Radio today (Sept 1935-Dec 1936)

SERVICE DATA (From page 46) DRY ELECTROLYTIC CONDENSERS * In discussing the characteristics of dry electrolytic capacitors before the IESM Fall Convention at New York, G-. V. Peck of P. E. Mallory and Co., Inc., said: "The chemical formula of the electrolyte paste used in the finished condenser determines the critical or sparking point. This sparking voltage has been 525, as a general average value on most dry electrolytic condensers until recently. Special electrolytes extending the sparking voltage limit from 525 to 585 volts or higher are now available and in use by some manufacturers of dry electrolytic condensers. "Should sparking occur in dry electrolytic condensers, gas formation is developed which may cause minute explosions internally, due to the mixture of the hydrogen and oxygen gases. This condition is known as 'breakdown.' The best condensers now have separators including a layer of cellophane designed to retard the mixture of the oxygen and hydrogen gases, should any surge ever reach the high sparking voltage point of the new electrolyte. Therefore, these are not necessarily injured by short sparking intervals in these rare cases. "The use of the new electrolyte and cellophane separators gives dry electrolytic condensers new points of superiority that are worthy of consideration by all radio manufacturers." (To next page) Auto radio and ignition tester by Bendix-Dayrad. Complete lab on wheels facilitates trouble shooting. PARTS JOBBERS Save time and money by ordering all yonr radio hardware from one source. "W'e carry in stock all the standard and many speeial items of radio hardware used by manufacturers of receivers — speakers — sound equipment and parts. You will find our prices on bulk and assortments very attractive. MACHINE SCREWS & NUTS TUBULAR RIVETS EYELETS ETC. EYELET LUGS SPADE LUGS SOLDERING LUGS BRASS WASHERS STEEL WASHERS FIBRE WASHERS LOCKWASHERS METAL TAPPING SCREWS SPEAKER MOUNTING SCREWS ESCUTCHEON SCREWS WOOD SCREWS RUBBER GROMMETS Send for Bulletin No. 50 — every item of radio hardware needed by the parts jobber. FEDERAL SALES CO., g s i™. CHICAGO CLOUGH-BRENGLE INSTRUMENTS New 1937 MODELS . . .with FLASH! EXTRA! TIME PAYMENTS ON DEPOSITS! I Service experts! Get many latest type service instruments for only a few dollars down and time payments on the initial low N.U. deposit. 'Remember — deposits are refunded when tube purchases are complete! Get the equipment you need, get it now, the sensational new N.U. way. See your jobber for details! NATIONAL UNION TUBES 1937 Clough-Brengle Signal Generators. Model OMA operates from 110 volts. 50-60 cycle, continuously variable 100 K.C. to 30 M.C. Single and double trace selectivity. Curves for use with output meter or oscillograph: complete with tubes and accessories. 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In SHOP EQUIPMENT items available include stock cabinets coats, display signs, etc. All items absolutely free the National Union Way. Get FULL details. In SERVICE EQUIPMENT items available include tube testers, analyzers, oscillographs, signal generators, modulators, meters, etc., products of such manufacturers as Supreme, Clough-Brengle, Hickok, Triplett, Readrite, Precision, Radio City, Dumont, J.F.D. and others. ABOUT NATIONAL UNION RADIO TUBES National Union manufactures a complete line of radio tubes in glass, metal and G-type. National Union's high quality has made them the outstanding favorite in the radio service profession. All sales policies have been formulated with the idea of making National Union radio tubes the ideal replacement tube for the radio dealer. This has been backed up with a selling program that means real support and help to the wideawake dealer. Dealers and Jobbers handling National Union radio tubes are the leaders in repair parts and services. MODEL OMA 14(' PER DAY $11.40 DOWN DEPOSIT REFUNDED MODEL OC-A 7, PER DAY $5.40 DOWN DEPOSIT REFUNDED Let National Union Help You Write for Information •NATIONAL UNION RADIO CORPORATION 570 Lexington Ave., New York City RT1136 Without obligation please send me more information on ....Free offer on Clough-Brengle Model OMA ; Model 0C-A Free offer on Dealer's Name Address City ■ City State , November, 1936 49