or two after installation to insure that smoothly maintained beyond audibility - the TANNOY formula for all adjustments are right, and you have unparalleled presence. gained not only a customer but a friend as well, and possibly a prospect or two. Write for details to: One more point in closing. We have Tannoy (Canada) Limited Tannoy (America) Limited confused the public by making such a 36 Wellington St. East, P.O. Box 177, concentrated issue of stereo. Many a Toronto 1, Ontario. East Norwich, L. I., N. Y. prospect, wanting to be sure he gets Cure)* 81A the newest and latest in a music system, insists that it be Stereo rather than High Fidelity. There has been a sad lack of never before In Hi -Fi history explanation to the uninitiated public that has an FM tuner offered stereo is still high fidelity, only more of it in the way of components. In selling so much for so little a system such as described above it takes some time to unsell the idea that it is still made up of the same components with respect to quality as those used in stereo. Once this is done, and sometimes it isn't easy, the prospect sees the ad- vantage of progressive build -up to stereo and the small difference in cost in the end. At the same time it appeals to many to be able to enjoy the benefits and pleasure of a good hi -fi system much sooner than waiting until it can be af- forded as a complete one -time purchase.

RECORD REVUE (from page 65) Designedte for tomorrow! Incorporates both circuitry and imagine that big -name artists are quite.infal- switching for broadband multiplex operation lible, even in such an assemblage as this. They aren't. 1 could not play all of this Traditional quality S -R engineering, offering unusually record, frankly, though it has many powerful aspects inevitably, with such potent individual high stability, sensitivity, and cool operation performers. The music simply is done untold violence, in the blithe ignoring of current Full 15 -month guarantee - best in the hi -fi field trends towards a taken- for-granted authen- ticity -the accompaniment is with piano, a ASK YOUR HI -FI DEALER FOR DESCRIPTIVE TECHNICAL BROCHURE "big- name" but wholly inappropriate, for all that -and even more importantly, In the sense of style, which is utterly at variance with SARGENT- RAY1=NT CO. Bach's best interests as of today. Each of these 4926 E. 12TH STREET OAKLAND 1, CALIFORNIA singers, and each performer, renders his Bach in strictly modern high -power concert style. Circle 818

AUDIO AUGUST, 1960 81 NEW! "the best of AUDIO" No. 124 No. 120 A new compendium of AUDIO knowledge. THE 4th AUDIO ANTHOLOGY Here is a collection of the hest of AUDIO -The AUDIOclinic $2.95 Postpaid by Joseph Giovanelli...noted and the original high fidelity answer -man-EQUIPMENT PROFILES edited by This is the biggest Audio Anthology ever) C. G. McProud...Editor of AUDIO. Here is a wealth of hi -fi Contains a wealth of essential high fidelity and audio information. Answers to the most important issues know -how in 144 pages of complete arti- in high fidelity and a valuable reference on the performance of cles by world- famous authors. leading makes of high fidelity components. Volume I $2.00

1! r O O t B.. Tf-..... I L0 0 m 0 0 th R U D I NEW! Greatest Reference Work on Audio & Hi Fi No. 123 0 "The AUDIO Cyclopedialtby How.rd \l.Tremaine bookshelf Up to the minute, including stereo! 1280 pages 3400 topics 1600 illustrations A convenient service to AUDIO readers. Order your books Here is one single volume with the most comprehensive cov- erage of every phase of audio. Concise, accurate explanations leisurely by mail -save time and of all audio and hi fi subjects. More than 7 years in prepara- travel, we pay the postage. tion -the most authoritative encyclopedic work with a unique quick reference system for instant answers to any question. A vital complete reference book for every audio engineer, tech- nician, and serious audiophile. $19.95

No. 115 No. 112 McPROUD HIGH FIDELITY OMNIBOOK TAPE RECORDERS AND TAPE RECORDING Prepared and edited by C. G. McProud, by Harold D. N eilcr publisher of Audio and noted authority A complete book on home recording by the author of and pioneer in the field of high fidelity. High Fidelity Simplified. Easy to read and learn the Contains a wealth of ideas, how to's, what to's and when to's, written so techniques required for professional results with home plainly that both engineer and layman recorders. Covers room acoustics, microphone tech- can appreciate its valuable context. niques, sound effects, editing and splicing, etc. Invalu- Covers planning, problems with decora- able to recording enthusiasts. Hard Cover $3.95. Paper tion, cabinets and building hi -fi furni- Cover $2.95 Postpaid. ture. A perfect guide. $2.50 Postpaid.

HANDBOOK OF SOUND REPRODUCTION No. 110 Save over 60% with this collection of AUDIO books. by Edgar M. Villchur AUGUST 3rd Audio Anthology ($2.50) 4th Audio Anthology Right up to date, a complete course on ($2.95) McProud High Fidelity Omnibook ($2.50) sound reproduction. Covers everything best of AUDIO ($2.00) Tape Recorders & Tape from the basic elements to individual SPECIAL! R ernrdine 951 chapters of each of the important components of a high fidelity system. TOTAL VALUE OF ALL FIVE BOOKS S12.90 Regularly $6.50...offered for a limited SAVE Your cost ONLY 55.00 POSTPAID time at only $3.75. $7.90 This offer expires August 31. 1960 SPECIAL! You pay only $2.75 for this Good only on direct order to Publisher ORDER ::0S68 book when you order it with any other book on this page.

AUDIO Bookshelf RADIO MAGAZINES, INC., Dept. 58 P.O. Box 629, Mineola, New York Please send me the books I have circled below. I am enclosing the full remittance of $ (No. C.O.D.) All U.S.A. and CANADIAN orders shipped postpaid. Add 50e for Foreign orders (sent at buyer's risk). BOOKS: 110 112 115 120 123 124 0S63

NAME ADDRESS

CITY ZONE -STATE But what Is worst for me is the unmusical, bouncing, hard, brassy, Intractable rhythms, that drag the performers along against their better natures, and force all their petty dis- agreeablenesses into full play. This unhappy 10 Hi -Fi Editors and ugly ensemble must be attributed to the Great New Kits conductor, for lie's the one who should be 3 shaping and smoothing and blending the vari- ous personalities into a musical whole. acclaim the All in all. a dismally bad recording in view of the potentially noble artistry available for Stereo among these famous personalties, but I'll ad- by P A mit that the slow arias are good listening even P A O o SA -40 so, for in them the hard rhythms are less able to assert themselves, the individual perform- .. with the famous specially-prepared giant -size dia- 40 WATT STEREO ers can take their own heads, so to speak, and grams and super -simple step-by-step instructions for Preamp /Amplifier KIT express better what they know of the musical fool -proof assembly and wiring. Crafted by PACO, Kit line -which is plenty. The fast arias are the Division of PRECISION Apparatus Company, Inc.. intolerable ones. world- famous manufacturers of laboratory electronic test equipment for over a quarter of a century.

I Solisti di Zagreb Play Telemann. (Four concerti, a sonata for strings). Vanguard BGS 5028 stereo O This excellent modern-style small orchestra [;:--O O tackles five out of the ninny hundreds of works by the relatively facile Telemann, contem- The PACO SA -40 40 WATT STEREO PREAMP- porary of Bach and much better known in his AMPLIFIER The Last Preamp-Amplifler You'll Ever own day. The music, interestingly, borrows Have to Buy much of the then Italian style and is here Model SA -40 -KIT, complete with gold and satin black C. G. McPROUD played by an Italian -school orchestra of today ; cabinet. Net Price: $79.95 Editor and Publisher of AUDIO: It sounds, to me, even more like Vivaldi than Model SA -40W - FACTORY -WIRED, complete with gold it usually does. Somehow, the Italiaun aspects and satin black cabinet. Net Price: $129.95 .. fulfilled the specifications of the music are brought out here, whereas a exceptionally well... excellent German chamber orchestra would manage to performance at a reasonable make the very same music sound more Germait price ..." than Italian ! (There's a French influence in Telemann, too ; it would be good to hear n r ti French orchestra do these saute works.) Thus -0- O O do nationalistic influences continue to operate, JOHN DIEGEL even a couple of centuries after the fact. The PACO ST -45 AM -FM STEREO TUNER A Truly HIGH FIDELITY: The Zagreb players are about the best in Unusual Engineering Achievement in Stability and the business and their styling is beautifully Sensitivity overall performance ... superior suited to Vanguard's rich but careful stereo AVAILABLE THREE WAYS: to that of many amplifiers in its price milting. Some very unusual harmonies and Model ST -45 -KIT, with factory pre -aligned transform- range ... completely stable ... " drama are here, marking Telemann for what ers. complete with gold and satin black cabinet. he was, a facile composer who on occasion Net Price: 564.95 t. J could be suddenly very profound. Two oboe Model ST -45PA-SEMI -KIT, with both FM and AM tuner concerti, one tor violin and one for viola, sections factory-wired and completely pre -aligned and JIM LYONS, Publisher plus a work for strings, all of them short and calibrated for hairline sensitivity, complete with gold concise. and satin black cabinet. Net Price: $99.95 The American Record Guide: JE Model ST -45W - FACTORY- WIRED, aligned, calibrated .. met or exceeded all (its) and assembled, complete with gold and black satin important specifications ... a winner cabinet. Net Price: $134.95 . an exceptional value for the money .. . AUDIO ETC. (from page 14) r r, WILLIAM STOCKLIN in a large room. This whole three -speaker deal is provide a Hi -Fi Editor to helpful remedy in case ELECTRONICS WORLD: of stereo trouble. It won't add a thing to your music if you already have good stereo. The PACO ST -35 FM TUNER .. harmonic distortion results It'll merely subtract, by acting as a mono AVAILABLE THREE WAYS: are extremely good provide ...will "blend" device. You can do that with the Model ST -35 -KIT, with factory pre -aligned transform- true high fidelity performance ..." turn of a knob on most stereo amplifiers. ers, complete with gold and satin black cabinet. L J Net Price: $59.95 Model ST -35PA- SEMI -KIT, with tuner section factory- Reversed Cartridge wired and completetly pre- aligned for hairline sensi- JULIAN SIENKIEWICZ tivity, complete with gold and satin black cabinet. Hi -Fi Editor My favorite system of the three we tried Net Price: $69.95 POPULAR ELECTRONICS: for achieving three -speaker stereo sound is Model ST-35W - FACTORY -WIRED, aligned, calibrated the one that I plan to make permanent, and assembled, complete with gold and satin black . versatility outstanding ... because of its utter simplicity and -let nie cabinet. Net Price: $69.95 offers nearly all that could face it -the ingenuity of it. No reflection be asked for..:' on E -V at all, but this one is more my own r idea, for better or worse, and so I've taken a fancy to it even though it has some very CHARLES TEPFER dangerous mental pitfalls as you think it Hi -Fi Editor through. I may be in some of them still, ELECTRONICS ILLUSTRATED: for all I know. "...integrated ...neater ...listening This system has no transformers, no cir- cuit changes in the amplifier at all, re- tests revealed it to be a Good Buy..." quires nothing extra other than the two NEW PACO 2 -WAY SPEAKER SYSTEM SEMI -KIT L J leads to the third speaker. For convenience, featuring Jensen Mid -Range Woofer and Horn -Type I've added a switch in my pickup line in Tweeter Here you have read a sampling from just a few case I want to revert to conventional Model L2-U -SEMI -KIT. with unfinished, sanded cabinet. of the recent RAVE REPORTS on the PACO Net Price: $59.95 SA-40. stereo, you won't need even you Now we invite you to send for your personal but this if Model L2- F- SEMI -KIT, with walnut -finished cabinet. portfolio of the complete reports. Read them, stay faithful to this three-way arrange- Net Price: $69.95 and you'll agree -for the cri- tical audio enthusiast who All you have to do, for this system, is to AVAILABLE AT LEADING ELEC. wants quality at a moderate TRONIC PARTS DISTRIBUTORS & price -the PACO SA -40 is the hook your center speaker directly to two WHEREVER GOOD SOUND IS SOLD. one truly logical choice to corresponding taps at the two amplifier . make. WRITE: You'll want much more data .. outputs -mine was hooked to the two B- the performance specifications ELECTRONICS INC. Volume will amaze you...write for com- Elm m CO., ohm taps. control (an old rheo- plete, illustrated brochure stat, 50 -ohms, did very well for all these 70.31 84th Street, Glendale 27, L. I., New York ELECTRONICSS CO., INC. Kit Division of PRECISION Apparatus Company, Inc. systems) on the middle speaker goes with- a subsidiary of Pacotronies, Inc. out saying. 70-31 84th Street, Glendale 27, L. I., New York Kit Division of PRECISION Apparatus Company. Inc. AUDIO AUGUST, 1960 83 But how can that be? You'll be getting cal mono. Fine for Edison discs and verti- this is only part of the only the difference signal between the two cal -cut radio transcriptions.) stereo channels, and that isn't really quite Only one further item to note: accord- BOGEN -PRESTO what's needed, now, is it? You can't be ing to the battery analogy, this system that naive? It just won't work, old boy . gives you double the voltage at the center high fidelity Well, to tell the truth, I always get a bit speaker, as compared with the two side nervous when I describe these simple things. Can I have made a ghastly mistake picture... -am I utterly befuddled over something painfully elementary? Have I stuck my foot into my mouth? Maybe, but I haven't finished yet. Two 1.5 more minor changes -not additions -in the

