Radio Broadcast (May 1927-Apr 1928)

258 RADIO BROADCAST ADVERTISER HOWARD 1928, A. C. 6 Aluminum shielded all electric; R. C. A. or Cunningham tubes. 425 volt amplifier. No batteries, Marvelous tone, volume, distance and selectivity. Complete $311.50. &og£ i£>tarkhjeatt)er Wholesale (Electric aaatuo Coo!« anb Supplies 3Room 506 19 &. OTellg street, Chicago, 3)11. EL KAY SUPPRESSOR Controls the Squeals Fits grid circuit of any tuned R. F. set. Stops tendency to "boi! over" and squeal. 75c each; $1 mounted. Satisfaction or money back. Describe set when ordering. Langtein Kaufman Radio Co., Dept. B, 62 Franklin St. NewiHaven > Conn. To Dealers: The new 136-page Colored and Illustrated 1028 Hamilton-Carr Wholesale Catalog is ready. Thousands of amazing values in kits, packs, nationally advertised accessories and parts. Features master-built, singlecontrol six, seven and eight tube sets. Battery or all*electricoperation. Beautiful consoles. Complete line of chasis. Full showing of "A" and "B" Eliminators, kits and parts. All merchandise guaranteed by pioneers in radio business. Immediate service. Write us today on your business letter-head for this wonderful catalog. The greatest assortment of merchandise ever shown at the lowest prices. HAMILTON-CARR RADIO CORP. 711 West Lake St. Dep't. 376 Chicago, III. j What Kit Shall I Buy? (Continued) 22 1 . LR4 Ultradvne — Nine-tube super-heterodyne; one stage of tuned radio frequency, one modulator, one oscillator, three intermediate-frequency stages, detector, and two transformer-coupled audio stages. 222. Greiff Multiplex — Four tubes (equivalent to six tubes); one stage of tuned radio frequency, one stage of transformer-coupled radio frequency, crystal detector, two stages of transformer-coupled audio, and one stage of impedance-coupled audio. Two controls. Price complete parts, S50.00. 223. Phonograph Amplifier — A five-tube amplifier device having an oscillator, a dectector, one stage of transformer-coupled audio, and two stages of impedance-coupled audio. The phonograph signal is made to modulate the oscillator in much the same manner as an incoming signal from an antenna. 224. Browning-Drake — Five tubes; one stage tuned radio frequency (with special neutralization system), regenerative detector (tickler control), three stages of audio (special combination of resistance and impedance-coupled audio). Two controls. 225. Aero Short-Wave Transmitting Kit consists of interchangeable coils to be used in tuned-plate tuned grid circuit. Kits of coils, two choke coils, and mountings, can be secured for 20-40 meter band, 40-80 meter band, or 90-180 meter band for $1 2.00 USE THIS COUPON FOR KITS Radio Broadcast Service Department Garden City, New York. Please send me information about the following kits indicated by number: Name Address ' (Number) (Street) "'(City)'" (State) ORDER BY NUMBER ONLY. This coupon must accompany each order. RB1-28 A New R. F. System THE De Forest Company, which from the beginning has been one of the principal opponents of the rapidly augmenting position of the Radio Corporation in the radio patent field, recently announced that Dr. George A. Somersalo, a Finnish physicist, has developed a new system of radio-frequency amplification which does not conflict with the Alexanderson tuned radio-frequency patent. This system depends upon the use of a filter ahead . of the first radio stage, the radio-frequency amplifier being untuned. The Alexanderson patent, however, is not the only one possessed by the Radio Corporation of America and a great battle of wits lies ahead for those who want to do entirely without Radio Corporation licenses. No one who has had extensive contact with the American inventor, however, would venture to predict that it cannot be done. I USE THIS COUPON FOR COMPLETE SETS I Radio Broadcast Service Department | Radio Broadcast, Garden City, New York. I Please send me information about the following manu | factured receivers indicated by number; Name Address (Number) (Street) (City) ' ' ' (State) ORDER BY NUMBER ONLY This coupon must accompany each order. RB 1-28 RADIO DEALERS Send for our catalog illustrating the products of over 100 radio manufacturers. WHOLESALE ONLY! F. D. PITTS COMPANY 219-223 Columbus Ave. BOSTON, MASS., U. S. A. Established 1919 "that won't work on a B-ELIMINATOR" Your Next "B" Had Better Be the NATIONAL BETTERS Type 7180 NATIONAL CO., Inc. W. A. Ready, Pres. Maiden Mass. TheUniqueRADlO THRILL of receivin Australia and Japan the same night was expe rienced September 11, 1927, by K. G. Ormis ton. on a hom<--l»ii,lt Magnaformer 9-8, Nov. , r.r H-j;, H ' ' An.i.T .... Ens ll< iMK BUILT Magn dormer Jt-8 pulled in 1 New Zealand. 2 Australian, 2 Japanese and 61 long distance Western Hemisphere stations from the Atlantic to Pacific-*;, niiOt.. 9,iiU0 miles on loud speaker vith a >vorld of volume. On his home-built Magnaformer 98 J. M. Douglas cut eleanlv (iiromrh the blanketing barrage of the numerous, powerful local Chicago stations and pulled in 32 out-of-town stations witliout interference. Only a Magnaformer 9-8 can give you such performance. It is witt.out question the greatest Radio Set in the world. It brings *hem in not onlv from Coast to ('oast hut Irom Continent to Continent. It is NEW and decidedly IUFFEKENT. Uses 9 tubes. Includes all latest scientific developments. Performance truly phenomenal. Has registered a profound impression on Engineers and Technical Editors everywhere. Being constantly featured in all radio magazines. It-; fame is sweeping the earth. Amazing fidelity of tone. Even brings out the full, round, boomboom of tile liass drum entirely absent from other receivers. Easily and quickly built at home or in any radio shop. Simple and easy to operate. Absolutely A mazing Perfection of Tone Quality. Very highest class Super Receiver. Designed for those who want only the very best. The outstanding choice of Custom Set Builders. Full scientific explanation of Magnaformer Transformers, the cause of this set's remarkable performance and complete home -building inst met ion sheet. 28 in. x 34 in., printed both sides, full of illustrations and minutely detailed wiring diagrams and photographs sent FREE, immediately. Mail your name and complete address at once. Now Radiart Laboratories, 1005 Association Bfdg., Chicago. III.