THE AUTHORITATIVE MAGAZINE ABOUT HIGH FIDELITY APRIL 1976 75C 47425 20,000 -Watt Home Hi-Fi System AmericanRadioHistory.Com PIONEER HAS DEVELOPED «; A RECEIVER EVEN MARANTZ, KENWOOD AND SANSUI WILL HAVE TO ADMIT IS THE BEST. AmericanRadioHistory.Com OU.S. PIONEER ELECTRONICS CORP., 1976. AmericanRadioHistory.Com April, 1976 "Successor to RADfQ Est. 1917" Vol. 60, No. 4 with. Feature Articles 32 Understanding the NAB EQ Standard/Herman Burstein the 44 20,000 Watt Home Hi-Fi/Richard S. Burwen 74 "Celebrating the Duke"by Ralph J. Gleason/Dan Morgenstern best: Equipment Profiles 60 Otari MX-5050-2SH/George W. Tillett 62 Sound Guard Record Preservative/B. V. Pisha First compare °fouls 64 Mark Levinson JC-2 Preamp/Bascom H. King to the Stax UA -7M4 70 Allison:One Speaker System/Richard C. Heyser Polymer damped Jeweler bearings-no Record Reviews knife edges to chatter or uni -pivots to flop 76 The Column Gold -flashed contacts, 88 Canby's Capsules/Edward Tatnall Canby leads, pins and cab -es. 89 Classical Reviews/Edward Tatnall Canby Interchangeable head - 92 Jazz & Blues shells of resonance-f-ee cast aluminum. Audio In General Patented anti -skate system 4 Audioclinic/Joseph Giovanelli which modifies with respect to 6 Tape Guide/Herman Burstein arm position on -ece d. 10 What's New in Audio Bearing frictian and teMo- 12 Dear Editor nance figures that sate the art 18 Audio ETC/Edward Tatnall Canby form 24 Behind The Scenes/Bert Whyte 58 then-find out an arm is listen - Tape Guide II/Herman Burstein able? 78 Advertising Index 97 Classified Advertising /Only $183 from franchised American Audiorort dealers. EDITOR Eugene Pius III PUBLISHER Jay L. Butler ASSOCIATE EDITOR Edward Tatnall Canby MARKETING DIRECTOR Sanford L. Cahn ASSOCIATE EDITOR Bert Whyte DESIGN Janet Lee ADVERTISING PRODUCTION Lynn Lyons CIRCULATION MANAGER Jean Davis Contributing Editors: Herman Burstein, Martin Clifford, Fred De Van, Leonard Feldman, Martha Sanders Gilmore, Joseph Giovanelli, Richard C. Heyser, Bascom H. King, C.G. McProud, Dan Morgenstern, B.V. Pisha, Donald M. Spoto, George W. Tillett, Jon Tiven. AUDIO (title registered U.S. Pat. Off.) is published monthly by North American Publishing Co., Irvin J. 13orowsky, President; Frank Nemeyer, and Jay L. Butler, Vice Presidents; R. Kenneth Baxter, Vice President/Production; Vic Brody, Promotion Director; Mary Claffey, Circulation Director. RATES-United States only: 1 year for $7.00, 2 years for $12.00, 3 years for $17.00; outside the U.S.: 1 year for $9.00, 2 years for $16.00, and 3 years for $23.00. Printed in U.S.A. at Columbus, Ohio. All rights reserved. Entire contents copyrighted 1976 by North American Publishing Co. Second class postage paid at Philadelphia, Pa. and additional mailing office. Back issues, $2.00 each. World Library Congress number: ISSN 0004-752X. Dewey Decimal number: 621.381 or 778.5. REGIONAL SALES OFFICES: Jay L. Butler, Publisher and Sanford L. Cahn, Marketing Director, 41 East 42nd St., New York, N.Y. 10017, telephone (212) 687-8924. Jay Martin, 2525 West 8th St., Los Angeles, California, 90057, telephone (213) 385-2917. REPRESENTATIVES: Continental Europe: V. B. Sanders, International Publishers Advertising Service, Raadhuisstraat 24, Graft -De -Rip, Holland; telephone 02997-1303. For Benelux and Germany, W.J.M. Saunders, Mgr., Herengracht 365. Amsterdam, Holland, telephone 24.09.08. Japan: Japan Printing News Co., Ltd., No. 13.2 Chome Ginza Higasi, Chuo-ku, Tokyo, telephone 541-5795. AUDIO Editorial and Publishing Offices, 401 No. Broad St., Philadelphia, Pa. 19108 Postmaster: Send Form 3579 to the above address AmericanRadioHistory.Com Blueprint for Flat Frequency Response In the graph below, frequency response was measured using the CBS 100 Test Record, which sweeps from 20-20.000 Hz. The vertical tracking force was set at one gram. Nominal system capacitance was calibrated to he 300 picofarads and the standard 47K ohm resistance was maintained throughout testing. The upper curves represent the frequency response of the right (red) and left (green) channels. The distance between the upper and lower curves represents separation between the charnels in decibels. The inset oscilloscope photo exhibits the cartridge's response to o recorded 1000 Hz square wave indicating its resonant and transient response. Smooth, flat response from 20-20,000 Hz is the most distinct advantage of Empire's 5` new stereo cartridge, the 2000Z. The extreme accuracy of ° zo its reproduction allows you the luxury of fine-tuning your audio system exactly the way you kHz nhir Frepuency In Hi (Cyder per secorw) want it. With the 2000Z, you can exaggerate highs, accentuate lows or leave it flat. You can - make your own`/r adjustments without being tied to the dips and peaks characteristic of most other cartridges. Fora great many people, D \, this alone is reasoneas for ..