Radio broadcast .. (1922-30)

IN THE RADIO MARKETPLACE News, Useful Data, and Information on the Offerings of the Manufacturer Stewart-Warner Console STEWART- W A RN ER CORPORATION: The Stewart-Warner screen-grid eight-tube receiver is available in a Tudor period console. The set (illustrated below) is priced at $131.50. Arcturus D.C. Tubes ABCTURUS RADIO TUBE COMPANY: This company will make d.c. tubes of the following types: 012A, 10lA, 099, 122, and 07lA. Arcturus previously manufactured only a.c. tubes. New A.F. Amplifier Manual RADIO RECEPTOR COMPANY : For the purpose of guiding servicemen and dealers in the proper planning, selection, and installation of various types of amplifier equipment this company has issued a booklet containing considerable data on amplifiers. It covers such matters as gain, loud speakers, transformers, microphones, etc. The booklet also contains complete data on the various products manufactured by this company. Timing Device TIMING DEVICES INCORPORATED: This unit is designed for use with a standard radio re- ceiver, the electrical connections being such as to place the timer in series with the circuit be- tween the radio receiver and the light socket. The unit is operated by means of a coin which causes the radio receiver to be turned on for a certain length of time. Utah Loud Speakers UTAH RADIO PRODUCTS COMPANY: This com- pany manufactures a number of electrodyna- mic and magnetic loud speakers. The various models are priced at from $15.00 to $55.00, The chassis may be secured separately or the unit may be obtained in a cabinet. Weston Tube Checker WESTON ELECTRICAL INSTRUMENT CORPORA- TION: The Model 533 Tube Checker is designed for use by dealers in checking tubes as they are sold. The tube is checked by noting the reading of the meter and then pressing a button and noting a second reading. From these two readings a direct indication of the worth of the tube is obtained. Price $50.63 net. Durham Fixed Resistors INTERNATIONAL RESISTANCE COMPANY: Modifications in the coating material and in the size of the filament have made it possible for this company to design resistor units with three or four times the safety factor of present units. Units rated at 1 watt have been placed on londs up to 15 watts at which load the heat became so intense as to melt off the end cap but the conducting filament was not damaged. Wright DeCoster Speakers WRIGHT DECosTEH, INC.: A number of reproducers for use in connection with radio receivers but similar in design to those supplied in the sound-movie field are now being manu- factured by this company. The loud speakers are available in various types of cabinets. Volume-Control Resistors RADIO RECEPTOR COMPANY: This company is manufacturing a new line of volume controls for various uses. The controls will be made in all ranges and sizes. In addition the company recently announced a line of microphones, electric pick-up units, electrodynamic loud speakers, and other apparatus used in a.f. amplifying systems. New Westinghouse Charger WESTTNGHOUSE ELECTRIC AND MANUFACTUR- ING COMPANY: The new battery charger manu- factured by this company uses a Rectrox recti- Atwater Kent Model 100 ATWATER KENT MANUFACTURING COM- PANY: A new walnut lowboy cabinet, Model AK-100, has been added to the regular line of cabinets available exclusively for Atwater Kent fier. This rectifier has a long life and is perfectly dry. The unit is ideal for charging radio and automobile batteries. DeForest Dry-Cell Tube DEFOREST RADIO COMPANY: The 499-type audion differs from the 199-type tube mainly in its filament construction. The 499 uses an oxide-coated filament of about three times the cross sectional area of the usual thoriated tung- sten filament while emission from the 499-type filament is about four times that obtained from the thoriated tungsten type. The tube has a mutual conductance of 415. An oxide-coated filament is also used in the 422A, the DeForest d.c. screen-grid tube. Emission from the filament averages 50 mil- liamperes and the filament current is only 60 mA. at 3.3. volte. Automatic Phonograph HOLCOMB AND HoKE MANUFACTURING COMPANY: This company manufactures a num- ber of continuous-playing, automatic, electric phonographs. The unit uses a three-stage audio- frequency amplifier with a ten-inch electrody- narnic loud speaker. The units are made with or without a coin-operated mechanism. screen-grid receivers. The dimensions of the new cabinet are: height 38J", width 24i", and depth 15". Flechtheim Fixed Condensers A. M. FLKCHTHEIM AND Co., INC.: This com- pany manufactures a complete line of by-pass condensers, filter condensers, high-voltage transmitter condensers, and grid and plate blocking condensers for use on potentials up to 2000 volts d.c. By-pass condensers are available in various capacities from 0.1 to 4 mfd., and filter condensers in capacities up to 4 mfd. and in blocks. Clarostat Volume Control CLAROSTAT MANUFACTURING COMPANY: To meet the requirements of receivers in which the volume control must operate simultaneously in two circuits the dual-type wire-wound resistor has been designed. It is made up of two standard units mounted in tandem. Each unit may be wound to any resistance and a power switch may also be included in the assembly. Wall Type Loud Speaker BEST MANUFACTURING COMPANY: A loud speaker has been designed especially for in- stallation in hotels, schools, and other build- ings where programs are distributed by a centralized amplifier. It is 10^" square, is equipj>ed with a magnetic unit, and is designed to be installed in the wall of a room. New Philco Models PHILADELPHIA STORAGE BATTERY COMPANY: The Model 95 is a nine-tube receiver with auto- matic volume control using three screen-grid tubes, two 227-type tubes, two 245-type, and one 280-type. It is available in various models priced from $67 to $195. The model 76 is a seven-tube receiver using two screen-grid r.f. amplifiers, a screen-grid detector, a 227-type a.f. amplifier in the first stage, two 245-type tubes in the second a.f. stage, and one 280-type rectifier. Prices range from $97.00 to $225.00 298 • RADIO BROADCAST FOR MARCH •