Radio Digest (Oct 1923-July 1924)

^■1 RADIO D'l G E ST — Illustrated March 29, 192U R.D.-118 ULTRA AUDION CIRCUIT CUTOUT SW. .00025 .001 -5"e2iTo45V — Illlllllll 1 1 R.D.-118 + THE hook-up shown in the diagram has been tested by myself and some of my skeptical friends. To prove the merits of my set I invited two friends to listen in that evening. They claimed 1 would not get anything but static and local station. Much to my friends' wonder, I received the following stations from until 11:00 o'clock: WJAZ, WOAW, P1VX. WEAF, YVDAP. WRC, WEBA, WBAP, WFAA, KSD. TOT, WDAP, and WGAT. This hook-up is based on the Colpitts or I'ltra-Aiulion circuits. I used a cut out out or cut in the fixed condenser In the antenna circuit, and a UV-199 tube with flash-light cells for A battery. The B batteries are of the small size type, adapted to portability. One .00025 mfd. condenser is used with a variometer and another one is connected across the antenna and ground. The fixed condenser is .001 mfd. and is used to help stabilize the circuit. A variometer can be used in the plate circuit if desired. At times it will work without a ground when the fixed condenser is cut out. If trouble is encountered with capacity effects, connect the rotary plates of the condenser to the ground. If this does not help, shielding is necessary. — Harold Miller, 15 National Drive, Newark, Ohio. Efficiency in Sets Cheap parts with poor electrical qualities and sloppy workmanship which add resistance and cause leaks in the circuit are responsible for virtually every failure in Radio. An amateur should exercise every care and effort in hooking up a set so as to make a good job of it. Use good parts, arrange them neatly and efficiently Turney's Famous SPIDER WEB (Trade Mark) Plex Tuner Three genuine Turney Spider Web Coils with two dial vernier tuning control. At your dealer $6.00 or direct for M.O. Stand 25c extra A Wonder for Selectivity and Distance An ideal tuner for your SUPERHETERODYNE. (Write for this circuit, it is free.) Packed with four hookups, 1 crystal and 3 for tube. Inexpensive circuits that have made marvelous records. TRISTAN SALES CORPORATION, DepL C Sole National Distributors 1 UNION SQUARE NEW YORK REINARTZ The Coil That Talked With France Only the genuine coil bears the signature of JOHN L. REINARTZ ALL OTHERS ARE IMITATIONS and are NOT ADAPTED to his new circuit. Reinartz's latest hookup (never sold) with instruction sheet free in every box. AT YOUR DEALER $2.50 Or Direct for Money Order TRISTAN SALES CORP., Dept. C National Distributors 1 Union Square, NEW YORK CITY in the cabinet, keep all wires well separated and exercise great care in soldering connections. If these rules are followed, success will be almost certain. Don't handle vacuum tubes roughly, or elements may be injured. Instruments of Excellence Malone Lemmon Control-o-meters the best wave trap for eliminating interfering stations and for greater selectivity $12.50 Langbein & Kaufman Variocouplers and Variometers 7.00 Malone-Lemmon Condensers 7.50 Ballantine Tuned Radio Frequency Transformers . . . 9.60 Units 15.00 Curcoids The Supreme Inductance by Means of Precision Coupling Coils. . 7.50 PARTS FOR ACMEDYNE NOW IN STOCK Amperites $1.10 Meyers Hi-Mu Tubes 4.35 Radio and Mechanical Trading Corp. 23 Warren St. New York City 35.00 30.00 1.75 3.00 4.75 5.50 7.00 18.00 18.50 3.00 4.00 12.50 5.00 1.00 1.25 1.25 lo.oo 6.00 .60 .70 ff.50 7. nil B.-3 Magnavox, new type $31.50 Trinity Loud Speaker, new type 25.00 22y2 V. B Battery, small 75 22% V. B Batteries, large 1.45 45 V. B Batten', medium 2.00 45 V. B Battery, larnc 2.90 WesttoehouBe Storage B Batteries 6.39 Westlngbsuae Bectigon, A. 0 14.63 Homcharger Gold Seal." A. C 14.95 Acmi Audio ami Radio Freq. Trans.... 3.95 Thordarson Trans., low $3.25: high 3.75 Como Push and Pull Transformers 10.50 Eria Audio and Radio Freq. Trans.... 4.20 0 olim Amsco Rheostat 75 6 ohm with dial Amsco Rheostat 85 20 ohm Amsco Rheostat 85 13 pi. Amsco Vernier Condensers 2.65 2T; i»l. Amsco Vernier Condensers 3.50 43 pi. Vernier Condensers 4.00 £1 Radio Soldering Iron with Paste and Solder free 1.90 Small Hydrometers 35 Brunei French Phones, 4000 ohms 6.50 Brandes Superior Phones, genuine 4.75 S. P. S. T. Mar-eo Knife Switches 55 S. P. I). T. Mar-eo Knife Swltchei ... .60 Pioneer all mid. Bakelite Variometers.. 4.85 Pioneer all mid. Bakelite Variocouplers 4.95 SUk Covered Folding Loop 4.50 W" REMITTANCES MUST INCLUDE POSTAGE SEND FOR OUR FREE MONTHLY . 