total circuitry. First, reverse the phasing 6 v. of one outer speaker, and second, reverse the leads on one channel of your stereo cartridge -all as shown in Fig. 5. 1.5v. WHAT? Doesn't that give you vertical response only? Fine thing. But -whoa, don't jump to conclusions. (I almost did myself, there.) It does not, because you are not paralleling the two sides of the cartridge, reversed, which would indeed give you vertical -only response. Rather, you are still sending out two signals, to two amplifiers; you have merely reversed one 1.5v. set of leads before it reaches the ampli- fier input. 3 Now, if I am still on the straight and narrow track (I imagine I'm falling into 1.5 ...the rest is in the quality and per- another abyss at each stage in this argu- ment), the amplifiers don't really know formance of the components. For the difference, so to speak, when the car- literature describing Bogen-Presto tridge signals are reversed. Yes, I know there are ominously subdued rumblings to Fig. 6 tuners. amplifiers, turntables. and be heard concerning common grounds and accessories, write to Desk the like-but, as I plunge blindly onward I speakers. Feed three volts d.c. into the can state (faintly) that this doesn't seem to battery analogy circuit, Fig. 6, and you affect the case, or didn't when we tried it. get 3 on the outside meters, six on the OBOGEN- PRESTO Natch, I'm assuming a four -wire cartridge middle one. BOX 500. PARAMUS. N. J. and arm harness. Any three -wire system No problem in practice. It's only a 3 db will botch my idea for a fare -thee -well, difference anyhow, and your volume con- A DIVISION OF THE SIEGLER CORPORATION needless to say. trol on the center speaker-always neces- Four wires, all independent (a fifth may sary-takes it down to size. Iii fact I didn't Circle 84A be a protecting ground, as on some car- ' even notice the difference when we tried tridges), and one pair reversed. At the our various systems; I merely saw it, on other end of your amplifiers you come out paper. At most, it gives you a slightly more with stereo in your two speakers, but out mono effect with. the center speaker all the of phase; that's all. However, you've re- way up and an imperceptibly greater versed the phase on one speaker, so it's in range of control. phase after all. P.S. It's mostly irrelevant, but the sys- And as for the center speaker, it now tem we rigged in this fashion used a Shure gets not the difference but the sum signal M3D cartridge in a Dyna- Empire arm. The -which, if I am right, is what we're look- amplifier was, again, the Sherwood system send for ing for. as used with the E -V transformer. The Simple, you see -so simple that I keep outer speakers were a convenient pair of ALLIED'S thinking, there must be something wrong KLH Sixes that I had on hand, the center somewhere; it can't be this easy. speaker was practically the original AR2. BARGAIN Well, I got sound out of it, anyhow, and I note, by the way, that whereas outer SUPPLEMENT I liked it. My switch, next to the arm, con- stereo speakers, any pair, should always verts to standard when I want to use the be identical if this is humanly possible, arm for two- speaker stereo, and I have the center speaker can be somewhat dif- been careful to mark things up so that this ferent in sound, as in this case. Mostly a particular cartridge won't accidentally get matter of symmetry, I guess; your ears into an ordinary system with its leads still can "take" a difference in the middle better one SAVE MOST on quality Stereo hi -û! Bee reversed. Got to watch it, there. Other than than a lopsided difference between top buys in Allied -recommended com- that, I haven't done anything special and side and the other. plete systems, KNIGHTa quality Stereo don't intend to (But I can get all -vertical hi-fi units, and KNIGHT-KIT® build-your- response very neatly, now, as well as lat- 2. FROM MONO? own Stereo. You'll find hundreds of STEREO money -saving values in famous name eral -only, by using my other permanent one that parallels the pickup This last winter I had a considerable amplifiers, tuners, changers, speakers, switch, the running correspondence with none other cabinetry, accessories -as well as re- leads. In the normal position I get lateral the corders, P. A. systems, test instruments mono, in the reversed position I get verti- than Prof. Doktor Hermann Scherchen, and electronic supplies. Extra big sav- eminent conductor who is also editor of ings on stereo records and tapes! Send the technical journal Gravesano Blätter, on for your FREE Allied Supplement packed acoustics and related matters, and director with bargain buys and newest products! of the very famous laboratories for as- ALLIED RADIO sorted research in acoustics at Gravesano, Italian Switzerland. Many a reader will FREE remember Dr. S. for the drums in that SUPPLEMENT ALLIED RADIO, Dept. 73 -It Westminster Haydn "Military" Symphony, 100 N. Western Ave., Chicago 10, III. a hi -fi standby at the shows long before O Send FREE Allied Supplement No. 195 stereo came along ... but his remarks to me had to do with his own work in ap- Name proximating the impact of stereo via mono recording. His English was so delightful Address that for awhile I was not entirely clear as to where we were aiming, but in the end City rene Stote he went into German, which left me to t. Fig. 5 cope with my own not -so- delightful know- Circle 84B AUGUST, 1960 84 AUDIO vaporous and inde- ledge of that language. between, or seems oddly he sent me over a small gadget terminate, not easily located in any direc- Anyhow, move. of his designing, called the Stereophoner, tion yet, somehow, nervously on the licensed for manufacture in England, Granted that this poses interesting aes- numerous greats as a splendid thetic questions as to what in the long run hailed by are answer to the challenge of better sound is desirable- granted that these effects without recourse to stereo and doubled unusual and perhaps interesting in them- everything. Nothing quite like it, they all selves, and even just possibly useful to the said, and their combined opinion was im- musical sense in terms of a more dynamic pressive. character to each sound. Could be, and Well, the Stereophoner came, and I like would be -if we didn't already have stereo. stereo better. But, remember, I'm an Ameri- With mono alone on the scene, the Stereo - can, and American tastes in these matters phoner and other gadgets of similar design are very significantly different from those could be quite useful as listening enhancers. in Europe. The general idea is not new by any means, The Stereophoner was a small box, three of course. or four inches square and not at all heavy But we do have stereo -and stereo is so -clearly no transformers -which accepted very much better, so much truer to the a single speaker signal, two leads, and musical intention (when used rightly), so put forth two signals, four wires, labeled much more steady and reliable, so very Experts disagree right speaker and left speaker. There was much more accurate in its projection of a volume control, a rheostat, and by the whole sounds, that for my Engineers choose the new ESL -C99 feel of it a very simple one, a single ele- ear the Stereophoner and other such de- Micro /flex stereo cartridge because ment and no more. vices are obsolete, and poor substitutes at of its patented, inherently linear It was not proper for me to delve inside best. D'Arsonval movements and exclusive not, the the stereophoner and I did thing Micro /flex separating system. being well sealed up. But I did take it over (Readers may remember a similar idea to an engineer friend of mine and we set it proposed by Tenny Lode in the January, Musicians, on the other hand, prefer 1950, issue of AUDIO. Mr. Lode described up to see what happened. - the ESL simply because it makes and marketed, too, at that time pair of Clearly, minus transformers and inserted -a records sound better. in the low -impedance speaker line, this complementary networks which introduced gadget was not likely to be over -complex. a peak in the response of one loudspeaker Are you enjoying this superlative We tried each channel separately and found in the vicinity of 800 cps and a correspond - cartridge yet? It's only $49.50 ing dip in. the response of the other, with that the volume control affected only one at your dealer's. of the outputs. We played various signals the total output being "flat" for the two speakers. Thus the midrange was boosted through each half -no time delay (and un- FOR LISTENING AT ITS BEST likely, at that), no observable alterations on one speaker, while the highs and lows other than the very simplest, which you can predominated on the other-permitting the Electro -Sonic guess at yourself. To wit: one channel was use of a relatively narrow -range speaker Laboratories, Inc. attenuated in the lows, the other in the for the boosted -midrange output. There highs. That was all, as we figured it. was a stereo effect, but as Mr. Canby says, DePt A 38 -84 38th St Long Island City 8, NY The "volume control" on one channel it is not stereo. ED.) Circle 85A served to alter the relationship between these two. The American Way We tried a few pieces of music on the BUILD YOUR OWN Stereophoner and there was indeed a spread Now all the above, I think, reflects an of sound between the two speakers that American viewpoint and is deliberately set ('nevi'! Q,'aliti/ was distinctly more varied and less forth as such, in view of our many Euro- bunched -up in the center than the usual pean readers who may be following this ELECTRONIC ORGAN identical signals sent from a mono source argument. into two stereo loudspeakers. This was There are two aspects that make my clearly a technological improvement of a argument American. One, of course, is our SAVE 50% mono signal, in a relatively narrow sense. economic opulence, our urge to spend more as in two - and more and make our home neighbors The two speakers did not seem, - speaker mono, to be tied together with a do it too, in the conviction that this leads . -31111` f '' single common emitting source right in the to greater and greater prosperity for all. --' ?> We is new, 4 middle between them. sell stereo because it it brings -'L And yet there were lacks, and falsehoods. in cash, gives new sorts of satisfaction to Lacks as compared with real stereo, false- an audience that can afford it, more or less. hoods in respect to musical integrity. I felt, We have remarkably few inhibitions when most of all, the lack of stereo's finest value it comes to launching new products and - for me, the dynamic, a live stereo- reverbera- we do it precipitately, piling on the bad .é ' tion or wall- bounce that does so much to with the good! With us, it's all or nothing; place stereo music in a living sense of no cautious innovations hereabouts. space. This simple dividing network circuit In Europe, stereo is a more difficult eco- / / could do little to approximate that -noth- nomic proposition for most people, and its introduction is both cautious and careful. `\ ing, would be a safer term. It did not pro- Step by step nstructions on No all -out, slam -bang promotion over there vide any sense of highs alternately both as you build aides, reverberating, and it could not, by -it would not be worth it. Mono still neces- Pay its nature. sarily rules, just as for a long time the Over 14 motels Moreover, with the higher tones sent 78 -rpm disc held on in Europe after our THE predominantly to one side and the lower precipitate conversion to LP. ELECTRONIC tones to the other, a familiar effect was It is therefore of much greater interest ORGAN apparent-the disembodiment of instru- to a European record collector, than to mental sound. In such a situation, many one of our people, to hear that a device is Seul 'or free Iltefa:ure instruments are bisected, the fundamental available that can create a sense of im- tones being sent to one side and the color- proved realism without the necessity for a ing overtones to the other. Thus you may dual stereo system throughout. To many a ELECTRONIC ORGAN ARTS hear the fundamental pitch of a clarinet European collector, this sort of gadgetry is ).. LOS ANGELES IP, CUF to the right, but the characteristic tone helpful and common -sense, avoiding the Please Send UR' free in foramhuu color to the left, remotely. spendthrift luxury of the stereo system. Considering some of the unfortunate stereo Actually, the ears don't take the sound NAME. in that fashion -at least, not consciously. discs we've perpetrated for sensation, over Since every musical instrument changes its here, and considering our outrageously bad ADDRESS spectrum from tone to tone and often vio- mass-production stereo equipment and our CITY. ZONE lently in mid -tone, the audible effect most outrageously over -exaggerated stereo pub- obvious in the listening is a sort of erratic licity, we can commend the European for STATE flutter, or jumping. The sound is first on his common-sense caution and conserva- A -8 one side, then the other, or flutters rapidly tism. Circle 85B

