The talking machine world (Jan-June 1928)

The Newest in Radio Radio Speakers Utah Radio Products Co., Chicago. Type XU combination cone and exponential horn for cabinet installation. Horn of special composition with an air column 34 inches long-. Front area 14J4 inches by 19J/2 inches; outsi, le dimensions 14% inches by 19% inches ; depth 145^ inches. Shipping weight 10y2 pounds. Equipped with Utah cone speaker licensed under Lektophone patents. List price $22. Diaphragm used in all Utah horn type loud speaker units, illustration showing patented tripod construction. Licensed on February 1 under the Willett patents, for exclusive use on XJtah loud speaker units. Diaphragm is connected to armature through tripod construction, allowing more freedom for diaphragm movement and decreasing necessary movement of the armature for any given vibration. Utah type XH combination cone and exponential horn, cabinet speaker, containing air column of special com position 41 Inches long. Front opening; height li'A inches, width 2VA Cone speaker used is licensed under Lektophone patents. List price $23. Utah type XB cone speaker for cabinet installation, containing same Utah unit as is used in model X speaker. Dimensions 9Va inches by 9]/2 inches by 5 inches. List price $16. AC Receivers The Atwater Kent Mfg. Co., Philadelphia, Pa. Model 38 AC radio receiver with seven tubes, listing at $125 less tubes. Single dial control, complete vision style. Type of AC tube to be used plainly marked on each socket. Power section self-contained and completely shielded. Two toggle switches appear on panel, one operating vertically to throw set cur sets; No. 62-R, 25 cycle ABC, for use with Fada six and seven-tube sets : 8(!-V, 00 cycle ABC senior, for use with Fada eight-tube sets — can also be used with Fada six and seven-tube sets, and 82-W, 25 cycle ABC senior, for use with Fada eight-tube sets, can also be used with six and seven-tube sets. Sixty cycle outfits are recommended for use on power lines having' from 50 to 60 cycles ; 25 cycle outfits are recommended for use on power lines having from 25 to 49 cycles. Size on all is 1814 inches long by 654 inches wide and 8'A inches high. Approximate net weight 41 pounds, shipping weight approximately pounds. Speaker Coupler Bremer-Tully Mfg. Co., Chicago, III. Bremer-Tully speaker coupler designed to improve tone quality, increase volume and add to the life of the speaker. Can be placed on the table or mounted inside the radio cabinet rent on or off, and the other operating horizontally to increase or diminish the sensitivity of the set for distant or local stations. The Modernistic 37, similar in -construction to the Atwater Kent Model 37 AC receiving set, but with a finish in black and white of modernistic designs, providing an entirely new effect in the finish of radio sets. The Model E radio speaker has been finished in a like treatment to match. AC Six-Tube Set A. H. Grebe & Co., Inc., N. V. Citv. Synchrophase AC Six, single dial, all electric, six-tube radio receiver. Has "local-distance" switch which makes it possible to obtain wider frequency band. Receiver consists of four major units: receiver proper, power unit, mounting frame for supporting receiver and cabinet. It has three stages of tuned radio frequency ampliflontion with Grebe tube isolation circuits in each R. F. stage; detector, with AC heater type tube and two stages of audio frequency amplification. Another development in the Synchrophase AC Six is a unique design of tube socket prongs. Bending the prongs to different, sharp angles insures perfect contact between the legs of the vacuum tube and the socket contacts. Chassis constructed of heavy aluminum with four reinforcing ribs which add to its rigidity. Selected mahogany veneers used in body of cabinet, while front panel is of stump walnut, finished in artistic design. The drum type dial indicator, which is illuminated, is graduated in kilocycles. ABC Power Supply F. A. D. Andrea, Inc., New York City. ABC power supply in four inches. Outside dimensions: depth 13'/< inches, width 2VA inches, height 24 inches. Shipping weight 14 pounds. f «J. TO SET or speaker cabinet as desired. No tools are required. The terminals of the speaker cord are simply inserted into receptacles of the speaker coupler. Installation is easy and convenient. AC-Former Karas Electric Co., Chicago, III. AC-Former designed to furnish an even, unfluctuating current of the cor rect 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. Cone Speaker Quam Radio Corp., Chicago, III. New improved Quam cone type speaker, operated with any radio set, whether power tube, push-pull amplification, or AC power. Built on models: No. 66-Q. 60 cycle ABC, for use with Fada six and seven-tube "stretched reed" principle, stretched taut between two points, delivering vibrations over a full arc. Built with special brackets for cabinet installation or finished in rich bronze brown with gold mesh center cone cover for external use. List price $17.50. Eight Tube Receiver Zenith Radio Corp., Chicago, III. New eight tube loop operated radio receiver, Model 15-EP, employing four stages of tuned radio frequency, tuned detector and three stages audio frequency amplification. Five condensers are permanently balanced on one shaft, shielded chassis, single control, electiically lighted dial, calibrated in both meters and kilocycles. Cabinet of walnut veneer, with folding loop and self-contained power speaker. List price (less tubes) $375. Portable Radio Trav-Ler Mfg. Corp., Chicago, III. Trav-Ler five-tube, single dial, portable radio receiver, weighing 2314 pounds. Batteries, loud speaker, loop aerial, enclosed in one small case. Attachments are furnished for use with antenna and ground and for Jones plug to use with larger batteries or battery eliminator. Finished in black mocotan trimmed with gold. Retail price $77.15 complete. Tube for Speaker Operation E. T. Cunningham, Inc., New York City. Type CX-350, a 25-watt tube designed to supply ample undisturbed power • for operation of heavy duty speakers. To use this tube receivers must be capable of supplying the high plate current and the necessary grid base, which is from -45 to -84 volts. The filament rating is 7.5 volts, 1.25 amperes. The material used is the rugged coated ribbon type; filament operates at a dull red heat. The current required may be supplied from the 7.5 volt winding of a power transformer. The tube is intended only for use in power amplifier equipment. The recommended plate voltage is 250 to 400 volts. Radio Aerial Progressive Labs., Chicago, III. The Aeropoise, an aerial for use with radio receiving sets. Has a receiving (Continued on page 96) 89