The talking machine world (Jan-June 1928)

The Newest in Radio three variable voltages are also available, as follows: detector voltages, 22 to 45, adjustable; R.F. voltages, 50 to 75, adjustable, and A.F. voltages, 90 to 135, adjustable. The voltages as indicated make it impossible to place an excessive or harmful voltage where it does not belong. The case is finished in black crackle lacquer. It is compact, measuring ll/2 inches high, llA inches wide and 7^2 inches long. All-Electric Radio Chas. Freshman Co., Inc., New York City. All-electric Equaphase model G-10 contained in cabinet and complete with tubes, cone speaker and power unit. Illuminated dial is calibrated in wavelengths for simplicity in tuning. Cabinet has panels of genuine mahogany attractively inlaid. A desk type drop panel covers the set when not in use and provides a convenient rest while it is being operated. Price range from $153 to $500. A.C. Receiving Set Atwater Kent Mfg. Co., Philadelphia, Pa.. Model 37 house current all-electric A.C. receiving set. A sixtube receiver comprising three stages of radio frequency amplification, a detector and two stages of audio frequency amplification. The set is singledial controlled and is self-contained in a metal cabinet which completely shields the electrical assembly, including power supply which in turn is surrounded by metal shields. Finished in brown and gold or bronze and gold. Dimensions: length 17M inches, depth 10% inches, height 7% inches, net weight 37 pounds ; packed for shipment 48 pounds. "B" Battery Loud Speaker Temple, Inc., Chicago, 111. Powerola loud speaker, incorporating complete audi© frequency system, matched with a Temple air column and reproducing unit so as to give the most uniform sound output. Power amplifier consists of especially designed audio system, using standard UX-266 tube as one stage with a push-pull stage of two UX-171-A tubes: rectifying system uses a UX-2S0 tube: furnished in walnut cabinet. Can also be used as complete phonograph unit by addition of conventional magnetic pick-up. Powerola licensed under patents of Radio Corp. of America and associated companies, and sold only with tested standard RCA tubes. Price of complete set of tubes, $17; price of Powerola, without tubes, $295, West of Rockies $312. French Battery Co., Madison, Wis. Master Ray-O-Vac, No. 9303, a 45volt "B" battery of the vertical type. Thirty extra large cells give 45 volts with one intermediate tap at 22J4 volts. Is equipped with screw-post terminals, and is used with radio receivers of four or more tubes. Dimensions, including terminals, are 8 inches by 4J6 inches by TA inches. Lists at $4.75. Power Supply Unit National Co., Inc., Maiden, Mass. National-B, type 7180, power supply unit will supply 70 milliamperes at ISO volts, sufficient for operating the largest radio set, equipped with the UX-171 power tube. In addition to the fixed power tube voltage of 180, A.C. Tube Arcturus Radio Co., Newark, N. J. Hi-Mu tube, type A.C. 32, mounted on a standard four-prong base plugging into the usual UX socket. The tube is of a heater-cathode type, operating from a 15-volt source, the heater consuming .35 ampere. The amplification constant of the A.C. type 32 tube is 30, the plate impedance 40,000 ohms and the mutual conductance 700 ohms. The tube is recommended for use with an applied amplifier voltage of 180 and higher, and a grid bias potential of minus 1.5 volts. Two New Radio Sets Apex Division, United States Electric Corp., Chicago. The Apex Milan electric 6-tube neutrodyne receiver, with three stages of radio frequency, detector and two stages of audio amplification. Single and Positive drum-drive control. Equipped with cone speaker and supplied in cabinet of 5-ply selected walnut with threecoat lacquer finish. List price, less tubes, $192.50. The Apex Division, United States Electric Corp., Chicago. The Music Chest, 6-tube, shielded D.C. neutro dyne receiver with three stages of radio frequency, detector and two stages of audio amplification. The Music Chest has Single and Positive drum-drive control, illuminated dial and is supplied in a 5-ply selected walnut cabinet with a natural wood panel. Retail price, $65, less accessories. Eliminator The Abox Co., Chicago, III. A fourvolt Abox "A" battery eliminator for the operation of all sets using 199-type tubes, including Radiolas. This unit will operate receivers using up to twelve tubes, and is basically the same in principle as the Abox six-volt "A" battery eliminator. In it is incorporated the Abox filter, containing electrolytic condensers of large capacity. The Abox unit supplies full-power "A" voltage direct from the light-sor.liet to any receiver without changes in wiring or tubes. Electrical Pick-up Pacent Radio Corp., New York City. Phonovox electrical pick-up equipped with an adapter for use on all radio receivers using A.C. tubes. Is known as Catalog No. 105AC and lists for $12.50. Eliminator Fansteel Products Co., Inc., North Chicago, 111. Balkite "AB" replacing "A" and "B" batteries, supplying radio current from the light-socket. Operates only while set is in use. Is of the electrolytic type, contains no voltage controls and requires no atten tion other than the addition of water three or four times a year. Furnished in two models : No. 6-135, for receivers using sixvolt "A" batteries and either 201 or 112 tubes, priced at $64.50, and No. 6-180, serving any standard receiver using a six-volt "A" battery and either 201A, 112 or 171 tubes, priced at $74.50. Electric Receivers The A-C Dayton Co., Dayton, O. Four models: the XL-50 electric console compact six-tube receiver and XL-60 electric console full-size sixtube receiver, same cabinet used on both models, and contains built-in speaker of large sea-shell type which gives low, full tones; the XL-50 electric console grand and the XL-60 electric console grand, both models installed in A-C Dayton Duophonic reproducing console grand cabinet, reproduction obtained by use of two speakers. List prices of models in order named : $230, $260, $320 and $350. Filtering Device Janette Mfg. Co., Chicago, 111. New filtering device on rotary converters, used for operating A.C. receivers on direct-current circuit. Furnished in two sizes : one converting direct current to 60-cycle, 110-volt alternating current with a capacity of .3 K.V.A., the larger size produces .5 K.V.A., 60cycle, 110-volt alternating current and is recommended for heavy duty, such as demonstrating A.C. sets in radio stores. Both machines may be obtained without filter, which is required only when machine is to be used for radio operation. 89