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Audioelinie- Joseph Giovanelli 2 Letters 6 Speaker Phasing with an Oscilloscope-Bob E

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Audioelinie- Joseph Giovanelli 2 Letters 6 Speaker Phasing with an Oscilloscope-Bob E 1 1111 IN MAY, 1959 500 dveepsea6/62fre ahled4li,614-./ www.americanradiohistory.com 40 Watts MONOPHONIC... 20 Watts STEREOPHONIC... with RCA -6973 TUBES See her sitting there so neat. And I tell you very confidentially... the 6973's got POWER...real power for such a small "bottle ". Four of them, in twin, push -Full class AB' circuits, put 20 watts of power into each of two output- transformers to give you the brilliant stereo sound you dream about. With the flip cf a switch, you can parallel the twin circuits for 40 husky watts' monophonic power output. B:g on power.. small in size...long on low -cost design possibilities...everything about RCA's 6973 beam -power tube makes sweet news. Whether you'-e designing for monophonic or stereo high fidel ty, you'll want to hear the many other facts your RCA Field Representative car give you on the RCA -6773. For technical data, write RCA Commercial Engineering, RCA FIELD OFFICES EAST: 744 Broad 5t. Section E91 CE, Harrison, N. J. Newark 2, N. J. HUmboldt 5 -3900 RCA Tube Distributor RCA tubes for H.gh Fidelity also avail ble from your local Authorized MIDWEST. Suite 1154, Merchandise Mart Plaza, Chicago 54, III. WHiteholl 42900 WEST: 6355 E. Washington Blvd., OF AMERICA Los Angeles 22, Calif. RADIO CORPORATION RAymond 3.8361 Electron Tube Division Harrison, N. J. www.americanradiohistory.com MAY, 1959 VOL. 43, No. 5 Successor to RADIO, Est. 1917. AU D Io ENGINEERING MUSIC SOUND REPRODUCTION C. G. McProud, Editor and Publisher 4 Q,0 fn °t: N L Henry A. Schober, Business Manager m C Q, C L- ó C y N N 3 _ Harrie m w c Só K. Richardson, Associate Editor Ul'SCdE H L - 2 ',5 a`,;',7, Linda Sueskind, Assistant Editor á O°C d > VV N d Janet M. Durgin, m'o.ypÿ c )2 'a Production Manager tf ° Edgar E. Newman, Circulation Director o> °=8 ro .O°mU -a ° crnc ctd, .7.0u;g= o 3 "- Ñ . cs 03 C 15 Z N N C N>. w tÑ d Y O CO é; c - ` w* ¿- Sanford L. Cahn, Advertising Director O ' - t ¡, _ Á c _ MEMtFR Midwest Representative óipNTL t ó - V ú Vi« III 1 MA4y W. A. Cook and Associates _ p$ J Go eaa i .o 7^ 161 East Grand Ave., Chicago 11, Ill. LLa WoW )- West Coast Representative - « - ó+ C. ° _ N j ¡ óm i i lames Galloway ° w° ° Ñ /NC'S esr a ai 3 ÿ as N 6535 Wilshire Boulevard, Los Angeles 48, Calif. t-°ó a. d .C1-7 ~ U c O Ñ C 0 Ç :il.' 1° á a3d y_ iLLái' 3 I lif CONTENTS ÿ. 3 NsiN: G ff Audioelinie- Joseph Giovanelli 2 Letters 6 Speaker Phasing With an Oscilloscope-Bob E. Tripp 10 Audio ETC -Edward Tatnall Canby 12 Editor's Review 14 A Compatible Stereophonic Sound System-Floyd K. Becker 17 Moving Magnet Stereo -The new horizon of stereo disc reproduction - Herbert Horowitz 19 Negative- Supply Outboard Codan-Ronaid L. Ives 22 The Amplifier Distortion Story- Norman H. Crowhurst 24 The Tape Guide-What Kind of Tape Machine for your Audio System- Herman Burstein 30 Equipment Profile -Lafayette KT -600 Stereo Control Amplifier 34 Standard Methods of Measurements for Tuners -The Complete text of IHFM -T -100, adopted in December, 1958 42 Record Revue-Edward Tatnall Canby 48 Jazz and All That-Charles A. Robertson 54 New Products 60 New Literature 63 Coming Hi Fi Shows 63 About Music -Harold Lawrence 64 Industry Notes & People 79 Advertising Index 80 COVER PHOTO -Music wall built by E. L. Phillips, Jr. for his home in Odessa, Texas. In the upper compartments are two McIntosh MC -60 power amplifiers and a Fairchild 411 -H turntable with Grado arm and stereo cartridge and a Calrad viscous damped arm with an ESL Concert monophonic cartridge. The center row contains a Garrard RC -88 changer with E -V stereo cartridge, a McIntosh C -20 stereo preamp (serial No. 6), Magnecordette stereo tape recorder and amplifier, Grundig TK -820 tape recorder (for background music), and drawers for tape storage, tools, spare cables, microphones, etc. Two Bozak 305 speaker systems at the bottom flank a record storage compartment. Cabinet cost, only about $450. AUDIO (title registered U. S. Pal. Off.) Is published monthly by Radio Magazines, Inc., Henry A. Schober, President; C. C. McProud, Secretary. Executive and Editorial Offices, 204 Front St., Mineola, N. Y. Subscription rates Possessions. -U. S. Canada and Mexico, $4.00 for one year, $7.00 for two years, all other countries, per year. copies 50t. $5.00 Single Printed In U.S.A. at Lancaster, Pa. All rights reserved. Entire contents copyrighted 1959 by Radio Magazines, Inc. Entered u Second Class Matter February 9, 1950 at the Post Office, Lancaster, Pa. under the act of March 3, 1879. RADIO MAGAZINES, INC., P. O. Box 629, MINEOLA, N. Y. Postmaster : Send Form 3579 to AUDIO, P. O. Box 629, Mineola, N. Y. AUDIO MAY, 1959 www.americanradiohistory.com AUDIOCLI N IC?? GRADO JOSEPH GIOVANELLI Deemphasis and Time Constant blesome when connect c,i as .amplifiers. This results partly from the direct con- Q. I have a Browning RJ48 tuner which nection to the power line and partly be- which has given exemplary service since cause of poor grounding in such circuits. 