The talking machine world (Jan-June 1928)

The Newest in Radio AC Receivers F. A. 1). Andrea, Inc., Lone Island City, N. Y. Three new models of AC radio receivers, known as the Fada AC Seven console model, with seven tubes, listing at $350, less tubes; Fada AC Seven table model, seven tubes, listing at .$250, less tubes and floor cabinet, and Fada AC Special table model, six tubes, listing at $160, less tubes and floor cabinet. The UY-227 or C-327 type tubes are used in all sockets except the power-tube socket in which the UX-171A or CX-371A tube is used. All of the AC receivers have in the electric unit a toggle switch permitting the use on lines as low as 90 to 110 volts in one position and 110 to 130 volts in the other position, making it a receiver to be used in any locality. The new models have a condenser across the power line for draining the line of interference and objectionable noises. Other features include: All transformers and chokes sealed to prevent moisture attack and mechanical vibration ; automatic grid voltage control. AC Ballast Daven Radio Corp., Newark, N. J. Daven AC 20 Ballast and Daven AC 27 Ballast designed to prolong life of alternating current tubes. They compensate for any voltage or current fluctuations due to inaccuracy in transformer windings, line surge or overload. Used with any standard filament transformer the Daven AC 27 Ballast, operating with a twenty-volt line variation, gives total variation of .17 (17/100) of a volt. The minimum is 2.2225 volts and the maximum 2.4 volts. The AC 26 Ballast, operating from a transformer normally delivering two volts and with a twenty-volt line overhead gives a total variation of .16 (16/100) of a volt on type 220 tubes. The minimum is 1.3 and the maximum 1.46 volts. "ABC" Unit Acme Electric & Mfg. Co., Cleveland, O. "ABC" unit, furnished either to set manufacturer in kit form or to jobber and dealer mounted in steel container. Built in two models — one to operate with Arcturus tubes and other to be used with new Radiotrons or Cunningham AC tubes. The "A" supply when used with the Arcturus tubes delivers 15 volts and for RCA tubes a voltage of l'/j, 2V& and 5 volts is furnished. The "B" eliminator taps may be varied if the requirements of the set are not met with. A "C" voltage of 45 volts is furnished, existing between the center tap of the flvevolt winding and the negative "B" eliminator terminal. Unit has six taps, uses the UX-280 full-wave filament type tube on the "B" side and will deliver 40 milliamperes at 180 volts. Tone Clarifier Dubilier Condenser Corp., New York City. Tone clarifier containing a special choke coil and a 4 mfd. condenser of 400 volt rating. Is employed as an output filter or loud speaker Alter coupler and can also be used as an external filter section for additional filtering for the detector plate circuit. "Tri-Power" Unit Sterling Mfg. Co., Cleveland, O. "Tri-Power" unit supplies "A," "B" and "C" voltages to six-volt DC sets and converts them to use AC tubes. Is quickly connected to set in place of batteries or battery eliminators : new AC tubes are inserted and the receiver becomes a strictly AC set, obtaining its power direct from the electric light socket. Is applicable to practically all popular makes of Ave. six and seven-tube sets. Special adapters are furnished to specification for sets which vary from the standard circuit layouts. Single switch operation is made automatic by connection to receiver filament switch, or by external switch, depending upon receiver design. Radio Corp. of America. Radiola Hi, with desk cabinet that harmonizes with the receiving set. Operates with batteries or with lighting socket-power devices. Three radio-frequency coils are mounted at right angles to each other, preventing interaction and adding to selectivity and stability. Radiotron UX-112 is used in last audio stage. List price, complete with Radiotrons, .$00.50. Cone Speaker Farrand Mfg. Co., Long Island City, N. Y. Concert speaker of cone type enclosed in frame finished in walnut with richly enameled corner panels. Height, over all, 22 inches. Is said to reproduce the bass tones perfectly while retaining all of the treble notes. Able to accept utmost volume without distortion and built to withstand all necessary high voltage. List price, $35. Rubber Plug Belden Mfg. Co., Chicago, 111. Soft rubber plug furnished attached to different varieties of cords in 10, 20 and 50-foot lengths. Plug is rigidly constructed of solid soft rubber. Is shaped to form a convenient grip for the fingers when plugging-in or pulling out. AC-Former Karas Electric Co., Chicago, 111. AC-Former designed to furnish an even, unfluctuating current of the correct voltage to the new AC tubes, and in conjunction with any of the standard cable harnesses on the market. Said to offer an easy method of converting any battery set to AC tube operation. AC Receiver Zenith Radio Corp., Chicago, III. Model 18 E, AC six-tube electric receiver, single-dial control, electriclighted dial. Dial is calibrated in both meters and kilocycles. Receiver operates on 110-volt alternating current of 00 cycles. Cabinet of selected walnut veneers, door panels of figured maple. Built-in reproducer gives unusual tone quality and volume. Price, less tubes, $272. Console Speaker Temple, Inc., Chicago, HI. Console model No. 85, cabinet loud speaker, contains same 76-inch air column as No. 18 Senior speaker. Contains compartment for "A" and "B" batteries or power-unit equipment. Cabinet finished in walnut, Spanish design. 36 inches high, 25 inches wide, 15 inches deep. Priced at $S5; West of the Rockies, $95. 89