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www.americanradiohistory.com Improved Lacquer Formulation gives STANDARD STYLUS AT 331/3 RPM - 44 - 46 - 48 ., ..s. Disc A -50 Disc B (i) - 52 ` Audiodisc o 54 x %..-- --- - ..... Z - 56 - 58 - 60 MICROGROOVE STYLUS AT 331/3 RPM - 38 - 40 - 42 - 44 _o \ -46 \ -48 \ Disc A d \ > Disc B d - 50 \ - 52 Audiodisc 'ó - 54 1 -\ Z -56 - 58 GEORGE M. SUTHEIM, Audio's Chief 60 Chemist, has developed two major - - improvements in Audiodisc lacquer - 62 5" 6" 7" 8" 9n 10" 11" First was the moisture -resisting Reference Velocity 8 cm per sec. lacquer, perfected in 1948. This Plotted made all Audiodiscs permanently above are actual surface noise measurements made on an resistant to humidity-put an end Audiodisc, and on two other makes of discs. Note particularly the con- to the "summer troubles" that had sistently lower noise level of the Audiodisc. plagued the recording industry This drastic reduction in surface noise is the result of an improved from the very start. This was fol- lacquer formulation - perfected last Fall, after almost 4 years of re- lowed by his development of the search. It has been gradually introduced into production, and since the improved, low-surface -noise lac- first of the year, all Audiodiscs have been of the improved formulation. quer-a significant contribution to Basically, it contains the same time -tested recording quality. ingredients that have been used so successfully for the past Mr. Sutheim, a graduate of the decade. And it offers the same advan- Institute of Technology in Vienna, tages of recording quality, uniformity, smooth cutting, long life and is a chemist of exceptional experi- ease of processing. ence in the field of lacquers and The importance of this improvement will be appreciated by all pro- emulsions. He authored "The In- fessional recordists. troduction to Emulsions" and con- Audiodiscs are manufactured in the U.S.A. under exclusive license from PYRAL, tributed largely to Dr. J. J. Mat- S.A.R.L., Paris. tiello's "Protective and Decorative Coating." He has also written many articles on coatings, films, AUDIO DEVICES, INC. *Reg. U.S. etc., for both French and English Pat. Off. 444 MADISON AVE., NEW YORK 22, N. Y. periodicals. Export Dept.: ROCKE INTERNATIONAL, 13 East 40th St., New York 16, N. Y. See also Audio Devices ad on page 43. www.americanradiohistory.com OSCILLATORS GIVE YOU PRECISE TEST VOLTAGES from '/z cps to 10 ' ANOTHER -hp- SERVICE Person -to -Person Help With Your Measuring Problems Almost anywhere in America, -hp- field representatives can give you personal help with your measuring problems. They have -hp- MODEL 200C complete data on -hp- instruments, their performance, servicing and adaptability. Call the nearest -hp- field representative From 1/2 cps to 10 mc, there's an -hp- resistance tuned oscillator en- whenever, wherever you need help with a gineered to your exact need. Ten precision oscillators in all, including a measuring problem. portable unit that operates from batteries. Each has the familiar -hp- ALBUQUERQUE, NEW MEXICO advantages of high stability, constant output, wide frequency range, low Neely Enterprises 3021/2 W. Central Ave., Albuquerque 3-2245 distortion and no zero set during operation. -hp- precision oscillators BOSTON 16, MASSACHUSETTS Burlingame Associates are used by radio stations, manufacturers, research laboratories and sci- 270 Commonwealth Ave., KEnmore 6-8100 entists throughout the world. CHICAGO 40, ILLINOIS Alfred Crossley & Associates 4501 Ravenswood Ave., UPtown 8-1141 OF CLEVELAND 15, OHIO SPECIFICATIONS -hp- OSCILLATORS M. P. Odell Co. 2536 Euclid Ave., PRospect 1-6171 INSTRUMENT FREQ. RANGE OUTPUT DISTORTION FREQ. RESPONSE PRICE DALLAS 5, TEXAS Earl Lipscomb Associates -hp- 200A 35 cps to 35 kc 1 watt/22.5v Less than 1% ± 1 db to 15 kc 5120.00 4433 Stanford St., LOgan 6-5097 200B 20 cps to 20 he 1 watt/22.5v less than ± 1 db to 15 kc 120.00 DAYTON 2, OHIO -hp- IT. Alfred Crossley & Associates less Than 1%-± -hp- 200C 20 cps to 200 kc 100 mw/ 10. 1 db to 150 kc 150.00 410 W. First St., Michigan 8721 to 20 kc DENVER 3, COLORADO less than 1% ± 1 db throughout Ronald G. Bowen -hp- 200D 7 cps to 70 kc 100 mw/ IOv 175.00 10 cps to 70 kc range 852 Broadway, AComa 5211 DETROIT 5, MICHIGAN ± 1 db, 60 cps -hp- 200H 60 cps to 600 kt 10 mw/ 1 v Less thon 3/. 