Radio broadcast .. (1922-30)

RADIO BROADCAST ADVERTISER 451 Custom Set Builders Building, as you do, a receiving set for the buyer who insists upon the best in radio, you naturally seek the very latest in de- sign and finest construction in parts—at a price that permits a profit. Just as Dongan has always devoted its entire facilities to the manufacturers of sets, now Dongan recognizes the Custom Set Builder as a distinct factor in the radio industry. Establish a Direct Source on Fine Parts You can avail yourself of special discounts on audio transformers, B-Eliminator trans- formers, chokes and units, A C transform- ers and units, power amplifier transformers, etc.,—all aproved parts designed in one of the world's finest radio parts laboratories and manufactured in one of the most modern and well-equipped plants. For converting D C sets to A C—or for building new sets—write for our Custom Builder's proposition. Your source is di- rect and satisfaction guaranteed. Find out about this at once. You can im- prove the quality of your work and receive added profit. Transformer Headquarters for Set Manufacturers In designing your new set, take advantage of the research work on power transformers developed in the Dongan laboratories. Every feature of approved design available. DONGAN ELECTRIC MFG. CO. 2991-3001 Franklin St., Detroit, Michigan ^TRANSFORMERS of MERIT For FIFTEEN YEARS/,-. Set Builders! Free I9Z8 Radio Guide The hie liarawlk Radio Guide book is used by hundreds of thousands of radio enthusiasts It's the handiest and must reliable radio reference KUide. and a big money-saver. Keep un to date by utilizing Barawik service. 4OOO Radio Bargains 11 slii.u'.-; p-iges replete with reliable informa- tion aboii i tin- newest and ni'^t advanced ideas in A-r radio developments. It will keep you posted «m what's up to d.ite. Lowest Prices on Parts Standard Discounts to Dealers, Set Builders, Agents. It will pay you to get our prices for complete P*rtfl tor the popular circuits featured in RADIO BROADCAST and other magazines. Whenever a new circuit appears for which you want complete parts, write or \\ire us and they'll be on their way to you quickly. We know what parts to send you. Simply give name of circuit and we'll take rare of the rest. We guarantee you a big sav- ing on every order. Send for Free Copy Now! Get our new radio cata- log to-day before you spend another cent on radio. •lust, until the coupon and free copy will be sent you. I>ept. 8IJ4 Chicago, I . S. A. Mail Thin Coupon Now! For Free Copy Name HAMMARLUND "Midline" CONDENSER Soldered brass plates with tie-bars; warpless aluminum alloy frame; ball bearings; bronze clock-spring pigtail; full-floating, removable rotor shaft permits direct tandem coupling to other condensers. Made in all standard capacities and accurately matched. Write for Folder HAMMARLUND MFG. CO. 424-438 W. 33rd St. New-York The Remarkable HAMMARLUND-ROBERTS HiQ Six RECEIVER (Both A. C. and Battery Models) Is Equipped with This Famous Condenser Take a tip from the experts and place your reliance in the Condenser they all respect—the condenser that most of them specify for their newest circuits. The Hammarlund "Midline" embodies the best Condenser thought and engineering skill in the history of radio. // Your Dealer Can't Supply You Write Direct to Us HooUxy ammarlund f F<£C ISIOM PRODUCTS NEW N A TIC N A DRUM DIAL Type F Velvet Vernier Quality and Tuning. Beautiful Hammered Silver Fin- ish. Quick and Easy to Install. List Price $4.00 Type 28 Illuminator 50c NATIONAL COMPANY, Inc., Maiden Radio Convenience Outlets Wire your home for radio. These out- lets fit any standard switch box. Full instructions with each outlet. No. 135—For Loud Speaker Jl.OO No. 137—For Battery Connections 2.50 No. 136—For Aerial and Ground 1.00 With Bakelite Plate* Now furnished with a rich satin brown Bakelite >late. with beautiful markings to harmonize, at 15 cents extra. See Illustration. At Your Dealers Yaxley Mfg. Company Dept. B, 9 So. Clinton St. Chicago, 111. You Can't Control Lightning WHEN lightning goes on a rampage no one can tell just what is going to happen. When it strikes it generally takes the shortest electrical path to ground. When an outdoor antenna is used that path may be through the radio set if the set is not protected by a reliable lightning arrester. The Jewell Lightning Arrester is the best pro- Jewell Lightning Arrester tection available for radio sets against Lightning. As an indication of its reliability, it is listed as Standard by Underwriters' Laboratories, who give it regular periodic tests for performance. It consists essentially of an accurately cali- brated air gap enclosed and sealed within a glazed brown porcelain case suitable equally for indoor or outdoor installation. Radio dealers everywhere carry Jewell Lightning Arresters in stock. Ask your dealer to show you one or write us directly for descriptive information. Jewell Electrical Instrument Company 1650 Walnut Street, Chicago "28 Years Making Good Instruments"