Radio Broadcast (May 1929-Apr 1930)

IN THE RADIO MARKETPLACE '"'~> News, Useful Data, and Information on the Offerings of the Manufacturer Improved Philco Speaker Philadelphia Storage Battery Company: A seamless fabric cone ten inches in diameter and entirely moisture proof is responsible to some extent for the improved reproduction obtained from the new Philco dynamic loud speaker. In the Philco receiver there is an acoustic equalizer by which the user can vary the reproduction to suit his personal preference. The dial is calibrated in channel numbers reading from 55 to 150. Trav-Ler Portable Sets Trav-Ler Manufacturing Corporation: Deliveries of the new portable radio receivers were started near the end of July. The line comprises three models in prices from $65 to $100. All of the sets may be adapted readily for operation on batteries, 110 volts a.c, or 110 volts d.c. The sets use four tubes consisting of one screen-grid tube, detector, and two audio tubes. The Standard model lists at $65.00, the De Luxe model at $75.00, and the Aristocrat at $100.00. New Bosch Radio Tubes American Bosch Magneto Corporation: This company will market a complete line of tubes under its own name. Bosch tubes in all standard types will be available. The Radiola Model 66 RadioVictor Corporation of America: The new Radiola 66 employs an improved a.c. super-heterodyne circuit which includes the tuned antenna coupling circuit, one stage of r.f. amplification, oscillator, first detector, two stages of intermediate-frequency amplification, second detector and one stage of audiofrequency amplification. The power output tube is the 24-5. The single tuning control is marked with readings from 0 to 100 which are projected and magnified for easy tuning. List price: $225.00. Mountford Resistors C. E. Mountford: This company has designed a resistance capable of meeting all usual requirements for use in modern radio receivers. The resistor has been designed for manufacturer's use to sell at a low price. Oxford Loud Speakers Oxford Radio Corporation: An auditorium t ype loud speaker having a diaphragm diameter of approximately 12 inches has been added to the regular line of dynamic loud speakers. The auditorium type is designed especially for use in theatres or in receivers where exceptional volume is required. According to Frank Reich mann, vice president and chief engineer, the plant is working at full capacity supplying dynamic loud speakers to set manufacturing companies. Portable Phonographs Caswell Manufacturing Company: This company manufactures portable phonographs and completely a.c. operated portable turntables with magnetic pick-ups. The Powertone model illustrated above uses a General Electric synchronous motor and a Pacent Phonovox electric pick-up. A record album is built into the cover. List price: $49.50. The following portable phonographs are made: The Aristocrat, $35.00; the Monarch, $25.00; the Gypsy, $20.00; the Melody, $15.00; and the Model 12, $12.50. United Air Cleaner Line United Air Cleaner Corporation: This company is manufacturing a complete line of magnetic and dynamic loud speakers, two complete screen-grid receivers, and also an electric turntable and a magnetic pick-up unit. The receivers are made by the Sentinel Manufacturing Company, a division of the United Air Cleaner Corporation. Dejur-Amsco Condensers The DeJur-Amsco Corporation: This company announces a new line of multiple condensers of the " bath-tub " type, complete with dial assembly. They may be had in from one to four gang units with or without dial and with from two to eight gang units with dial. Phonograph Equipment Motor Player Corporation: This company manufactures portable electric turntables and phonograph pick-up units. Style h portable contains an electric motor and phonograph pick-up and lists at $65. The Style i at $60 is similar but is contained in a somewhat less expensive cabinet. Separate phonograph pick-up units list at from $10.45 to $19.00. Electric Phonograph Units Allen-Hough Carryola Company: This company manufactures electric turntables designed for use by manufacturers in making either phonographs or combination radio-phonographs. The motor is of the synchronous type and revolves the turntable at 80 r.p.m. The Rotrola is an electric turntable and phonograph pick-up unit housed in a small cabinet and designed for use in conjunction with radio receivers to permit the reproduction of phonograph records. List price: $45.00. Transmitting Apparatus Jenkins and Adair, Inc.: A number of different styles of transmitting condensers and inductances are being manufactured by this company. Type kb variable condenser has a maximum capacity of 0.0006 mfd. with three-inch spacing between plates. The overall height is 68 inches and the overall weight is approximately 120 lbs. The condenser is priced at $550.00 net f.o.b. Chicago. The Type d inductances are made up with from 14 to 20 turns and are priced at $10.00 per turn. Ordinarily the inductances are built of copper strip but they are made of copper tubing if desired. Supreme Diagnometer Supreme Instruments Corporation: The Model 400-b is a complete instrument for making all types of tests on tubes, receiving sets, power units, etc. The instrument is known as a "Diagnometer" and is, according to the manufacturers, equivalent to a complete portable laboratory. Approximately 4-0 different tests can be made. New Zenith Models Zenith Radio Corporation: Four new receivers were announced recently by this company. They are known as the Models 52, 53, 54, and 55 and are priced at from $175 to $700. All of them incorporate automatic tuning and screen-grid circuits. Double push-pull amplification is used with two 227-type tubes in the first push-pull stage, and two 245-type tubes in the second or output stage. The Model 55 includes a device for remote tuning. Models 54 and 55 are designed for operation with a built-in loop antenna. Super Akra-Ohm Resistors Shallcross Manufacturing Company, manufacturers of Super Akra-Ohm resistance units: The Type 7-m units have an accuracy within 0.5 per cent, and the type 14-m has accuracy within 0.25 per cent. Toe break down voltage of the insulation on the wire is approximately 250 volts. New Pacent Line Pacent Electric Company: Phonograph pick-up units and electric turntables of the following models are now available. Type 106-A, a pick-up without tone arm, $12.00; type 106-b phonograph pick-up with counterbalanced tone arm, adapters, and volume control, $15.00 ; type 106-c Ultra Phonovox consisting of special pick-up with counter-balanced tone arm, gold finished, $25.00; type 1 10 electric phonograph 342 • • OCTOBER 1 929 •