AUDIO AUGUST, 1960 85 On the other hand, I can promote an op- posite argument to equal effect. We may be zany, over here, given to wild claims, CLASSIFIED headstrong and undisciplined advances, helter -skelter commercialism. We Ratu: 10* per word per Insertion for noncommercial 72/Mijrn/j. certainly advertisements; 25a per word for commercial adnr- are; but I can't help thinking that in the tluments. Rates are net, and no diuounts will be long pull, we Americans often come out allowed. COPY most be accompanied by remittance In fall, and mut reach the New York once by the with the best, and quietly get rid of the first of the month worst after it has had its fling. preceding the date of Issue. The noise of innovation, in all its crudity, is what the world hears from us. The subse- HIGH FIDELITY SPEAKERS REPAIRED quent slow boiling -down, the winnowing of AMPRITE SPEAKER SERVICE STABLE PERFORMANCE the chaff, tends to be lost in the general 168 W. 23rd St., New York 11, N. Y. enthusiasm it goes on, CH 3 -4812 AND UNIFORM -but just the same. QUALITY Give us time, and we end up with good Primo Dynamic Microphone is judgment. ENJOY PLEASANT SURPRISES? Then write now being used by 70% of general I think, thus, that we have a wider, more us before you purchase any hi-fl. You'll be glad you did. Unusual savings. Key Electron- taperecorder manufacturers in imaginative, less traditional, more open- minded viewpoint ics, 120 Liberty St., New York G, N. Y. EVer- Japan and gaining a high reput- towards innovations in green 4-6071. musical sound than is common in Europe ation. We promote the wildest, crudest, most WRITE for confidential money -saving prices exaggerated forms of sound, but we also on your HI- Fidelity amplifiers, tuners, speak- experiment in a wide- swinging manner, we ers, tape recorders. High Performance Individual quotations learn as listeners to like new sounds that only ; no catalogs. Classified HI.Fi Exchange, Impedance Switch System to were never heard before and to understand AR, 2375 East 65th St., Brooklyn 34, N. Y. be used as Noise Survey Meter. their new possibilities, even in the rein- terpreting of the old in music ; whereas SALE : 78 rpm recordings. 1900 -1950. Free Europeans- speaking lists. Collections bought. P. O. Box 155 (AU), very generally- Verona, N. J. tend to be more absorbed in relatively con- servative sounds, solid, impeccable, beauti- fully tailored, yet not so advanced, often. Low quotes on everything. HI Fl and Stereo tapes. Bargain list. HIFI, Roslyn 4, I have noticed this again and again in Po. European stereo versus American. Ours is flamboyant, often crude Components, recorders, free wholesale cata- and frequently logue. Carston, 125 -N East 88th Street, New downright awful. But we are right in the York 28, N. Y. thick of intense development of the stereo Model DM -172 medium, with liberal and splendid new Ampex, Concertone, Crown, Magnecord, No- sounds emerging that, for all their new- releo, Presto. Bogen. Tandberg, Sherwood, ness are already proving immensely valu- Rek- O -Kut, Scott, Shore, Dynnklt, others. able in termé of musical projection. Trades. Boynton Studio, Dept. AM, 10 Penn- In Europe, the average of stereo quality sylvania Ave., Tuckahoe, N. Y. is high, but the sound tends towards the conservative; the stereo FOR SALE : Presto 6N Turntable. First $75 tool is used care- takes. N. Y. C. pickup only. AXtel 7-3589. fully and precisely, to the point where for SPECIFICATIONS our ears some European stereo might as VIKING professional deck Frequency response: 50.10,000 well be mono, tape model 95, c/s ±3 dB so discreet is its impact. brand new, with 4 track playback head $400. Sensitivity: -73 dB(600 ohm at 1,000 c/s) Within a conservative limitation, much Long, Box 3202, Lafayette, Louisiana. Impedance: 600 ohm or 50 K ohm convertible European stereo is superbly beautiful. It Dimensions: 45(dia) X 115 m/m is seldom radical. Directional Marantz Stereo Preamp Mod. 7, original car- Characteristics; Non Directional Generalities, obviously, and I'm off my ton, sacrifice $200, Long, Box 3202, Lafayette, point, but not altogether. To return to the Louisiana. Stereophoner, my second point -the first being the matter of economics -is simply E -V ARISTOCRAT III Speaker $140 or best that we in America have moved generally offer. Bogen DB-20 amplifier plus gold cover $45. Charles Leigh, 10 S. Lanning, Hopewell, beyond such devices as this in our expecta- N. J. tions for reproduced sound. We have heard what we feel to be a more useful, more Model: Ampex 400A professional tape recorder, $400. DM 173 dramatic, more precise array of musical V. R. Hein, 418 Gregory, Rockford, Illinois. sounds in true stereo itself ; we are disap SUPER SMALL SIZE TYPE DYNAMIC pointed MICRO- by any compromise, and especially HEWLETT- PACKARD audio oscillator, 20- PHONE FOR TRANSISTOR TAPE RECORDER by any synthetic sense of spatial location. 20,000 E. Johnson, Montgomery Rond, Mid- *Most suitable for office use recorder. Heaven knows, our stereo might well dletown, N. Y. 'DM :173.T type with telephone coil can be coed by the switches. seem to be as synthetic as you can get! SPECIFICATIONS But, oddly, it has a real, progressive, con- Privately owned and treated with loving care. Frequency responre: 1504,000 c/s 33 dB structive syntheticism, out of which musi- Must sell Ampex Mod. 122 Stereo ($250). Sensitivity: -60 dB (10 k Ampex Mod. 960. 4 track Stereo (8 ohm at 1.000 c /s) cal art is being made in new forms. The ($500), Impedance: 1 k ohm 10 months old) Garrard Turntable Mod. or k ohm two -channels- out -of -one 301 Dimensions: 56m/m(height)i 40m /m(width)x synthetic effect is with G. E. arm and cartridge ($45). Fisher 20m/m(thickneas) by comparison unconstructive, dead, lim- 80 -C Preamp and Fisher 80 -A2 Amp ($65). Directional Characteristics: ited, unprovocative, like so much synthetic Donald Moloney, 2633 Milwaukee, Chicago, Non Directinal. orange- juice. Illinois. Well . perhaps I speak for a small minority hereabouts-who knows. But I'll RENT STEREO TAPES -over 1.500 different you - all major labels - free catalog Stereo - Model : DM4 bet can't sell the Stereophoner and its Parti 811 -H Centinela Ave., Inglewood 3, electrical cousins over, no matter how hard California. DYNAMIC MICROPHONE UNIT DM -A you try. Among the every kind of dynamic microphone units Not to me, anyhow. I've gone back to we are selling the DMA is one of the most popular. my This really stereo discs and tapes. excellent microphone unit is now being should installed into the microphone cases of the majority I add, here, that there are inter- of IF YOU ARE MOVING tape recorder manufacturen in Japan. resulting esting variants possible on the idea of a Fcomplete and perfect tape recorder microphone. dual -channel doctored output derived from Please notify our Circulation Department requency response: 70.10.000 c/s 13 daavailable at least 5 weeks in advance. The Post Office Unit Impedance: a single signal, among which is one once 10 ohm used does not forward magazines sent to wrong by my friend Jan Syrjala, for two - destinations unless you pay additional post- speaker ballet music on a round -the -world age, and we can NOT duplicate copies sent dance tour. (The entire orchestral reper- to you once. To save yourself, us, and the toire was taped ahead of Post Office a headache, won't you please PRIMO COMPANY, LTD. time and went cooperate? When notifying us, please give along for the dancing, via a pair of Ampex your old address and your new address. 350's and supporting equipment.) Jan's Circulation Department 2043 MURE, MITAKA -SHI, TOKYO, JAPAN trick, which I trust is no secret, seems to RADIO MAGAZINES, INC. me very sensible. Instead of a pair of chan- P. 0. Box 629, Mineola, N. Y, nels with high roll -off in one and low roll-

86 AUDIO AUGUST, 1960 ell in the other, as in the Stereophoner, Fastest, Easiest Way To Learn All About Audio hump and a valley. Jan's channels were a In the United States, NEW Rider "Picture- Book" Course That is, from his single mono signal he de- rived a pair of channels one of which was Gotham Audio Corporation normal at both low and high end but -and only Gotham -distributes BASIC AUDIO sagged in the middle ; the other was normal the Neumann line... sound was rolled off at by Norman H. Crowhurst in the middle range but standard of the world! The Rider "picture- book" approach has made both high and low ends. Complementary many technical subjects understandable to many curves, concave and convex. (Obviously hundreds of thousands of people. Now. everything ED.) (Maybe that's about sound and audio reproduction is made like Tenny Lode's. crystal- clear. If hi-ft is your interest -or if you where he got it. E. T. C.) work with tape recorders -or the broad subject The effect, he says, is most realistic, and of sound reproduction interests you, -or if you Some instru- assemble your hi-fi equipment or buy a complete useful for ballet in action. "package"- you must read BASIC AUDIO. ments, notably the big drums, produce If you already own sound reproducing equipment largely the extremes of tonal range - -this "picture- book" course will give you an all- strong lows plus short, high -range over- around background on all the important details of instruments sound out clear sound reproduction. It will enable you to get the tones; these most from your equipment. and complete through one side channel, the You can learn easily, rapidly at very low cost. one with the concave curve, high and low You build your knowledge step -by-step. There's ends normal. But other instruments are one idea and one specially prepared illustration opposite. Violins, for instance, per page. More than 400 illustrations for maxi- just the mum understanding. are lacking in lows and are very strong in Beyond a knowledge of electricity at the basie mid -range highs. Their predominantly mid- level, no previous electronic experience is needed range sound is neatly picked out by the op- to get the maximum from this course. Whatever and sounds clearly on the electronics circuit theory is required to make the posite speaker entire panorama of sound reproduction and re- other side of the listening expanse from cording visible to you is provided. the drums. This Rider "picture- book" audio course is corn. I'd suggest that if the people at Grave - pletely different from anything that has ever been they presented. We guarantee satisfaction. sano want to develop Stereophoner II, your might approach Mssrs. Lode and Syrjala. #201,3 vols., soft covers $8.70;#201 -H. cloth$9.95 now, it At your jobber or book store, or order direct AU -8. But they're so busy making stereo probably wouldn't work out. John F. Rider Pub., Inc., 116 W. 14th St., N.Y.C. In Canada. Charles W. Painters, Lid., 66 Rahn. Road. Randal., Der Circle 87C PACKAGE HI FI or SINGLE COMPONENTS You'll lind our prices low I and service last. GOTHAM AUDIO CORPORATION Fm/Q, Write for our quotation 2 W. 46 St., N.Y. 36, N.Y. Tel: CO 5.4111 CENTER ELECTRONICS Co., Inc. Formerly Gotham Audio Sales Co. Inc. ANTENNAE 74 -A Cortlandt St. New York 7, N. Y. THE FINEST OF ITS KIND . , Get more FM stations with the world's most Circle 87G Circle 87A powerful FM Yogi Antenna systems.

