Radio Broadcast (May 1927-Apr 1928)

254 RADIO BROADCAST ADVERTISER While your neighbors ave cussirithe static Your set, with its Dubilier Light-Socket Aerial, is bringing the programs in smooth as silk. It's a fact! This little aerial, which you simply attach to the set and plug into the nearest light socket, reduces both static and interference to a marked degree. It uses no current whatever and absolutely eliminates the lightning hazard. Costs you nothing to prove it, for the Dubilier Aerial is sold by all good dealers on a 5-day, money-back basis. If your dealer can't supply you, write direct to us. Price, $1.50. Dubilier LIGHT SOCKET AERIAL If you're planning to build a power-unit make sure 'that the condenser blocks you intend to use are built to withstand long hours of heavyduty service. Dubilier blocks have an excessive high faotor of safety and a "life" that makes them by far the most economical to buy. Full instructions enclosed with each block unit. DUBILIER CONDENSER CORP. 4377 Bronx Blvd. New York, N. Y. Dubilier CONDENSERS 77. Tubes — A booklet for the beginner who is interested in vacuum tubes. A non-technical consideration of the various elements in the tube as well as their position in the receiver. Cleartron Vacuum Tube Company. 87. Tube Tester — A complete description of how to build and how to operate a tube tester. Burton-Rogers Company. 91. Vacuum Tubes — A booklet giving the characteristics and uses of various types of tubes. This booklet may be obtained in English, Spanish, or Portuguese. DeForest Radio Company. 92. Resistors for A. C. Operated Receivers — A booklet giving circuit suggestions for building a. c operated receivers, together with a diagram of the circuit used with the new 400-milliampere rectifier tube. Carter Radio Company. 97. High-Resistance Voltmeters— A folder giving information on how to use a high-resistance voltmeter, special consideration being given the voltage measurement of socket-power devices. Westinghouse Electric & Manufacturing Company. 102. Radio Power Bulletins — Circuit diagrams, theory constants, and trouble-shooting hints for units employing the BH or B rectifier tubes. Raytheon Manufacturing Company. 103. A. C. Tubes — The design and operating characteristics of a new a. c. tube. Five circuit diagrams show how to convert well-known circuits. Sovereign Electric & Manufacturing Company. 38. Log Sheet — A list of broadcasting stations with columns for marking down dial settings. U. S. L. Radio, Incorporated. 41. Baby Radio Transmitter of 9XH-9EK — Description and circuit diagrams of dry-cell operated transmitter. Burgess Battery Company. 42. Arctic Radio Equipment — Description and circuit details of short-wave receiver and transmitter used in Arctic exploration. Burgess Battery Company. 43. Short-Wave Receiver of 9XH-9EK — Complete directions for assembly and operation of the receiver. Burgess Battery Company. 58. How to Select a Receiver — A commonsense booklet describing what a radio set is, and what you should expect from it, in language that any one can understand. Day-Fan Electric Company. 67. Weather for Radio — A very interesting booklet on the relationship between weather and radio reception, with maps and data on forecasting the probable results Taylor Instrument Companies. USE THIS BOOKLET COUPON Radio Broadcast Service Department Radio Broadcast, Garden City, N. Y. Please send me (at no expense) the following booklets indicated by numbers in the published list above: Name : Address (Name) (Street) (City) (State) ORDER BY NUMBER ONLY This coupon must accompany every request. RB 1-28 73. Radio Simplified — A non-technical booklet giving pertinent data on various radio subjects. Of especial interest to the beginner and set owner. Crosley Radio Corporation. 74. The Experimenter — A monthly publication which gives technical facts, valuable tabL'S, and pertinent information on various radio subjects. Interesting to the experimenter and to the technical radio man. General Radio Company. 76. Radio Instruments — A description of various meters used in radio and .-.ectrical circuits together with a short discussion of their uses. Jewell Electrical Instrument Company. 78. Electrical Troubles — A pamphlet describing the use of electrical testing instruments in automotive work combined with a description of the cadmium test for storage batteries. Of interest to the owner of storage batteries. Burton Rogers Company. 95. Resistance Data — Successive bulletins regarding the use of resistors in various parts of the radio circuit. International Resistance Company. 96. Vacuum Tube Testing — A booklet giving pertinent data on how to test vacuum tubes with special reference to a tube testing unit. Jewell Electrical Instrument Company. 98. Copper Shielding — A booklet giving information on the use of shielding in radio receivers, with notes and diagrams showing how it may be applied practically. Of special interest to the home constructor. The Copper and Bras; Research Association. 99. Radio Convenience Outlets — A folder giving diagrams and specifications for installing loud speakers in various locations at some distance from the receiving set. Yaxley Manufacturing Company. 105. Coils — Excellent data on a radio-frequency coil with constructional information on six broadcast receivers, two short-wave receivers, and several transmitting circuits Aero Products Company. 106. Audio Transformer — Data on a high-quality audio transformer with circuits for use. Also useful data on detector and amplifier tubes. Sangamo Electric Company. 107. Vacuum Tubes — Data on vacuum tubes with facts about each. Ken-Radio Company. 108. Vacuum Tubes — Operating characteristics of an a.c. tube with curves and circuit diagram for connection in converting various receivers to a.c. operation with a four-prong a.c. tube. Arcturus Radio Company,. 109. Receiver Construction— Constructional data on a six-tube receiver using restricted field coils. Bodine Electric Company. QUALITY PRODUCTS nos! Now That Everybody Demands Electrically-Operated Radii Dongan is in Production on All Types of A. C. Tube Transformers Six months ago Dongan engineers were preparing for the day when the industry unanimously accepted complete electrical operation of receiving sets. For every new tube brought forth, Dongan designed the proper transformer or power unit. To-day you can secure from the production line Transformers and Power Supply Units for whatever type of AC or ABC Tube you have chosen. For Dongan has been in production on approved types for many months. Here is the Newest No. 6515 Transformer for use with 4 UX 228, 1 UY 227 A C Tubes and 1 UX 171 Tube. Together with a B Eliminator, this new transformer will convert old type set into an efficiently operating A C set. $4.75 List This is one of 14 types ranging in price from $3.50 to $8.00 for use with the new types of A C Tubes. Manufacturers are invited to write for any kind of information from our engineering department. Fans — order from your dealer or send check or money order to factory direct. No. 5553 ABC POWER UNIT for UX 226, UY 227, UX 171, and UX 280 Tubes $22 List DONGAN ELECTRIC MFG. CO. 2991-3001 Franklin St., Detroit, Michigan