-' owning the Z. However, we engineered this cartridge to give you more. And it does. Tight channel balance, wide sepa- ration, low tracking force and excellent tracking 1. \/. ability combine to give you total performance. ,, See for yourself in the specifications below, then go to your audio dealer far a demonstration you ![ won't soon forget. The Empire 2000Z. Already your system sounds better. Frequency Response- 20 to 20K Hz ± 1 db using CBS 100 test record Recommended Tracking Force -3/4 to 1'/4 grams (specification given using 1 gram VTF) Separation -20 db 20 Hz to 500 Hz 30db 500 Hzto15KHz 25 db 15K Hz to 20K Hz I.M. Distortion- (RCA 12-5-105) less than 08% .2K Hz to20KHz10 3.54 cm/sec Stylus -0 2 x 0 7 mil diamond Effective Tip Mass -0.2 mg. Compliance-lateral 30X10-6 cm/dyne vertical 30X10-6 cm/dyne Tracking Ability -0.9 grams for 38 cm per sec (a 1000 Hz 0.8 grams for 30 cm per sec lu 400 Hz Channel Balance-within 3/4 db is 1 kHz Tracking Angle- 20° Recommended Load -47 K Ohms Nominal Total System Capacitance required 300 pF Output - 3mv 0 3 5 cm per sec using CBS 100 test record D.C. Resistance- 1100 Ohms Inductance -675 mH Number and Type of Poles- 16 Laminations in a 4 pole configuration Number of Coils- 4(1 pair/channel -hum cancelling) Number of Magnets -3 positioned to eliminate microphonics Type of Cartridge- Fully shielded, moving iron Check No. 11 on Reader Service Card AmericanRadioHistory.Com Audioclinic Joseph Giovanelli Noisy Antenna Rotator (Do NOT use electrolytic types.) If installation properly. (This assumes Q. 1 use an FM -band antenna, with your rotator has only three con- that the company does put the FM shielded 300 -ohm cable and drain nections, use two capacitors; if it has signals on the line.) wire, together with a rotator which is four connections, use three capaci- If you wish to check to see if this di- noisy when only rotating. The noise is tors, etc. rect pickup is really what is taking present during rotation whether or If it happens that you listen to just place, disconnect the tuner from the not the is drain wire connected to the one station, and if this station has re- cable and connect it to a regular an- tuner. The shielded lead-in is new cently begun SCA broadcasts, your tenna, which may be an indoor diple cable and never touches the boom, tuner may not handle this situation for this application. Determine mast or other metal on its way down well. Even if your tuner is equipped whether the stereo is still plauged by to the tuner. It never contacts the line with the appropriate rejection cir- the high-pitched whistle. If it is, feeding power to the rotator. cuits, they may be misaligned. While chances are that there is something Somehow, leakage from the motor you are checking alignment, check within the tuner. must be getting to the tuner's antenna detector and MX circuit alignment. input via the shielded lead-in. I thought at first it might possibly be Steps in Tone Controls coming from the rotator control box Stereo Interference with Q. I own an integrated amplifier in the house, but I moved this unit Cable Reception having twin tone controls for both into another room with no change in Q. My year -old tuner is connected bass and treble which move in the noise level. I have also tried bring- to cable TV. I get a high-pitched tone stepped increments of ±2 dB. Since ing the lead-in drain wire to a cold when my tuner is in the stereo mode. the human ear can only detect a water pipe with no luck. The filter helps a little, but the sound change of volume of 3 dB or greater, What do you think is the cause of is still bad. Reception was fine before I why are more and more manu- my problem and do you have any got cable TV. What is wrong? What facturers coming out with this type of ideas about how I can eliminate the can 1 do?-Charles David, Ft. Wayne, system?-Gregory E. Gill, Fort Wayne, noise?-Stanley L. Alekman, Newark, Ind. Ind. Del. A. If your FM reception deterio- A. Actually, the human ear can or- A. I think that the rotator produces rated immediately upon installing the dinarily hear volume changes of 1 dB the noise and more specifically that cable, I would have to think that your about and under special condi- the noise is produced by the system stereo interference is caused by the tions can detect changes of as little as which indicates the direction in which reception of "direct" signals at the 0.25 dB.