To be fully informed, BEST IN HI -FI VALUES! send 250 for book "Theme And Varia NO All orders rushed to you fions" by L. F B. Carini DELAY in factory -sealed cartons. and containing FM SERVICE Write for free catalog. Station Directory. 25.A Oxford Road APPARATUS DEVELOPMENT CO. audl T1 Massapequa, New York E T H E R S F I E L D 9, C O N N W Circle 87H Circle 87D A NOTE TO THE HI -FI BUYER CANADA AIR MAIL us your requirements for High Fidelity Equipment an IMMEDIATE WHOLESALE QUOTATION Lines Complete Serviti Components, Topes and Recorders Complete SHIPPED PROMPTLY AT LOWEST PRICES HI -FI Records Components end Accessories- WRITE TODAY FOR FREE CATALOG audio 714 -A Lexington Ave. E,LECTROi)O10E unlimited New York 22, N. Y. SOUND SYSTEMS Circle 87K 126 RUNDAS ST. WEST. TORONTO, CANADA LOOKING FOR a Circle 87E pleasant surprise? Write for our new hi -8 ,r1 tr.s. catalog. You'll be glad you did. ELECTROSTATIC TWEETER KEY Electronics THRILLING 120 Liberty St., New York 6, N. Y. HI FREQUENCY CL 8 -4288 . RESPONSE ONLY $19.95 Circle 87M ORDER BY MAIL s R E N T MANUFACTURER 1015 stereo tapes FUKUYO SOUND S. FIGUEROA OVER 1500 DIFFERENT ALBUMS kieruiff LOS ANGELES POSTPAID TO AND FROM YOUR NOME e2 -25, Hori,une, Kilo -ku, Tokyo SOUND CORPORATION CALIFORNIA SEND FOR -parti Cable: CORALFUKUYO fREE BROCHURE stereo 811 -C CENTINELA AVE. Circle 878 Circle 87F Circle 87N

AUDIO AUGUST, 1960 87 BUYER'S GUIDE AUDIOMAN (from page 77) NO 11 is a new, low -cost magnetic stereo cartridge especially designed for use with record chang- Young college professor finds time for music, hi -fi, organ ers. The Professional (M3D) and Custom (MID) are designed for mounting in tran- building, swimming, sailing, and to become latest Audioman. scription tone arms and record changers re- spectively. The Standard has a frequency response of 30 to 15,000 cps and the Profes- sional and Custom have a response of 20 10 15,000 cps. All have outputs of 5 mi- per chan- WBEN HE CAN find the time outside nel, and channel separations of more than 20 db at 1000 cps. Recommended load impedance his activities at Wagner College is 47,000 ohms. The Professional has an in- where he is an Assistant Professor ductance of 365 mh, a d.c. resistance of 33 ohms and a compliance of 4 x 10-0 cm /dyne. of Chemistry, Dr. James S. Swinehart puts The Custom and Standard have an inductance together kits of various kinds, records and of 400 nth and a d.c. resistance of 400 ohms. listens to music, and swims and sails Compliance of the Custom is 3.5 x 10-s cm/ when dyne and of the Standard Is 3.0 x 10-s cm/ the weather permits. And being unmarried, dyne. All have four terminals and flt standard he doesn't have mounting .dimensions. Shure Brothers, Inc., to get his equipment in 222 Hartrey Ave., Evanston, Illinois. User decorator -approved cabinets before the net prices: M3D. $45.00 ; M7D, $24.00 ; 1118D, $10.50. quality of the equipment meets his de- mands. When he was selected as an Audio - SONOTONE man, his cabinet work was not completed. It isn't yet, but he is working on it. Series "12" Crystal Stereo Cartridges. De- signed for high output at low cost, the new But that doesn't mean that he does not Sonotone crystal stereo cartridges models have good equipment -even in his 1960 "12TH" and "12TL" are male entirely of Rambler plastic except for the styli. crystal elements he has a Becker FM radio with a and mounting brackets. This construction 7 -watt amplifier and an AR -2 so his traveling listening should not be apprecia- bly less in quality than his fixed listening. For equipment, Dr. Swinehart uses a Fisher FM -90X tuner, two Dynakit pre - amps with a Dynakit stereo adapter, and two Dynakit power amplifiers, Marks II and III. His turntable is Components Cor- poration, and he uses ESL and Grado arms with a Grado pickup for 78's and a Grado Custom and a Shure M3D for mono and stereo LP's. He listens through three AR -3's, the third one to become a center speaker when he gets a living room large Like most Audionieu, Dr. Swinehart is enough to need one. He has an Ampex 350 continually being called upon by with friends extra electronics for stereo, and he to help in the planning and installation of uses two Sony microphones. their systems, and he estimates that his makes them suitable for mass production. The cabinet shown below is fitted with which in turn effects price reduction. Supplied advise is asked at least twice a week, and with standard 0.7 mil and 3 mil turnover movable shelves so he has been able to Ile has helped in the installation and design sapphire styli. both cartridges come complete make any necessary accommodation for the of more than thirty systems. with mounting bracket and terminal plug. The "12TH" cartridge has an output of 2.5 various units of equipment (when the pic- Activities around his college keep him volts and the "12TL" has an output of 1.0 ture was taken, he volts. still had a Fairchild from taking part in community activities, Stylus replacement is facilitated be- amplifier one cause the turnover lever need merely be for channel). But this ar- but Dr. Swinehart does find time to at- snapped out and replaced by another turnover rangement is acceptable to the serious tend plays, operas, and concerts -at least lever /stylus assembly, which can then be audio -fan because snapped back in. Sonotone Corporation. Elms- it permits him to keep one of them each week. And just to keep ford, New York. User net price. $6.45 for the system up to date without having to in practice with his either cartridge. listening, he has an- spend all of his time in modifying the other AR -this time a 2 -in his bedroom. STEREOTWIN cabinet. However, his new cabinetry is Seems as though we might just like to go nearly complete, and then everything will back to school again if one can find enough Moving Magnet Stereo Cartridge. Model be all set-for how long? leisure for all these activities. 210D is completely hum free and features a mounting clip which provides optimum posi- tion in either transcription arms or changers. Stylus assembly may be changed instantly

Flexible enough to permit easy serv- icing and the usual audioman's proclivities for changing equip- ment. without tools. Output is approximately 12 my for a 5 cm /sec stylus velocity, with separa- tion of more than 22 db at 1000 cps, over 10 db at 10,000 cps. Vertical and lateral com- pliance. 5.5 x 10 cm /dyne, and tracking force approximately 5 grants in changers. 3 to 4 grants in transcription arms. Audiogersh Cor- poration. 514 Broadway, New York 12, N. T. User net Price, $34.50.

88 AUDIO AUGUST, 1960 quency response is 30 to 17.000 cps within WEATHERS AMPEX 2 db, flutter and wow is 0.09 %' at 3% ips FM Pickup System. frequency response is 30 to 9000 cps within Utilizing a different Portable Stereo Tapc Recorder. The Ampex 2 db, flutter anti wow is 0.15 %. Timing ac- design principle than virtually all other pick- model 970 is a new model of their portable is ups, the Weathers MM -1 is a nongenerator stereo tape recorder featuring a self-contained curacy 99.5%. Crown International, South which achieves extremely low stylus tracking matched pair of amplifier /speakers for stereo 17th St. and Mishawaba Road, Elkhart, In- force. This low tracking force is achieved be- playback monitoring. The new unit utilizes diana. User net price, $715.00. cause the motion of the stylus is not used to the sanie tape transport as the Ampex model 712. 2 -track stereo tee $695.00 generate a voltage and thus an extremely 960 portable deck, installed in a longer port- 752, stereo player 337.00 compliant armature is possible. In addition, able case with a two- channel stereo amplifier because the cartridge is an electrostatic de- and two 7" oval speakers which face outward from each end of the unit. Sound -directing panels are in front of each speaker thus per- FERROGRAPH mitting sonne directional control of the sound. Monitoring "off- the -tape" while recording can Professional Stereo Tape Recorder Series. be done either through earphones or the unit's The Ferrograph SOS series offers complete own speakers because the 970 has separate stereo recording and playback facilities as record and playback preamps as well as sepa- well as monophonic recording and playback. rate heads for record. playback, and erase. Both the standard half -track (model 808/2) C npnble of recording and playing two -track and quarter-track (model 808/4) stereo ma- chines are available with 3% and 7% fps tape speeds. Portable units, the 808 series have matched outputs at low -level to feed a high fidelity system. Both models accommo- date reels up to 8%" and have a flat fre- quency response (± 2 db) of 40 to 15,000 cps at 15 fps ; 50 to 10,000 cps at 7% ips and 50 to 8000 cps at 3% ips. Signal -to -noise ratio is better than 50 db, 200 to 12.000 cps; 45 db uuweighted including hum. Three motors are used including one hysteresis-synchronous vice, It is not susceptible to hum pickup from IF "At turntable motor fields. Frequency response of to the system is ± 1 db 20 to 20,000 cps. Stylus tracking force is 1 to 1% grams; lateral compliance is 16.4 x 10-0 cm /dyne and verti- stereo and '/i -track monophonically, it ern cal compliance is 8.2 x 10-0 em /dyne. It must also play four -track tape. It can also be used be operated in conjunction with the "Micro as a -in s-ereo or mono. Touch" arm and P -151 Polarizing Supply. Capable of essentially distortionless frequency Weathers Industries, 66 East Gloucester Pike, response from 30 to 20,000 cps at 7% ips. and Barrington, N..1. User net price, $92.10. :i0 to 15,000 cps at 3% ips. Its precision engineered timing accuracy is such that it offers perfection of pitch held to tolerances of % of a half -tone. Flutter and wow less than 0.2% rms at 7% ips; under 0.25% nt :i% ips. High -impedance inputs are provided for microphone and high -level program sources. Azimuth alignment of stereo head TAPE RECORDERS gaps is within 20 seconds of an arc, equivalent to less than 10 millionths of an inch. The ap- drive motor for the capstan. Other features AMERICAN CONCERTONE pearance of the 970, in n distinctive gray include recording VU meter, auto -switch cut- carrying case is in keeping with its impressive off, "Ferrodexer" gear driven turn counter, Stereo Tape Recorder. Professional quality performance. Ampex Audio, Inc., 1020 'lifer and azimuth adjustment for heads. Distrib- sound in a moderately priced instrument Road, Sunnyvale, Calif. User net price, uted in United States by Ercona Corporation, makes the Concertone 505 an ideal investment $;,9:5.00. 16 West 40th St., N. Y. User net price, either for the advanced non -professional. The 505 960, stereo recorder $ 495.00 model $595.00. records and plays hack 2 -track stereo and 952, tape deck, uncased 449.50 monophonic tapes and in addition can play 354, prof stereo /mono rec 1775.00 HEATHKIT back 4 -track stereo and monophonic tapes. 2010, amp -spkr, matches 960 199.50 ea. Featured in the 505 is a direct -drive capstan Stereo -Mono l'ape Recorder Kits. The Heath motor and capacitor type induction reeling TR -lA serles consists of three models; the motors. Manufacturing tolerances are stated two -track TR -1AH, the four -track TR -1AQ, CROWN and the two -track TR -1A. The TR -lA records and plays back monophonic tapes only ; both Professional Sirrro Tape Recorder. A ma- other models record and playback either stereo chine of advanced design, the Crown 714C or monophonic tapes. The tape deck mecha- (Stereo X) records and plays back four -track nism is extremely simple to assemble. Preci- stereo, plays two -track stereo, and records sion hearings and close machining tolerances and plays 4 -track monophonic tapes. Fea- hold flutter and wow to less than 0.35 %. tured in the 714C are three speed operation Power is provided by a four -pole, fan-cooled (15, 7% and 3% fps), forced air cooling, induction motor. One lever controls all tape patented differential magnetic braking to as- handling functions of forward. fast -forward sure smooth operation without tape stretch, or rewind modes of operation. The deck handles up to 7" tape reels at 7% or 3% ips as determined by belt position. The TR -1A series decks may he mounted in either a verti- cal or horizontal position (mounting brackets included). The TE -1 Tape Electronics kit features NAItTB equalization. separate record

