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AUDIO ENGINEERING OCTOBER, 1948 I Linear Standard Units

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AUDIO ENGINEERING OCTOBER, 1948 I Linear Standard Units aY'si' y.. ... t.. AA A 1 _ 1iÌTUÌcß " PRICES AND AUDIODISCS Sictt,men.t On ai[h Phic2 Policy As of September 1st, aluminum prices ccre Fortunately, our patented, precision- machine again increased. This means higher cost for the process -now used for over a decade and con- principal raw material used in the manufacture tinuously improved -gives a more consistent of AUDIODISCS. In fact, the cost of the yield of high quality discs than any method of aluminum base has always been the main item production now used. And we have tested every in the cost of production. Thus, any increase in other process in use. aluminum prices is of major importance. But beyond the cost of raw materials and So our position with respect to the present labor there is a basic factor which determines the increase in aluminum prices is this: cost of manufacturing professional recording 1. We are not increasing prices of AUDIODISCS. discs. This factor is the extent to which the particular process of manufacture enables the producer to turn out a large proportion of first 2: We shall make every effort to absorb this new quality discs. There are several methods of aluminum price raise and thus continue our production used. None of these will give anything prices at the present level. Our calculations like a 100% yield. It is, however, obvious that indicate that with some improved efficiency, as the percentage of yield increases there is a now under way, and continued large volume resulting drop in the average cost of aluminum, production, we shall he successful in this hold - lacquer and labor. the -price effort. Audiodiscs are manufactured in the U.S.A. under exclusive license from PYRAL, S.A.R.L., Paris. Audio Devices, Inc., 444 Madison Ave., N.Y. C. EXPORT DEPT: ROCKE INTERNATIONAL, 13 EAST 40Th STREET, NEW YORK 16, N. Y. Link FM -With Sylvania Loch -Ins Covers New Jersey For Its State Police Radio System Drivers of both emergency trucks and patrol cars con maintain two -way communication Automotive equipment of the New Jersey State Police includes vehicles with fixed stations. always on the alert to deal with every emergency. Fleet is spearheaded by 180 patrol cars of the department in addition to 42 patrol cars of the State Motor Vehicle Department which is served by the State Police. These vehicles are constantly in touch with fixed FM stations located at 26 strategic points throughout the state. In addition, emergency trucks carry complete radio equipment equivalent to that of a fixed station! Link Radio Corporation, manufacturer of the communications equip- ment, makes extensive use of Sylvania Lock -In tubes to assure unfailing efficiency of this statewide network. Lock -In tubes stay put through vibration and jarring. They have few welded joints ...no soldered ones. Elements cannot it arp or weave ...connections are short and direct. Top Radio equipment in emergency trucks dupli- location of getter reduces losses ...separation of getter material from cotes the set-up used in fixed transmitting stations. leads cuts down leakage. See Sylvania Distributors -or write RadioTube Division,Emporium,Pa. The superior mechanical and elec- trical features of Sylvania Electric's famous Lock.ln tube make it the SYLVA ideal choice for equipment on NIA the road, in the air, on the rails, marine radar, FM and television. ELEC11R1 C MAKERS OF RADIO TUBES; CATHODE RAY TUBES; ELECTRONIC DEVICES; FLUORESCENT LAMPS, FIXTURES, WIRING DEVICES; ELECTRIC LIGHT BULBS AUDIO ENGINEERING OCTOBER, 1948 I Linear Standard Units... THE ULTIMATE IN QUALITY. .. UTC Linear Standard Audio Transformers represent the closest approach to the ideal component from the standpoint of uniform frequency re- sponse, low wave form distortion, high efficiency, thorough shielding and utmost dependability. UTC Linear Standard Transformers feature ... True Hum Balancing Coil maxi. Structure ... Semi -Toroidal Multiple Coil Structure .. mum neutralisation of stray fields. minimum distributed capacity and leakage re Balanced Variable Impedance Line ... per. oc tonte. mils highest fidelity on very top of a universal nit . no line reflections or transverse coupling. Precision Winding . accuracy of winding Reversible Mounting ... permits above chassis .1%, perfect balance of inductance and capacity; or sub-chassis wiring. exact impedance reflection. Alloy Shields ... maximum shielding from in- High Fidelity . UTC Linear Standard Trans - ductive pickup. For e the only audio units with a guaron- Hiperm -Alloy .. a stable, high permeability ± teed euniform response of 1 DB from 20- 20,000 nickel -iron core malarial. cycles. TYPICAL LS LOW LEVEL TRANSFORMERS Relative Max. hum- Unbal- Primary Secondary +1 db Max. pickup anted DC List Type N6, Application Impedance Impedance from Level reduction in prim'y Prlee LS -10 Low impedance mike, 50, 125. 