Radio Broadcast (May 1929-Apr 1930)

RADIO BROADCAST. IN THE RADIO MARKETPLACE Specialty Co., of Dallas, Texas, C. E. Hamlin Sales Co., of Jackson, Mich., National Auto Supply Company, of Independence, Iowa, Michigan Automotive Supply Co., of Detroit, Mich., Radio Supply Co., of Tulsa, Oklahoma, The Royal Furniture Co., of Baltimore, Md., Southern Ohio Badio Corp., of Cincinnati, Ohio, and the Union Tire & Supply Co., of Burlington, Iowa. It is also announced that the distributorship for Rhode Island has been given to the Plymouth Electric Company, New Haven, Conn., of which R. J. Mailhouse is the head. The company will open offices in Providence. Campbell & Penfield have completed arrangements with the Federal Radio Corporation of Buffalo, whereby they have become distributors in the Detroit area for Federal Orthosonic receiving sets. Showrooms and warehouse have been opened in Convention Hall at 3481 Woodward Ave. where the new Federal "M" and "L" models are now on display. The State Badio Distributing Company, with headquarters in Newark, N. J., will act as wholesaler for Federal Orthosonic radio in the northern New Jersey territory, operating as far south as Trenton, N. J. The Federal Badio Corporation's distributor for the New York area is the Superior Cabinet Corporation, 206 Broadway, New York City. B. J. Greenbaum is general manager. A. D. Strathy, sales manager of Cable Supply, announces the appointment of the following distributors for Speed tubes: The Gardner Badio and Electric Corporation, 2728 Locust Street, St. Louis, Mo., is handling southern Illinois and the state of Missouri exclusive of Kansas City; F. C. Somers, 115 E. 66th Street, Kansas City, Mo., is handling Oklahoma, Kansas, Iowa, and Nebraska; C. M. Mcintosh Company, McClintock Building, Denver, Colorado, is handling Colorado, New Mexico, Wyoming, Utah, and Eastern Montana; H. V. Scott & Company 506 S. Canal Street, Chicago, 111., is handling northern Illinois including the Chicago territory and Wisconsin; J. E. Date, 818 Nicollet Avenue, Minneapolis, Minn., is handling Minnesota and North and South Dakota; S. C. Steinharter, 2353 Greenfield Street, Grand Bapids, Michigan, is handling Michigan and Ohio; Martwell Sales Company, Inc., 1501 Broadway, New York, N. Y., is handling the metropolitan area of New York with a special concession covering furniture, musical, and departmental stores in certain other territories. Supreme: A new model of their set tester has been announced by the Supreme Instrument Corp. It will be known as the Model 400-b. This model does not differ fundamentally from the former model, No. 400-a, but there have been incorporated in the new tester certain refinements which will prove advantageous to the serviceman. The model 400-a will be continued so the 400-b constitutes an addition to the line. The new 400-b is designed particularly to take care of all the new receiving sets, (Continued from page 219) many of which will use higher voltages and screen-grid tubes. The 400-b can be used for making all types of tests on all receivers including those using screen-grid tubes. With this instrument it is possible to measure the full output of filament-type rectifier tubes. It is also equipped with a modulated oscillator, a tube rejuvenator for rejuvenating up to 12 tubes, and tubetesting features which make possible measuring the static characteristics of tubes The Supreme set tester, model 400-B. as well as testing when they are oscillating. With the instrument it is possible to adjust to exact resonance the various tuned circuits of a receiver. For this test the modulated oscillator is used to supply a signal to the input of the receiver, and the output of the receiver is measured in either one of two ways; one method utilizes the low scale of the a.c. voltmeter which is connected across the output of the set, the other method can be found only in the 400b which utilizes a thermocouple in conjunction with a d.c. voltmeter to indicate the a.c. output current of a special output transformer, the primary of which is connected across the loud speaker terminals. In adjusting the set, therefore, it is simply necessary to tune-in the signal from the modulated oscillator and then adjust the various condensers until maximum output deflection is obtained. Three meters used in the 400-b are as follows: D.C. Voltmeter, 4 scales 0-750, 250,100, 10. A.C. Voltmeter, 4 scales 0-750, 150, 16, 3. D.C. Milliammeter, 3 scales 0-125, 25, milliamperes and 0-2.5 amperes. Clarostat: A line ballast Clarostat has just been announced. It is designed for use in the primary circuits of power transformers and maintains the input voltage of the set constant within about 5 per cent. Badio Products: This company is manufacturing a number of instruments designed for use by dealers and servicemen in making measurements on tubes and receivers. The Flewelling tube-checker, model b, will test all of the following tubes 120, 199, 201a, 112a, 171a, 226, 280, 281, 250, 210,240, 245, 222, 224, Kellogg, and Cardon. The net price of this instrument to dealers is $22.75. The Flewelling Counter Checker, model c, makes it easy to test all types of radio equipment at the time of sale. Among other things it will test batteries, B-power units, transformers, resistors, and tubes. Price: $26.25. The Flewelling Badio Set Analyzer and Tube Checker is a combination instrument which makes possible the complete testing of receiving sets and tubes. Price: $85.25. Badio-Victor : Beductions in the list prices of seven types of Radioirons were announced June 12th by the Badio-Victor Corporation of America. The uy-227 was reduced from $3.00 to $2.50, the ux-226 from $2.00 to $1.75, the ux-222 from $6.50 to $4.50, the ux-280 from $3.50 to $3.00, the ux-112a from $2.50 to $1.25, the ux-201a from $1.40 to $1.25, and the ux-171a from $2.50 to $1.25. Large-scale production and improved tube manufacturing machinery were given by an official of the corporation as the reason why it has been possible to reduce prices. Detroit Badio Dealers Association: A special radio exposition to be held in* the Olympia at Detroit, September 9th to 15th inclusive, is being sponsored by this association. It is the purpose of the Association to direct public interest to the radio industry in advance of the usual peak season. The executive management of the exposition will be in the hands of Corley W. Kirby, managing secretary, and Bichard Dunn, general manager of the Olympic. meissner licensees B. F. Meissner, well-known inventor, has licensed the following companies under his patents: AU-American Mohawk Bremer-Tully (including sets made for Brunswick) Crosley Radio Corporation Consolidated Radio Corporation (Wells Gardner and Arborphone Divisions) Electrical Research Laboratories, Inc. A. H. Grebe & Co., Inc. Howard Radio Co. King Manufacturing Corporation Kolster Radio Corporation Splitdorf Radio Corporation (including its manufacture for Thomas A. Edison, Inc.) Stromberg-Carlson Telephone Manufacturing Co. U. S. Electric Corporation W albert Manufacturing Company The royalty schedules show the cost to the average maker will run in the neighborhood of twenty to twenty-five cents. Mr. Meissner's patents and technical services are largely in relation to design of filters, and in the reduction of a.c. hum. Other patents pending and issued include No. 191,195 with broad claims covering the low-voltage, low-temperature, high-heatinertia type of filament tube. It is said these claims cover the 226 and 245-type tubes. Patent No. 50,555 is said to cover the use of a tube having a cathode so designed as to generate small hum when energized with alternating current, preceding a tube having a cathode designed to generate large hum, and this, in order that the small hum can be used to neutralize the large hum of the preceding tube. This patent is said to cover any set using the indirectly heated type of cathode or 226 type of filament in the detector and first audio stage in advance of the 171, 245, 210 or 250 in the output stage. • AUGUST 1929 • • 241