+ 4;1. CZ:3 `410

to be within two millionths on some parts. Push -button controls are solenoid operated. Automatic reel -end cutoff switch prevents tape runaway. Self -energizing brakes assure smooth operation without tape stretch. Dual inputs are supplied for microphones and auxiliary devices. Four separate level con- trols permit mixing of all inputs. Frequency response is 50 to 15,000 cps + 2 db at 7% ips. and playback gain controls. cathode follower Lightweight for easy portability. the 505 automatic stop to prevent tape runaway, and outputs and provision for mike or line inputs. weighs only 36 lbs. including recording and non- magnetic capstan. The all -aluminum Recording level is indicated on a "magic eye" playback preamplifiers. American Concertone panels are satin anodized and markings are tube. A safety interlock minimizes the possi- division of American Electronics, Inc., 9449 deep engraved for performance. Four high- bility of accidental erasure by locking in W. Jefferson Blvd.. Culver City, Calif. User impedance microphone inputs are provided; "play" position. Bias -erase current is pro- net price, $495.00 (less carrying case). four level controls permit mixing of all in- vided by a push -pull oscillator for low noise puts. Cathode follower outputs plus standard and distortion and a heater balance control TR -100, portable transistorized rec . $199.95 rack mount permit adaptability to a large allows adjustment to minimum hum level. 33, professional stereo rec 995.00 variety of equipment. At 15 ips frequency re- Cathode follower output is at 600 ohms im- Series 90, line of professional rec 845.00 up sponse is 50 to 28,000 cps plus or minus 2 pedance. Two circuit boards are used for easy Series 500, line of stereo rec 379.00 up db, flutter and wow is 0.06%; at 7% ips fre- assembly and high circuit stability. Heath

AUDIO AUGUST, 1960 89 Company, Benton Harbor. Michigan. User net 101/2" reels, as well as NAB hubs. Two price; TR -1A $99.95, TR -IAH and TR -1AQ MOVIC speeds, 7if- and 3% fps, are provided, and $149.95. flutter is less than 0.2% at the higher speed, Two -Speed Stereo Tape Recorder. Manu- less than 0.25% at the lower. Response is TR -I Series, tape decks $159.95- 169.95 factured in Denmark, the Movie model A -2 is from 30 to 15,000 cps +2 db at 7% fps. and TE -1, tape rec elec kit 39.95 a skillful blend of old world craftsmanship 40 to 10,000 3:P, ips. Equalization is and new world design. Features in this preci- cps at sion machine include; sound -on -sound record- ing capability, two built -in output amplifiers, LAFAYETTE echo -chamber effect if desired, hysteresis -syn- Two -Speed Tape Recorder. Though small chronous capstan motor, separate amplifiers in size, the Lafayette RK-400 Is a full -func- for the two built -in VU meters, two custom tion tape recorder providing all the features designed reel motors to provide unusually and performance normally associated with gentle tape handling, cue switch for easy larger tape units. Convenient operation pro- editing. either channel can be monitored /P vided by the single function control plus an through the Internal speaker. The two play- back amplifiers have cascaded input stages with d.c. on the heaters for low noise. NAB equalization is provided in the feedback net- r?t5 work for both 7% and 3% ips speeds. Both , amplifiers have adjustable treble equalization 4.,., .

©®®o,®(1)o w : in accordance with NAB standards, and out - put is approximately 1.3 volts from cathode followers. Two input jacks are provided for each channel, one for microphone and one for high -level sources. Newcomb Audio Prod- ucts Co.. 6824 Lexington Ave.. Hollywood 38, Calif. User net prices: SM- 310 -4, $499.50; SM -310, $499.50.

NORELCO Stereo Tape Recorder. Engineered and man- on /off volume control. A simple capstan ad- ufactured by Philips of The Netherlands. the justment speed from 3%4 changes 7% to ips. new Continental "400" features half -track Frequency range is 60 to 8500 cps at 7% ips. stereo playback and quarter -track stereo and Record level indicated by light. Complete with monophonic record and playback for tape crystal microphone. Finished in scuff resist- economy, three speeds -7%, 3% and 1% ips ant pyroxylin material. Lafayette Electronics versa and simple piano -key con- Mfg., Corp., 104 -46 Dunkirk St., Jamaica 12, -for iiity, N. T. User net price. $54.50. and a cathode follower output to both jacks. The two record amplifiers have NAB equaliza- tion in the feedback networks for both 7% MAGNECORD and 3% ips tape speeds. A specially designed push -pull erase /bias oscillator circuit (Patent Stereo Magnecordetle. The Series 100 Mag- Pending) gives an clean wave necordette is a portable professional -type unusually form. tape recorder which both records and Wow and flutter are less than 0.1%5 rms and plays signal -to -noise ratio is 50 db or better at 75,5 back in -line stereo. A two -speed machine. ips. Frequency response at 7% ips is 45 to operating at 7% and 3% ips, it is also cap- 14.000 cps +2 db. Movie Company, Inc., able of standard monophonic recording and 12432 Santa Monica Blvd., Los Angeles 25, playback when desired. Separate VU meters User net price, $645.00. and gain controls are incorporated for each Calif. channel, as well as a master gain control A -2 -15, prof 7t/2/15 ips rec $710.00 which operates on both channels simultane- ously. Frequency response is 40 to 15.000 cps +2.0 db at 7% fps; 50 to 7500 ±2 db at 3 NACRA ips. Inputs are provided for two high -im- pedance microphones, also for auxiliary de- Portable, Profceeional, Tape Recorder. The Nagra IIIB is a completely transistorized professional, 3 -speed (3 %, 7%, 15 ips) tape recorder. Incorporating three heads and a servo -controlled motor. the Nagra IIIB has a speed constancy of 0.2 %. Wow and flutter is 0.15% at 15 ips and 0.2% at 7% ips. Sig- nal -to -noise ratio is 58 db or better. The re- trols for ease of operation. It is fully com- corder operates from any 12 -volt source or patible with conventional recorded tapes. The from the self -contained flashlight batteries : unit comprises a tape-drive mechanism, two battery condition and level being indicated preamplifiers with controls, two 4 -watt power amplifiers, and a Norelco wide -range speaker, all housed in a high- fashion portable carry- ing case. Also furnished is a Norelco dynamic stereo (dual element) microphone. A second speaker is supplied for stereo playback. Dub- bing facilities permit recording sound on sound. The Continental 400 has inputs for recording from microphone, tubers, and s phonograph, with facilities for mixing the microphone input with either of the other two. An output jack for monitoring with stereo headphones is also provided. Special Philips magnetic heads with a gap of only 0.00015 in. make possible extended high -frequency re- sponse even at lower recording speeds. Fre- quency ranges at the various speeds are : 7% by the built -in meter. Output is + VU nt ips-.0 to 18,000 cps; 3% ips -60 to 14,000 600 ohms balanced. A monitor-speaker is built cps ; 1% ips-60 to 7000 cps. Noise level is in and an AGC circuit controls speech level down 55 db. and flutter and wow are less during recording. All normal microphone in- than 0.3 per cent. High Fidelity Products puts are incorporated in addition to two line Division, North American Philips Company. vices such as tuners, phono cartridges, etc. mixers. Electronic Applications, Inc., 194 Inc., Hicksville, N. Y. User net price, $399.50. Two -motor drive system holds flutter and wow Richmond Hill Ave., Stamford, Conn. User to less than 0.3 per cent. Noise level is down net price, $1,04.5.00. more than 48 db. Binaural monitoring is ROBERTS accomplished by means of n panel- mounted NEWCOMB phone jack. Playback outputs are cathode Multiple Track 7'apc Recorder. Providing followers which 1.0 volt from normal recording facilities in one basic unit, a fine instrument Stereo Tape Recorders. Now available in multiple output level. This is truly the i4 -track version as Model SM -310 -4 as the Roberts "Duet" Model 90 -D provides both for the serious hobbyist who demands a high well as % -track and professional a simple method measure audio as well ns dependa- the earlier Model SM -310, amateur of quality the Newcomb stereo tape recorder is "cyber- for multiple recording, sound -on-sound, sound - bility of performance. Magnecord Division. netically engineered for intuitive operation." with-sound. After recording the basic or Midwestern Instruments, Inc.. 41st St. and second simultaneous re- Road, User net Control of the tape transport is centered in "master" track, the Sheridan Tulsa. Okla. price, a "joy stick" which is sensibly moved to the cording may be made while monitoring the in portable carrying case, $449.95. left to rewind, to the right for fast forward, basic recording either through earphones or 728 -4X, prof stereo rec, less case... $ 759.00 and toward the operator for record and play an external amplifier- speaker system. A simple M90 -BAC, prof rec w /amps, cases .. 2255.00 modes. Both models will operate either verti- switching arrangement enables playback of P75 -AC, prof rec /amps in case .... 880.00 cally or horizontally and take from 3" to both tracks simultaneously or individual play-

90 AUDIO AUGUST, 1960 reliable performance. Other features include a three heads- monophonic erase and play/ battery life indicator, 3% and I% ips tape record heads, and a 4 -track stereo head which speeds, usable as a portable PA system, sepa- may he used as a monitor during monophonic rate motors for fast wind and capstan drive. recording, or for playing back both 2- and and can be played through an external ampli- 4 -track stereo tapes : 900 -3 has two heads, fier. Easy to load and operate, the Magnetic stereo erase and 4 -track record /play ; 900 -4 is equipped only for playback, and has a single 4 -track head which will play mono and stereo topes; 900 -5 has three stereo heads, making it possible to monitor a tape during recording. All models are for 3 -speed operation -7yc.. 3% and I% ips. Flutter and wow content is less than 0.25 per cent. Signal -to-noise ratio is better than 45 db when used with the TRP -21. Speed accuracy is within NARTB standards. The mechanism etnplovs a single motor with belt drive to the reel hubs and to the capstan. the latter having n large fly-