1954. Its FM response has a rising char- Poor grounding is made necessary in order acteristic to 10,000 cps, which snakes it to isolate these circuits from the line. This slightly on the bright side, which is not isolation, in turn, is made necessary to too objectionable; but I have lately added minimize the shock hazard and to conform a tape recorder and the high- frequency to U. L. requirements. The first of these "Truly boost in the tuner together with the high - outlined conditions may be remedied by frequency boost in the recording equali- placing an isolation transformer between zation causes a most unpleasing sound on the set and the power line. One side of playback. The de- emphasis network at the the primary of this transformer should be the discriminator of the tuner consists of a bypassed to B minus with a 0.05 -µf series 7.5,000 -ohm resistor, followed by a capacitor, of 400 volt d.c. rating. 620 µµf capacitor to ground, with the If this procedure proves unsatisfactory, world's signal taken off the capacitor. we must improve the grounding. This is in 1. How can I change this network to give addition to using the isolation transformer. me flat response? (Use of this isolation transformer elimi- 2. What is the method used to calculate nates the shock hazard which might other- finest..." the time constant? John A. Roberts, wise result after the readjustment of the Quebec, Canada. ground lead.) A. The values in the de- emphasis net- 1. Connect B minus directly to the chassis. work of your Browning RJ48 tuner should 2. Connect the return for the tuner input be a 75,000 -ohm resistor and a 1000 µµf to the point at which the first audio ampli- capacitor. However, the a.c. resistance of fier stage is grounded. the discriminator is approximately 10,000 ohms and is in series with the de- emphasis The Pickering Stereo Cartridge network. Therefore, the actual value of the external resistor to be used is 65,000 Q. tlfy original monophonic setup worked io stereo, ohms since this value plus the 10,000 ohms very well. After I switched I difficulties with my Pickering STEREO CARTRIDGE $49.50 inherent in the discriminator itself is equal experienced When this to 75,000 ohms, the correct value needed stereo cartridge. I connected COMPATIBLE WITH cartridge to the input terminal (specifi- Monaural Vertica for the time constant of the de- emphasis Lateral cally marked "Pickering ") of my pream- Stereo Westrex Mime network, 75 microseconds. The time constant in microseconds of plifier, I obtained almost no gain. also, that the cartridge when STEREO TONE ARM $29.95 a resistor and capacitor in series may be I noticed, figured by assuming the capacitor to be tracking at 2 -4 grams, has considerable Finest Wolnul Woo'` distortion, especially at the high end. 4 Shlel : in micro- microfara.ds and the resistor to Wires and conditions? he expressed in terms of megohms. By How may I correct these multiplying resistance by capacitance, you Harry Hausman, Weirton, W. Va. will then have the time constant of the A. The new Pickering stereo cartridge network in microseconds. has relatively low output as opposed to the older monophonic cartridges for which the Interconnecting a.c. Equipment with Pickering terminal on your preamplifier AC -DC Receivers was designed. The cartridge, therefore, should be plugged into the high -gain input, Q. My problem concerns strong hum normally used for GE inputs and the like. ..+....... after connecting an FM tuner into an AC- The original Pickering stereo cartridge DC receiver which has the input specifically cannot track at 2-4 grams, because this is marked: "for FM tuner, TV sound, phono." not sufficient force to push the stylus shank This sounds as though it was meant for parallel to the face of the disc and, there- connecting a.c. devices. The receiver has fore, in line with the polepieces. A 6-8 push -pull output and a phase inverter, and gram tracking force should provide the the usual series-connected filaments. It also best results. There is a new T -bar stylus has a shunt resistor- capacitor connected assembly, however, which will track at the from B minus to chassis ground.
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