'UCE LIST DEPT. H. D. The Reader's View Radio Sells Songs and Shows Much lias been said and written about Radio broadcasting being harmful to the sale of music, the attendance at places of amusement, etc., yet I feel sure I could convince the most doubtful to the contrary through my own experience. Being the possessor of a receiving set several years before music was broadcast, and aiming to have the most powerful set in the community ever since, I have come in contact with many persons, of whom some would come over just to listen in and others intended buyers of Radio sets. MARVEL RADIO C9 The New Marvel BEACON CRYSTAL DETECTOR The Beacon Will — When Others Fail Gold Point Replaceable Crystal Vernier Adjustment Especially adapted g #4 for reflex circuits. Will improve the ** ™ reception off any crystal set. Every Beacon Is thoroughly tested in our laboratory and fully guaranteed. The gold point and vernier adjustment gives it positive contact at all times. Replaceable crystal and glass cover makes the Beacon the most efficient and economical crystal detector on the market Price, $1.50 — For Sale by All Reliable Dealers JOBBERS— DEALERS: This is a fast seller. Write for discounts. Midwest Electric Specialty Co. 106 North La Salle Street, CHICAGO, ILL. ELECTRAD VARIOHM Doubles Your Distance Eliminates Circuit Noises The Variohm enables you to get exactly the correct grid resistance for your tubes and set. Any resistance from *4 to 30 Megohms by simply turning the knob. Once set, stays permanently. Built like a watch, yet never gets out ot order. Moisture proof and non-microphonic. Can be used with anystandard fixed condenser. Price, 75c; mounted, $1.00. At your dealers, or direct. Satisfaction guaranteed or money back. ELECTRAD, Inc. 428 Broadway, New York. N. Y. Dept. L y0/^ This Book Sells Like Hotcakes! VAN'S Radio Record Book BROADCASTING STATIONS AND VACUUM TUBE CHART A Radio Book That Sells at Sight! USED by all Up-to-date Listeners everywhere. LIST of Broadcasting Stations. SPACE for DIAL SETTINGS. Make a record of it so that you can go back to any station you have heard. CALL LETTERS of each Broadcasting Station. Wave Length. Frequency Key. Distance. Power in Watts, etc. ALL AT A GLANCE ! VACUUM TUBE CHART How to Select and Use Them The different RADIO TUBES illustrated. Tells you what TUBES to use to get the BEST out of your receiving set. Tells yon the power and current required and consumed by the different tubes from Laboratory Tests. What TUBES workbest with a DRY CELL or STORAGE batteries, or on both. A storehouse of information. If you SEE this book, you will want one. That's HOW GOOD IT IS! Price 50 Cents At Your Dealer or Sent Prepaid on Receipt of Prict. Remit by Money Order (No Stamps). VAN PUBLISHING CO. HO Nassau Street, New York The expression I have heard most Is. "My, that was a pretty piece of music — I must get that," meaning, of course, a record for their phonograph or music^ for their piano. I know lots of them noiv who own Radio sets who keep a record of the name of any pleasing piece of music they hear via the airway, and give copies of that list to their friends, telling them to get that good and late music — and they do get it. When soldering battery connections, always use pure lead, as tin composition will corrode. Burned Out or Broken RADIO TUBES REPAIRED All Tubes Guaranteed to Work Like New Mail Orders Given Prompt Attention 24 HOUR SERVICE— All Tubes returned PJ>. C.O.D. RADIOTRONS WD-11 or 12 UV-2W UV-201 UV-202 UV-201A UV-199 DV-I or 2 CUNNINGHAMS C-ll or 12 COM C-301 C-302 C-301A C-299 DV-< or SA RADIO TUBE CORP. 76 Halsey St. Newark, N. J. OR SEND TO NEAREST "RADIO TUBES" 39 West Adams St. Ckicags, 111. REPAIR BRANCH GLOBE ELECTRIC CO. 609 Cham, of Com. Bldg. Pittsburgh, Pa. RADIO TUBE SPECIALISTS 137 Market St. Phi la.. Pa. WELLST0N RADIO CO. 1479 Hodiamont Ave. St. Louis. Mo. RIDENOUR, SEAVER St KENDIG Caxton Bldg., Cleveland, Ohio Improve Your Set WITH Union Radio Tip Jacks (Patent Pending) No more trouble with binding posts, no more noises from poor connections. You should use Union Radio Tip Jacks for all antenna, ground and battery connections and contacts. They give you quickly made, positive connections, and improve the appearance of your set. Extensively used by leading set manufacturers. Two sizes for all mountings. STANDARD TYPE A for panels up to J4" thick. SPECIAL TYPE B for panels, cabinet walls and partitions from ft" to thick. Will firmly grip all wires from No. 11 to No. 24 B & S gauge and can be reamed to hold antenna wire. No parts to chip, lose or deteriorate. All parts heavily nickel plated. Price in U. S., 25c; in Canada, 35c a pair. Other Union Radio Parts Dial adjusters for minute variations in capacities of variable condensers. Price, 60c Tube sockets of molded condensite highly polished. Phosphor Bronze contact springs. Reinforced bayonet slot prevents breakage. Accommodates all standard tubes. Price, 70c. Should your favorite Radio Store not carry Union Radio Tip Jacks and Guarantee Parts send your order direct to us; also write for your copy of The Union Radio Catalog "H." RETAILERS AND WHOLESALERS Samples of our guaranteed reasonahtx? priced "Qumlitf Product*" sent on request. Our terms and trade discounts arc liberal. Write for our prmpaaition. Abo write for your copy of the Union Radio Catalog *"H ** UNION-RADIO-CORPO RATION 200*MTPLEASANT-AVENUE,-K;\NAv\ \ .1 NEW» YORK OFFICE — 1 16-\\"E5T*3;=-STRSEt