provides push -button controls, a 3 -digit counter, VC level and Magic -eye modulation back of either track. Erasure of the second indicators. Frequency range is 50 to 9000 cps track can be accomplished without erasing nt 3% fps ; 60 to 4000 cps at I% fps. Dis- the basic track. These tentures are especially tributed in United States by Ercona Corp., valuable to musicians and vocalists in that 16 Rest 46th St., N. Y. User net price, they can record accompaniment and back- $269.50. ground music on the basic channel and record and re- record their own vocal or instrumental until they achieve the effect they desire. TANDBERG Ipartsn addition to its dual recording feature, the "Duet" performs nll functions of a half -track Stereo 7'ape Deck. Feature for feature the monaural and 2 -track stereophonic record Tnndberg Series 6 Tape Deck represents mag- play unit. Specifications are identical to those nificent performance in a compact, handsomely of the Roberts 90 -C recorder /reproducer. styled ,ckage.pa A three -speed machine (7%. Roberts Electronics Inc., 829 North Highland 3%,3 % 1% ips) it records 4 -track both mono- wheel for speed stability. Transport controls Avenue, Los Angeles 38. Calif. User net price phonically and stereophonically, and plays are push -button operated. They include: stop, including headphones and microphone, back 4-track. The unique 4 -track stacked pre- rewind. wind, play. and pause. The TRP -21 $349.50. cision laminar record head las double mu- frequency response is 50 to 15,000 cps ±2.0 db. metal shielding to give crosstalk rejection of Inputs are supplied for a low -level microphone 990, 4 -track ster rec $450.00 60 db. Built -in are four separate preampli- and high -level tuner, with maximum recording level sensitivity of 0.002 volt. Telectrosonic Corporation, 35-18 37th St., Long Island SUPERSCOPE/SONY City. N. Y. User net price : Model 900 -1 tape transport. $89.95: 900 -2, $104.00; 900 -3, Stereo Recorder /Pl:Vibuck System. Every- $101.00 ; 900 -4, $89.95 ; 900 -5, $126.25. Model thing required for stereo recording and play- TRP -21 record-play preamplifier, $124.95. back, including two VU meters and two power amplifiers and speakers. is incorporated in the Sony "Stereocorder" Model CS -300. A precision -built instrument in all respects, it UHER incorporates a hysteresis- synchronous drive motor and affords instant selection of 7% Multi -use Stereo Tape Recorder. Combining and 3% drive speeds. Frequency response is a standard tape recorder with a provision for 50 to 15.000 cps ± 2 db at 7% ips; 50 to voice operation and automatic slide projector synchronization, the Uher Stereo Record III is an ideal machine for instructional use. Other features which make this machine ideal for school use are the ability to record sound- on- sound -playback on one track while re- cording on the other-and jam -proof controls. In addition this machine has all the features of a standard four -track stereo /mono mn- chine; ability to play 2 and 4 -track tapes, digital counter, hysteresis- synchronous motor, stereo record and playback, 3 speeds, electron - eye level indicators, and a frequency range fiers, two for recording and two for playback. of 40 to 20,000 cps. The unit is completely The pause control achieves precise pick up on stop- and -go recording or playback. Fre- quency response is 30 to 20,000 cps at 7% 30 to 15,000 cps at 3% ips ; and 50 to 7ts;000 cps at 1% fps. Mutter and wow are 0.1, 0.2, and 0.25% at the three respective speeds. The Series 6 incorporates n hysteresis syn- chronous drive motor, military -type printed 10.000 cps at 3% ips. Flutter and wow con- circuitry, and special toroid-type windings on tent are less than 0.15% at 7% ips and less the power transformer to cancel stray hum. than 0.25% at 3% fps. Stacked high -frequency The 4 -track stacked erase head selectively erase head erases both channels when record- erases 1 or 2 tracks. 6 inputs are provided; ing stereo, or one channel (half track) when 2 each for microphone, high level, and low recording monophonically. Individual level level. Tnndberg of America. Inc.- 8 Third controls are provided for each channel to per- Ave., Pelham, N. Y. User net price. $498.00. mit recording sound -on- sound. Automatic rec /pbk sys $489.00 tape lifters protect recording heads and tape 5 -2, stereo during fast forward and rewind. Pushbutton 4, mono rec /star pbk sys 349.50 operation is provided for on /off. and selection of stereophonic or monophonic mode. De- signed for portable use. the CS -300 will satisfy TELECTRO the most fastidious user. Superscope, Inc., -2I Sun Valley, Calif. User net price, $399.50 in- Series 900 Tape Decks and TRP Record/ self- contained since playback amplifiers and cluding two F -7 microphones. Play Amplifier. The Series 900 offers a variety are built Distributed United of facilities in a simple tape-transport mecha- speakers -in. in -SL, 4 -track mono / siero rec $199.50 nism electronic equipment. For those States solely by Warren Weiss Associates, 262 without Broadway, New York 19, N. Y. User net 101, 1/2 mono rec a recording system, in- 1650 -track 9950 who wish complete price. $399.50. Akustomat accessory which cluding record and play amplifiers and the provides voice operation and slide projector necessary bias oscillators. the Telectro line synchronization, $44.95. STUZZI includes the Model TRP -21 record /play pre- amplifier, which provides for recording from Portable Transistorized Tape Recorder. The low -level microphone input or front a high - Stuzzi Magnette is a fully transistorized, bat- level source such as a tuner, and in the play VIKING tery operated, completely portable tape re- mode has an output of approximately 5M corder. Manufactured in Austria, the Mag- volts. Controls on the TRP -21 include a re- Two -Speed Stereo Integrated Tape Recorder. nette weighs only 8 pounds and achieves cord /play selector, equalization switch, noise The new Viking Stereo -Pro is a high perform- performance equal to more expensive heavier balance, and gain control. Recording level is ance integrated tape recorder with dual re- units. The self-contained speaker system pro- shown by a VU meter. The tape transport cording and playback preamplifiers. This unit vides fine tone quality for music, dictation, or itself is available in five forms, depending on combines the Viking 85 deck and two Viking conference recording. Vibration proof, the the head complement. Model 900 -1 is equipped RP62 recording amplifiers. The Stereo -Pro is Magnette incorporates a 7- transistor, 2 -diode for monophonic recording and playback and designed for quick set -up and utmost portabil- amplifier which provides ample volume and for 2- or 4 -track stereo playback ; 900 -2 has ity. Unit has tape -reel storage compartment

AUDIO AUGUST, 1960 91 below amplifiers, front -panel mounted high 15,000 cps. Usable in both stereo or mono- level inputs, microphone jacks, and output phonic systems, it comes complete with a plug jacks for monitoring and music system. The and jack that connects easily to any amplifier 85 is the finest Viking deck designed for the or directly across speaker leads. Soft sponge home music system. Containing two motors - foam ear and headpieces provide comfortable one for record, the other for fast forward, re- wearing and shut out 95% of outside noise. wind and footage counters -it uses a dual -con- Impedance 4 ohms. Koss, Inc.. 2227 North 31st centric switch knob to control all mechanical Street, Milwaukee 8, Wisconsin. User net price, operation. The Inner knob controls forward, $24.95. stop, and edit functions, while the outer ring controls fast -forward and rewind. Universal head-mounting bracket permits changing or MICROTRAN adding to the head complement at will. All models are equipped with long- wearing lami- Bulk Tape Eraser. The Model HD -11 re- nated heads, tape lifters, non -resonant pres- duces the residual sound level of typical fresh virgin unrecorded tape by 3 to 15 db depend - ing on its previous exposure to stray magnetic fields. In addition it provides a 75-db mini- --.011 i1itY mum erasure of saturated . These Utilizes a bakelized conical diaphragm and a moving coil type driver. Wired for stereo, they may be utilized for a monophonic system. Sen- sitivity at 1000 cps is 35 db above 1 dyne /cmz for 1 mw input. Will handle inputs up to 1F2 watt. Type IC headphones conne complete with rubber ear cushions and a highly flexible, 6 -foot, one piece, nylon covered cable. British Industries Corp., Port Washington, N.Y. User net price, $28.95 (52 ohm) ; $34.50 (600 ohm) ; $36.50 (15,000 ohm).

GOTHAM Dynamic Audiometry Headphones. Featur- ing a frequency range of 20 to 15,000 cps and demagnetization levels are achieved by using a sensitivity of 25 my for a sound pressure electrical grade laminations combined with a level of 100 pions, the Beyer DT-48 dynamic vacuum impregnated heavy duty coil. Spindle sure pads and automatic tape run -out switch. headphones are mounted in earcushion en- mounting of reel permits rapid, thorough cov- Frequency response is 30 to 14,000 cps +3 db. closures. Their resonance-free performance erage without missed spots. Reels from 5 to Signal -to -noise ratio is better than 55 db. Flut- and the extreme frequency range, together 10% inches in diameter are accommodated. ter is less than 0.2% at 7% ips. The RP62 Adapter hub for NARTB wheels available. Mi- record /playback preamplifier is engineered to crotran Company, Inc., 145 E. Mineola Ave.. match the operating characteristics of the Valley Stream, N.Y. User net price, 85 deck. Bias oscillators may be synchronized $27.50. for stereo recording. NARTB tape equalization Telephone pick -up coil $4.77 is fixed in recording, variable in playback. Dis- tortion is less than 1.0% at indicated normal recording level. Viking of Minneapolis, Inc., 9600 Aldrich Ave., South, Minneapolis, Minn. User net price. Stereo -Pro ES (1h- track) $344.50, Stereo -Pro ESQ (1h-track rec/1/2 or '4 -track pbk) $374.50. Stereo -Pro RMQ (14- track rec /pbk) $374.50. MICROPHONES Stereo-Compact, 85 deck, two RA72 preamps $297.50 85 Series Decks 130 -179.50 RP62, rec /pbk preamp 77.50 AKG RA72, rec preamp 57.50 Dynamic Stereo microphone. Manufactured in Austria, the AKG Model D88 Is a dynamic microphone suitable for NV or MS stereophonic recording, as well as for monophonic record- TAPE ing. ACCESSORIES with very low distortion -less than 0.1% BIB from 50 to 15,000 cps, and less than 0.3% from 20 to 50 cps -makes them ideal for Tape Splicer. An indispensable accessory for audiometric testing of the human ear, as any tape recordist, this new British -made well as for professional monitoring for re- splicer is extremely simple to use and can cording or broadcast. Extremely rugged, none be employed both for mending broken tapes has been damaged so far by overload. Resistor and for editing purposes. Made of nickel - kit included with each pair makes connection plated brass, the BIB splicer comes mounted to hi -fl equipment simple, and bridging trans- formers are available for broadcast monitor- ing across 600 -ohm lines. Gotham Audio Cor- poration, 2 West 46th St., New York 30, N. Y. User net price, $79.60.

KOSS Stereo Headphones. Extremely useful for the tape recording enthusiast, Koss "Stereophones" model SP- provide complete separation of stereo channels. Consisting of a specially de- signed 31/2-inch reproducer in each earpiece, the SP -3 has a frequency range from 30 to f CHARACTERISTICS on a flock -sprayed base, or can be mounted Frequency range: 80- 15,000 cycles (flat, directly on any tape deck. The body of the stereo matched frequency response, falling splicer has two pivoted clamps which lock the slightly a the low frequency end). Sensitivity tape sections in a channel. Both vertical and of each system : low impedance, - 75 db re diagonal mitres are provided for either edit- 1V/dyne /cmnz; high impedance, -52 db re ing or mending. Horizontal mitres are also 1V/dyne /cm.. Output impedance of each sys- provided for use in trimming off surplus tem : 200 ohms, with transformer, 50,000 ohms. mending tape. Distributed in the United States Directional characteristic for stereo record- b Ercona Corporation, 16 \V. 46th St., New ings : double cardioid (the two systems are so York N.Y. net price, $3.95. arranged that their directions of maximum 36, User sensitivity (live side of microphone) form an angle of 90° to the horizontal). Directional S. G. BROWN characteristic for monophonic recordings: broadangle cardioid. Unchanged recording di- Type K Professional Headphones. Actually rection for stereo and monophonic recordings. two miniature high -quality speakers, the type Electronic Applications. Inc.. 194 Richmond K headphones can be connected to any sound Hill Ave., Stamford, Conn. User net price system, tape recorder, or similar equipment. D88 /200, low impedance, $72.00 ; D88 /Hi, Frequency range is 50 to over 10,000 cps. high impedance with cable transformer, $77.50.