350.00 S. Sterling Company to 600 kc 13331 Linwood Ave., TOwnsend 8-3130 Less than ± FORT MYERS, FLORIDA -hp- 2001 6 cps to 6 kc 100 mw/ 10v 1% 1 db, 6 to 6000 cps 225.00 above 10 cps Arthur Lynch & Associates P. O. Box 466, Fort Myers 1269M less than ,/2%, ± 1 db throughout -hp- 201 B 20 cps to 20 kc 3 w/42.5v 250.00 HOUSTON 5, TEXAS (I watt output) range Earl Lipscomb Associates less than I /. ± 1 db, 10 to 3919 Riley St., Linden h 202B t cps l0 50 kc 100 mw/ 10vOv 350.00 9303 -p-/= Ito 1000 cps 50,000 cps HIGH POINT, NORTH CAROLINA Bivins & less thon 2% I db, 7 cps Caldwell -hp- 202D 2 cps to 70 tie 100 mw/10v 275.00 Rm. 807, Security Bk. Bldg., High Point 3672 10 cps to70kc to70kc LOS ANGELES 46, CALIFORNIA -hp- 204A ± 1 db throughout 2 cps to 20 kc 2.5 mw/5v Less than 1 % 175.00 Neely Enterprises ((lottery 0'd .l range 7422 Melrose Ave., WHitney 1147 NEW Less than 1% ± 1 db throughout YORK 13, NEW YORK -hp- 650A 10 cps to 10 me 15 mw/3v QS 00 Burlingame Associates 100 cps to 100 kc range 103 Lafayette St., Digby 9-1240 PHILADELPHIA 44, PENN. Burlingame Associates for complete details on any -hp- HEWLETT-PACKARD CO. 422 Coulter St., TEnnessee 9-2006 instrument, write direct to factory SAN FRANCISCO 3, CALIFORNIA 1855-C Page Mill Road Palo Alto, Calif. Neely Enterprises or contact the -hp- technical rep- Export Agents: Frazar & Hansen, Ltd. 954 Howard St., DOuglas 2-2609 San Francisco, U. S. A. ST. LOUIS 3, MISSOURI resentative nearest you. 301 Clay Street Calif., Harris -Hanson Company 208 North 22nd St., MAin 5464 SYRACUSE, NEW YORK Burlingame Associates imp 712 State Tower Bldg., SYracuse 2-0194 TORONTO 2-B, ONTARIO, CANADA Atlas Radio Corporation, Ltd. 560 King St. West, WAverley 4761 instrumen WASHINGTON 9, D. C. Burlingame Associates i ta x SPE t D AND A C. C U II A C Y ' 2017 S Street N. W., DEcatur 8000 AUDIO ENGINEERING JUNE, 1950 1 www.americanradiohistory.com LETTERS "Patents" Column Sir: I was pleased to see the patent note, in the May issue, on H. L. Daniels' voltage Attlee amplifier circuit which I have used on sev- eral occasions. Mr. Daniels is currently my STUDIO MICROPHONES associate, and has provided many variations of this circuit for specific applications. The gain that can be achieved is consider- ably greater than the "high hundreds"; at P.A. PRICES! using a 6SH7 and a 6SF5, a gain of 6000 is readily obtained. Among other things, the circuit is well adapted for use in negative feedback circuits because of its favorable phase -shaft char- acteristic. It can be changed readily to pro- vide push-pull output and the single phase 111 inversion characteristics may be useful in pulse CLOSE TALKING and DISTANT PICK-UP certain techniques. at John W. Hogan, 617 E. 24th St., YOU CAN SHOUT RIGHT INTO IT, or STAND AWAY Minneapolis, Minn. , .. In either case, Quality will be perfectly natural. Outpu' :honge e3uced to a minimum by the Automatic Volume Control effect achieved b) special colstructi3 Identification Sir: Don't you suppose that the increase in so- called "unidentified" requests for manufac- pfRIT turers' literature and information comes from the large group of individuals who 11, provide a good portion of the market for jAYS radio and allied parts and equipment, while the individuals themselves are not even in industry? I mean people like myself who LEADS rt, the veoof is take a great deal of pleasure (incidentally p$1n esPonse spending a sizeable amount of money) in Ìor P12" away, stand much building electronic equipment for self or perfect. ppCl;less friends. Naturally, I have no letter -head to always CCC with use, and postcards are convenient and serve 2 LOWESTdiaphr gm typemike the purpose when I request information. In than any response.below many instances, information I have received frequency equal ,% from manufacturers has resulted in the pur- DISTORTION;withoutr chase of equipment or parts. 3 LESS peaksove However, there are two outfits which will RESPONSE cps. never get a nickel of my money simply be- 4 fLp Rrange of cause the first ignored my request for price frequency db)1 pO00 effeicct re- * (_62 control lists of their components and the second construction. fused to send me the most commonplace in- QUÌPu 1 volosP ecial 5 with formation. Of course, I shall not recommend achieved their products to my friends, either. ACT and RUGGED 6 COMP NGES John Gera, etc. 6436 S. Hermitage, w Hd, 7 UNpffECtE itio Chicago 36, Ill. in climatic Sir: In mild disapproval of your May editorial, I assume that your advertisers use .L be- cause they want to reach .i's readers. In planning advertising expenditures, com- AMPERITE C 4R )IC ID panies presumably consider that a large DYNAMIC MICROFIOVE section of your readers are interested in audio as individuals, not in a professional Models PGH.PGL .._ Lis $32.00 way. It would seem reasonable to suggest that those who intend their advertising only for the strictly industrial and professional Amperite "Kontak" Mikes fields should specifically so state.
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