200, 60.000 ohms In 20-20,000 +15 DB -74 DB 5 MA 525.00 pickup. or multiple line 250. 333, 500/ Isso sections 08 to grid 600 ohms LB -10X As Above As above 50,000 ohms 20-20,000 +14 DB -92 DB 5 MA 32.00 1.5.12 Low Impedance mike. 50. 125, 200, 120.000 ohms 20.20,000 +15 DB -74 DB 5 51A 28.00 pickup. or multiple line 250, 333. 500/ overall. In two LI-50X to push pull grids 000 ohms sections LB12X As above As above 80,000 ohms 20-20,000 +14 DB -92 DB 5 MA 35.00 overall. in two sections LS-28 Bridging line to single or 5.000 ohms 60.000 ohms in 15- 20.000 +20 DB -74 DB 0 MA 25.00 push pull grids two sections LS-19 Single to 1 plate push pul 15,000 ohms - 95,000 ohms; 30- 20.000 +17 DB -50 DB 0 MA 24.00 grids Ifke 2A3. 614. 300A. 1.25:1 each side Split secondary L$x2l. Kingle plate 00 to push pull 15,000 ohms 135,000 ohms; 20-20,000 +14 DB --74 DB 0 MA 24.00 Vida. Split primary and tuns rallo secondary 3:1 overall LS -22 Push pull plates to push 30,000 ohms 80.000 ohms; 20-20,000 -h26 DB -50 DB .25 MA 31.00 LS-i2 pull grids. Spilt primary plate to plate turn ratio and secondary 1.6:1 overall low Lß30 Mixing. impedance 50, 125. 200, 50, 125. 200, 250, 20-20.000 +17 DB -74 DB 5 MA 25.00 mike. pickup. or multi- 250, 333, 500/ 333, 500 /600 ohms ple line to multiple line 600 ohms LS -30X above As As above As above 20- 20.000 +15 DB -92 DB 3 MA 32.00 LS -27 Single to plate multiple 15.000 ohms 50, 125. 200, 250. 30. 12,000 +20 DB -74 DB 8 MA 24.00 line 333. 500 /600 ohms cycles LB-50 Single plate to multiple 15,000 ohms 50, 125. 200. 250. 20- 20,000 +17 DB -74 DB 0 MA 24.00 line 333, 500/600 ohms LB -S1 Push pull low level 30.000 ohms 15111i1111 L plates 50, 125. 200. 250, 20.20.000 +20 DB -74 DB 1 MA 24.00 to multiple line plate to plate 333. 500 /600 ohms -141 LS Three sets of balanced 500/600 ohms 500,000 ohms 30- 12,000 +10 DB -74 DB 0 MA 28.00 LS 50 windings for hybrid ser- vice. cenlertapped 11111 11 .R11.111011111111REINIMIPPIIMM TYPICAL LS OUTPUT TRANSFORMERS Type Primary will match Primary Secondary I db Max. List Ne. folioed no typical tubes Impedance Impedance from Level Price '. Lß52 l'uah pull 245. 250, GVG, 42 or 8.000 uluse 500, 333, 250. 25- 20,000 15 watts $28.00 2A5 A prune 200, 125. 50. 30, 20. 15, 10, 7.5, 5. 2.5. 1.2 LS-55 LSSS Push pull 2A3's. 6Á50's, 300A's, 5.000 ohms plate 500. 333. 250. 25- 20.000 20 watts 28.00 275A's, 6A3's. 61.6's to plate and 200, 125, 50. 30, 3,000 ohms plate 20. 15, 10. 7.5, to plate 5. 2.5. 1.2 LB -57 Sane as love 5.000 ohms plate 30, 20, 15, 10, 25- 20.000 20 watts 20.00 to plate and 7.5. 5, 2.5. 1.2 raEatlEMCy 3,000 ohms plate to plate LS-511 Pusi, pull parallel 2A3's. 0A50 's, 2,500 ohms plate 500, 333. 250. 25.20.000 40 watts 50.00 300A's, 6A3's to plate and 200. 125. 50, 30, 1.500 ohms plate 20, 15. 10. 7.5, to plate 5. 2.5, 1.2 wrc for our Catalog PS -4108 LSOLI Push pull 6L6 's self bias 0,000 ohms plate 500, 333, 250. 25.20.000 30 watts 42.00 to plalo 200. 125, 50. 30. 20, 15, 10, 7.5, 5. 2.5, 1.2 150 VARICK STREET NEW YORK 13, N. Y. EXPORT DIVISION: 13 EAST 40th STREET. NEW YORK 16. N. Y.. CABLES: "ARLAB" John H. Potts, Editor Sanford R. Cowan, Publisher C. G. McProud, Managing Editor S. L. Cahn, Adv. Director Lawrence LeKashman, Asst. Editor H. N. Relies, Adv. Mgr. 'AUDI Louisa B. Dresser, Edit. Prod. Mgr, D. Reissman, Circ. Mgr. Editorial Advisory Board Representatives EGINEERIIVG Howard A. Chinn James C. Galloway 13, John D. Colvin 816 W. 5th St., Los Angeles Catit. C. J. LeBel Dale International Publications, Ltd. 105 Bolsover St. J. P. Maxfield London W. I, England George M. Nixon Successor to RADIO Harris & Floyd Winston Wells 297 Swanston St., Melbourne I, Australia S. Young White C. Victoria, Established 1917 CONTENTS OCTOBER, 1948 Vol. 32, No. IO Editor's Report l' Letters 8 Magnetic Tape Recorder of Broadcast Quality -Harold Lindsay and Myron Stolaroff 13 Intermodulation and Harmonic Distortion Measurements -I.
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