92 AUDIO AUGUST, 1960 designed to operate at considerable distances Output level: Omnidirectional, -72 db; cardi- AMERICAN from the sound it is picking up. For this old, - 70 db. reason, It will permit a far greater degree of Impedance : 200 ohms. Dynamic and Ribbon Cardioid Microphone. TV camera flexibility than has heretofore Finish : Gray with satin chrome. A versatile microphone of exceptional quality, been possible, especially in intimate dialogue Dimensions : 7. 11/16" X 1 x 1- 13/16" d, with the American DR330 is made to the most ex- scenes where camera placement has been gov- cradle. acting requirements of radio-television broad- erned largely by the ability of the microphone Weight : Microphone, 1 lb. Power supply, 6 casting and motion picture recording. Car - to pick up voices of the performers. The 644 lbs. dioid, bi- directional or omnidirectional polar uses a combination cardioid and distributed User net price. C -37A system complete includ- patterns. Smooth frequency response from 40 front opening, enabling it to maintain proper ing power supply, $295.00. to 15,000 cps. Polar patterns and impedance response far away from a sound source. Its Superscope, Inc., Audio Electronics Division, are quickly changed by removing nameplate front effective acceptance angle is 45 deg. on Sun Valley, Calif. and adjusting linkage bars. Combined, matched each side of center. Random noise cancella- ribbon and dynamic units incorporate a new tion from the rear and sides exceeds 20 db. CR -4, wireless microphone system .... $250.00 principle in the relative placement of pressure Frequency response is smooth from 40 to 12,- and velocity units, resulting in electrical can- 000 cps. Weight is 2 lbs. 9 oxs. Electro- Voice, cellation over an extended frequency range. Inc., Buchanan, Mich. User net price, $110.00. TURNER Built -in, shock-proof mount gives extra pro- Micro- tection. "Slide- Lock" permits easy removal Combination Impedance Dynamic Mfg. phone. Specifically designed for AM, FM, and from stand. American Microphone Co., TV broadcast use, especially in the studio, the Division of GC Textron Electronics. Inc., PRIMO very useful for Rockford, Illinois. User net price, $250.00. Turner model 210A is also Dynamic Microphone. Designed for use with high fidelity applications and excellent for portable transistorized tape recorders, the DM -168 microphone is a small sealed unit DYNACO mounted in a molded plastic case and fitted with a remote control switch. Frequency re- Ribbon Microphones. Suitable for the high- est quality recording and broadcasting appli- cations, the Dynaco-B & O Model 53 micro- phone uses a replaceable duralumin ribbon only .0001 ht. thick and weighing 1.3 milli- grams. The extremely small mass eliminates resonances within the audible range. The unit is bidirectional, which allows controlled dis- crimination of the pick -up area and facilitates

spouse ranges from 100 to 9000 cps with a deviation of 8 db, making it particularly suitable for voice use. Output impedance is stereo recording. Very wide frequency range 600 or 50.000 ohms. and the switch contacts coupled with smooth response. Non -directional are capable of controlling 200 ma d.c. at 24 u sCoomm-- volts. Primo Co. Ltd., 2043 Mure, Mitaka -shi, what l attthe0highfrequencies. Tokyo, Japan. output impedance of 50 ohms- (35/80 - ohm input) or 200 ohms (150/250-ohm input) SONY selected at the terminal end of cable. CHARACTERISTICS Variable- Directional -Pattern Comics., r M{- Frequency range : 40 to 20,000 cps. crophone. The Sony C -37A is designed for pro- fessional recording and broadcast application Pattern : Omnidirectional. where utmost performance. dependability. and Output level : 50-ohm, - 8G db ; 200 -ohm, - 80 fidelity are essential. Frequency response is db. impedance : 0 db = 1 volt per microbar stated to be entirely free of resonant peaks Output and dips within the specified range of 20 to 50/200 ohm. Finish : Non -reflecting neutral brown. 18.000 cps. The C -37A is operated in conjunc- Microphone Co.. Cedar Rapids, 2 power supply unit. The Turner a natural balance of the primary pick -up with tion with the Model Cl'- Iowa. User net price, $125.00. This company room acoustics. When used with the Stereo- This power supply incorporates a variable makes a complete line of microphones. Write Spacer-an acoustically absorbent "partition" switch permitting three different frequency for information. between the microphones-these units provide characteristics for complete versatility in any the effect of 10 -ft. separation while avoiding acoustic surroundings. A small screw switch unnatural ping-pong effects typical of poor on the back of the microphone housing offers stereo. A 3- position switch provides music, a choice of uni- directional cardioid pattern, or speech, and off positions, and a built-in trans- conventional omnidirectional pattern. Micro- former enables operation at 50, 250, or high phone and power supply may be separated by impedances. Model 50 is identical in all par- as much as 240 feet without affecting per- MISCELLANEOUS ticulars except output Impedance, which is formance characteristics. fixed at 50 ohms. CHARACTERISTICS CLAROVOX CHARACTERISTICS Frequency response: 20 to 18,000 cps ± 2.0 db. Frequency range: 30 to 13,000 cps. ± 2.5 db. Pattern : Choice of cardioid or omnidirec- Record Handler. Especially designed to pre- Pattern: Didirectional. tional. vent damage to records during handling. the Output impedance: Model 53-50, 250, or Clarovox '1lfiragrip" enables any record to be high Model 50-50 ohms. picked up with ease and firmly held without Dimensions : 7%" 1 x 1 3/16" dia. leaving visible or audible marks, and with no Dynaco, Inc., 617 N. 41st St., Philadelphia 4 danger of slipping. The pliers -like design is Pa. User net price, Model 53, $59.95 ; Model such that the Miragrip can be conveniently 50, $49.95. used with one hand, as negligible effort is needed to hold the record absolutely firm. The metal handles are chrome-plated and the rub- ber gripping sleeves are available in a variety ELECTRO -VOICE of colors. The Miragrip is manufactured by Clarovox Products of Coventry. Eng., and is "Sound Spot" Microphone. A new concept in by 644 was distributed exclusively in the United States directional microphones, the Model Ercona Corporation, 16 W. 46th St., New York 36, N.Y. User net price, $4.95.

AUDIO AUGUST, 1960 93 CONRAC "FLEETWOOD" High- Quality TV Chassis. The Fleetwood Model 11100 is a wall, partition, or cabinet - mounting 23 -inch TV receiver with remarkable audio and visual performance. The sonic wire- You less remote cont rot tuning unit provides at -the- chair controls for channel changing, volume Say AUDIO Is Publishing A

Cookbook? adjust, and on /off. The remote control unit is a fully transistorized transmitter and the re- ceiver is a five -tithe. delayed -act inn system. The Model 1000 uses a 2:3 -Inch, 110 -degree pic- ture tube which permits an over -all set depth of only 15 27/32 inches. A high -fidelity audio Yes, AUDIO is channel affords faithful reproduction. Two publishing a cookbook - push himself away from the table before separate audio outputs are provided; one for not that we intend to extend the subject upsetting the daily calorie count." connection to a loudspeaker, the other for of gastronomy to include recipes in connection to a high- fidelity system. Connie. fu- Here is Inc., Glendora, Calif. Also available as non - ture pages of AUDIO. a cookbook that will enable you remote, model 1010. to recreate in your own homes superb You may ask...why? dishes experienced only at the Mirror ELECTRODYNE Lake Inn -dishes like Lake And we would answer -Simply because Trout Baked Program Equaliser. The model 251 -A Equal- we feel that people who read AUDIO, In Wine and Adirondack Apple Pie, rec- izer is Electrodynee ndnhttruization of an ipes instrument that has long been standard for and enjoy the finest quality music repro- for which are reproduced below - corrective equalization in recording and repro- duction also enjoy really good duction of sound. The small size of the 251 -A food on tAKE TROUT BAKED IN WHITE WINE permits mounting close to mixer controls. Two their tables. Remove heads and tails from a 2.pound fish. Split open down sliding levers are provided-one for equnliza- back and rime well. Remove backbone and rub inside with lemon, Your next question may be.. As pepper it a dif- ult. and thyme to caste. Knead 1 tablespoon of butter ferent kind of cookbook? and anchovy pate the site of a large pa; placing mixture inside fah. Place fish in a greased baking pan and cover with 34 asp Of course our reply would be -Yes! Oh, of whin wine. Bake 25 to 30 minutes in moderate oven, 350 it doesn't have a revolutionary format degrees. Baste frequendy. Garnish with parsley and lemon and it appears to look like any ordinary and serve with plain boiled potatoes. cookbook. But, the secret of its goodness ADIRONDACK APPLE PIE is the recipes that fill its 148 pages... I c. sups s tbsps. white core' syrup recipes responsible for the 2 'baps. sifted flour 6 to 8 tart apples, thinly heart warm- 14 up. grated nutmeg sliced ing, flavorsome, c. orange homespun aromas expe- 34 juice PWttY rienced only in the kitchen of an Adiron- 54 c. melted butter dack country home. Mix together the sugar. flour. nutmeg. orange juice, tom syrup and melted butter. Add the sliced apples and mix thorough- The name of ly. Butter a pie pan heavily before putting in your pastry. Fill the the book is PLACID pie shell with EATING, and is the appk mixture and make pastry strips for the it chock full of palate - top which should be dipped in melted butter before putting on tempting recipes compiled by Climena the pie. Bake in 400 degree oven for 15 minutes: reduce heat to M. Wikoff, owner of the Mirror Lake Inn 250 degrees and hake 35 to 40 minutes longer. ..,at (you guessed tlon and the other attenuation. The 251 -A is it) Lake Placid, New This colorful book, plastic a passive LCII, bridged -T network. which does York. bound for easy not require a power supply and therefore can handling, will contribute many wonder- be inserted directly into a transmission line. Actually, the ful adventures Impedance is 600 ohms in an out, and inser- first edition (now out of in food for everyone in tion loss Is 14 db. Electrodyne Corp., 50:3 print) was discovered by Mr. AUDIO the family. Order a copy today, the Lady- South Grand Ave., Santa Amt, Calif. User net (C. G. McProud) during his stay at Mrs. of- the -house will adore you for it. Inci- price, $260.00. Wikoff's Mirror Lake Inn, where, in dentally...it makes a wonderful 1001 -A, straight -line mixer control ... $ 40.00 Mr. gift for 201 -A. microphone ampi 150.00 McProud's own words-"... every meal is anyone. PLACID EATING, 152 pages, so tasty that Plastic eating becomes a real joy, Bound: $3.95. GARRARD where each night's dessert excels the one from the night before, where Stylus Pressure Gauge. The Garrard Model one has to SPG3 is an accurate, easy -to -use stylus pres- sure gauge with an extremely modest price tag. ME It features a large, legible scale. visible through a clear plastic window, with widely spaced grant markings. It can be used either RADIO MAGAZINES, INC., Dept. K99 to check the weight of the tone arm or to set P.O. Box 629, Mineola, New York Enclosed is my remittance of please send me copies of PLACID EATING @ $3.95 each. (No C.O.D., all books sent postpaid in U.S.A. and possessions, Canada, and Mexico. Add 50c for Foreign orders.)

NAME ADDRESS

CITY ZONE STATE

94 AUDIO AUGUST, 1960 n pre -determined weight. It comes complete with a 5 -grant brass weight, which is used as a standard so that the unit can be "zeroed" to insure utmost accuracy. The scale pan is ELECTRONIC plastic to avoid damaging delicate styli. The SPG3 can be used with any cartridge or arm. Garrard Division of British Industries Corp.. Port Washington, N.Y. User net price. $2.9:5. ORGAN KIT HOMEWOOD INDUSTRIES SCHOBER Electronic Organ Kits. Offering two models, Furniture Fini. hing Kit. rurn -A- Finish Kit the Concert and the Consolette, the Schober is intended to aid the "do- it- yourselfer" who Organ kits represent a novel approach to the is constructing high- fidelity furniture and en- construction of professional musical instru- closure kits. Available in mahogany, walnut, ments. By dividing the organ into a number golden oak, fruitwood, maple, cherry, ebony, of relatively inexpensive subassembly- kits, the harvest wheat (blond), and natural finishes. individual may assemble the organ as fast or the kit comes complete with Instructions for controls at the maximum position. Frequency response is 50 to 15,000 cps ± 1 db. Total har- monic distortion is less than 0.2 %, with a 400 cps tone applied at a level of - 50 dbm. Noise is at least 68 db below the signal level for an input of -50 dbm. Sigma Electric Co., 11 East 16th St., New York 3. N.T. STATIC MASTER Record Brash, The Staticmaster record brush Model 3ß500 employs a polonium strip as a static neutralizer to make cleaning records rapid and simple. The brush of the Static - master is macle of genuine Jaguar hair which is both strong and soft. Nuclear Products Co.. 10173 East Rush St., El Monte, Calif. User net price, $14.95.

aiding even the most inexperienced finisher. slowly as he desires, one kit at a time. with a Enough material is supplied to finish 30 square starting investment as low as $18.94. The Con- feet with a double coat of top varnish. The cert Model, when finished, meets the standards kit consists of five containers of finishing ma- of the American Guild of Organists and rep- terial, brush, and three large sheets of 7/0 resents a commercial value of $3000 to $4000. and 5/0 sandpaper. Homewood Industries, Kit cost is approximately half that amount. Inc., 26 Court Street, Brooklyn, N.Y. User net The Consolette is a full -range organ smaller price, $3.88. than a spinet. Its commercial value is more than $1800. Write for prices and descriptive literature to Schober Organ Corp., 2248 Broad- LAFAYETTE way, New York 24, N.Y. Dual channel VU Balance Meter. The La- fayette TM -66 provides a solution to the prob- lem of balancing stereo. Utilizing two sepa- rate coils in a single magnetic field- each stereo channel feeds a separate coil through a full - wave bridge rectifier. When the signals are THE QUESTION: Do you know where you can find information about equal and balanced the meter will not deflect. Individual channels can be measured sepa- the current articles in magazines about microwaves, loudspeakers, television rately. Lafayette Electronics Mfg. Corp., 104- repairing, electronic musical instruments, traveling -wave tubes, transistor 46 Dunkirk St., Jamaica 12, A.Y. User net price, $11.95. amplifiers, oscilloscopes, or any other electronic subject?

ROBINS THE ANSWER: Complete Accessory Line. Everything the recordist or audiofan needs in the way of con- veniences seems to be available front Robins Industries. Included are a bulk tape eraser. record changer covers in three colors. tape reel holders, spot tape eraser, and so on. The changer covers are : model CC -6 in white, CC -7 in brown, and CC -8 in clear, all with list prices of $6.95. The covers are 15. x 12 x 5 in. Tape reel holders are designed to hold j reels on vertically mounted recorders and to hold warped reels steady. List price is 850 for a package of 2. Model SD -1 Strob -Dise provides a simple, easy, and inexpensive check of accuracy of turntable speed simply by view- ing with 60 -cps light. While the disc may be viewed by incandescent light, the complete RADIOFILE kit of disc and neon viewing lamp gives a much easier -read indication. List price of disc and light, $1.50 ; disc alone, 500. For Not a new publication, but one which for over ten years has served engineers, turntable leveling, the ESK-4 kit will fill the libraries, experimenters, researchers, hobbyists, radio amateurs, radio and TV bill. It consists of four adjustable rubber Covers radio, feet for mounting under the turntable base repairmen, and anyone else connected with radio or electronics. and a level for mounting on the turntable television, electronics, and related subjects, and published bi- monthly as a plate. The feet are adjustable in height. al- cumulative index throughout the year, with the last issue of the year an lowing exact leveling. List price. $3.50. record of all electronic periodical Robins Industries Corp., 36 -27 Prince St., Annual which may be kept as a permanent Flushing 59, N. Y. literature. LECTRODEX -the electronic magazine index -has been expanded to in- SIGMA clude over twenty five publications in the radio and electronics fields. Sold by subscription only, $3.00 for one year, $5.50 for two years. Back Annuals Professional 4- Channel Audio Mixer. The 1949, 1951, 1952, 1953, 1954, 1955, Sigma Model SA3761 is a professional audio are available for the years 1947, mixed which permits mixing four different 1956, 1957, 1958 and 1959 at $1.00 per Annual Postpaid. Order your audio inputs and delivers n common output subscription and Annuals today! ! ! signal. It was designed expressly for broad- cast studios and central sound systems. It will feed directly into the microphone input of Ampex Tape Recorder Models 402. 403. and RADIO MAGAZINES, INC. 350 and, with an adapter cable, into Models 400, 400A, 401, and 401A. The mixed contains four separate amplifiers with individual, pro- P.O. Box 629, Mineola, N. Y. fessional -grade potentiometers, to adjust gain. The mixed introduces 8 db of gain with all

AUDIO AUGUST, 1960 95 ADVERTISING LAFAYETTE RADIO EQUIPMENT INDEX AVAILABLE THROUGH A SELECT GROUP OF AUTHORIZED FRANCHISED DISTRIBUTORS!

Lafayette Radio, world's foremost electronics and hi -fi supplier, Acoustic Research, Inc. 49 Acro expands Products Co. 2 its facilities to serve you better. After careful screen- Advanced Acoustics Corp. 79 ing, a select group of representatives AIWA Co., Ltd. 74 has been appointed as Allied Radio Corp. 84 Authorized Franchised Distributors of Lafayette's own top Altec Lansing Corporation 36. 37, 38 American Electronics, Inc. quality equipment and stereo kits. Lafayette dependability, American Concertone Division 71 plus your dealer's Amperex Electronic Corp. 76 reliability and facilities, guarantee you the Apparatus Development Corporaton 87 finest in quality and service. Audio Bookshelf 82 See your authorized dealer, or shop Audio Devices, Inc. 13 Audio the Lafayette catalog know you'll Fidelity Records 61 -we be satisfied. Audion 87 Audio Unlimited 87

Bell Telephone Laboratories 18 Professional Stereo Pre -Amp Bogen Presto Company 84 Bozak 55 Master Control Center British Industries Corporation 3, 47 The Lafayette KT -600 is unquestion- ably one of the most flexible stereo Center Electronics Co., Inc. 87 Classified KT -600 control units available today. Its flexi- 86 bility is complemented by overall per- Connoisseur 15 formance comparable to manufactured units selling for far more than its Dynaco, Inc. 78 modest price," EICO 11 HIGH FIDELITY MAGAZINE-OCT. '59 Electronic Applications, Inc. 5 Electronic Organ Arts 85 Electro -Sonic Laboratories, Inc. 85 Stereo Tuner Kit Electra- Voice, Inc. 59 "The assurance of success lies in the Electro -Voice Sound Systems, Inc. 87 excellent design of this Tuner, the Ercona Corporation 15 thoughtful manner in which it was planned for assembly from a kit of Fairchild Recording Equipment Corp. 33 parts, the use of RF and IF printed KT -500 Ferrograph 15 circuit boards in the FM sections, and Fisher Radio Corp. 9 the very complete illustrations and Fukuin Electric (Pioneer) 35 Instructions. You will have reason to Fukuyo Sound Co., Ltd. (Coral) 87 be proud and pleased with the results." General HI-FI MUSIC at NOME July -Aug 19581 Electric 68 Gotham Audio Sales Co., Inc. 87 Grado Laboratories, Inc. 72 A 50 Watt Integrated International Stereo Amplifier Kit Electronics Corp. (Mullard) 63 JansZen Loudspeakers 65 Simplicity, versatility and handsome Jensen Manufacturing styling have been Integrated Into this Company 57 outstanding watt KT-230A 50 stereo amplifier Key Electronics 87 watts A (25 each channel). full range Kierulff Sound 81 of controls and inputs assure complete Corporation KLH Research 6. Development flexibility. You build an amplifier com- Corporation 62 parable in every way to a factory wired Koss, Inc. unit. 80 Lafayette Radio 96 Lansing, James B., Sound Inc. 51 NOW AT AUTHORIZED LAFAYETTE DISTRIBUTORS Madison Fielding by Crosby Electronics, Inc. 53 CALIFORNIA INDIANA MICHIGAN McIntosh Laboratories 45 BERKELEY MUNCIE FLINT Movic Company, Inc. 79 oacKIT Corp. Muncie Electronics, Inc. KLA Labs. LONG BEACH GROSSE Neat Onko Denki Co., Ltd. ¢ KlerulR Sound Corp. KENTUCKY POINT LOUISVILLE KLA Labs. Neshaminy Electronic Corp. 65 LOS ANGELES Newcomb Audio Kierultt Round Corp. The Golden Ear NEW JERSEY Products Co. 75 LOS ANGELES -WEST North American Philips Co. 12 KlerulR Sound MARYLAND ATLANTIC CITY Corp. BALTIMORE Almo Radio ORANGE Paco Electronics Co., Inc. 83 KlerulR Sond Corp. American Distributing Co. CAMDEN Pickering PALO ALTO The Hi Fi Shop Almo Radio & Company 17 Zack Electronics COLLEGE PFC. Pilot Radio Corporation 7 RIVERSIDE Rucker Elec. NEW YORK Primo Company Limited 85 KlerulR Sound Corp. SALISBURY B ING HA M PION Almo Radio SANTA BARBARA Stack Electronics R&A 15 ...KIT Corp. SILVER SPRING Rucker ELMIRA Radio Corporation America SAN FERNANDO VALLEY Elec. Stack Electronics of .... Coy. II KlerulR Sound Corp. Reslo 15 MASSACHUSETTS ITHACA Rider, John F., SAN FRANCISCO HOLYOKE Stack Electronic, Publisher 87 Zack Electronics Roberts Electronics, Inc. 73 SANTA ANA KTC Electronics ROCHESTER GREENFIELD Craig Audio Lab KlerulR Sound Corp, Sansui STUDIO CITY Del Padre Supply SYRACUSE 80 PITTSFIELD W.G. Brown Sound Co. Sargent -Rayment Co. KlerulR Sound Corp. Del 81 Padre Supply Scott, H. H., Inc. 69, 77 SPRINGFIELD PENNSYLVANIA Sherwood DELAWARE Electronics Laboratories 1 WILMINGTON Del Padre supply NORRISTOWN WORCESTER Almo Radio Shure Brothers, Inc. 67 Almo Radio Co. Del Padre Supply PHILADELPHIA Sonotone Corp. 4 DISTRICT OF COLUMBIA Almo Radio (3 Locations) Stereo -Parti 87 Rucker Electronics MICHIGAN Superscope, Inc. 29 ALLEN PARK VIRGINIA INDIANA KLA Laboratories FT. WAYNE BIRMINGHAM ARLINGTON Tannov (America) Ltd. 81 Ft. Wayne Electronics KLA Laboratories Rucker Electronics Transis- Tronics, Inc. Coy. IV Supply Co. DETROIT Tung -Sol 14 INDIANAPOLIS KLA Laboratories CANADA Graham Electronics Supply, Hudson's Northland MONTREAL Inc. P. Q. Uher Hudson's Downtown Electronic Tube Co 64 United Audio 70 University Loudspeakers, Inc 31 L F I A A Y E T T E R A D O Viking JAMAICA. N. Y. NEW YORK. of Minneapolis Cov. 111 N. Y. BRONX, N. Y. Vitavox 15

NEWARK. N. J. - PLAINFIELD, N. J. BOSTON, MASS. Weiss, Warren, Associates 64 Circle 88

96 AUDIO AUGUST, 1960 v 1 NEW IKING STEREO -COMPACT IS Tl t PtRFECT MEMORY FOR YOUR HOME MUSIC SYSTEM Viking neatly combines its famous 85 tape deck with the superb RA72 recording amplifiers to give you a stereo unit unequalled for performance and quality. The "STEREO- COMPACT" enables you to make stereo tapes from records ... AM /FM broadcasts .. . and live program material with recording fidelity to satisfy the most demanding and simplicity of operation to delight even a beginner. This package is designed for installation in wall or fur- niture, mounts in a 12V22 " square cutout. Best of all, the Viking "STEREO- COMPACT" is yours a AVAILABLE IN TWO MODELS: at surprisingly low price. Get complete information .. . visit your authorized Viking dealer or write Viking STEREO -COMPACT ESQ -half -track erase and record of Minneapolis. ing heads and short-gap quarter-track play models. STEREO -COMPACT RMQ- Quarter -track recording model with exclusive wide -gap recording head and short- gap play heads. Both models play %and /or '/, track stereo tape.. rag OF MINNEAPOLIS, INC. 9600 Aldrich Avenue So., Minneapolis 20, Minnesota

Sold exclusively through quality high-fidelity dealers. TEC has no tubes...TEC alone generates no tube heat, no hum, no microphonics. TEC alone provides such superb transient response. Precision engineering permits TEC to make a two year guarantee on both parts and workmanship. See detailed specifications below and listen to a TEC all transistor amplifier soon for unparalleled sound. General specifications: TEC s -25 stereo preamplifier - amplifier. Power rating: music power output each channel 34 watts. Frequency response: 20- 20,000 cps. Harmonic distortion: 0.7 %. Intermodulation distortion: 0.9 %. Power requirements: 117 vac or 12 to 18 volts dc. 70 watts maximum at full power, less than 15 watts at normal listening levels. Hum: inaudible. 16 inputs. Outputs: 4, 8,16 ohm for each channel, tape recorder outputs for each channel, and a mixed A+ B for a 3rd channel. TRANSIS- TRONICS INC. (TEC) 1(5(J ?1st Stiert, Santa Monica, California

R 68 WA

unique all transistor high fidelity preamplifier- amplifier