Radio broadcast .. (1922-30)

Soiiora's New Line SONORA PHONOGRAPH COMPANY, INC.: The new Sonora sets designed for screen-grid opera- tion each have three screen-grid tubes, a power detector, and one stage of audio with two 245- type tubes in push pull. The chassis are all completely shielded. The dynamic loud speaker contains a filter to eliminate a.c. hum. The radio receivers are priced as follows: Ix>wboy $149.50; Highboy $179.50; DeLuxe $235.00. The combination radio-phonographs range in price from $190 to $695. A feature of the re- ceivers is the Synchro-tone Modulator that insures equally good reproduction at all volume levels. New Bosch Sets AMERICAN BOSCH MAGNETO COMPANY: The DeLuxe Highboy Model combines the new Itosrh screen-grid receiver with a dynamic loud speaker. The cabinet, has sliding doors. Price; $240. The Standard Model is priced at $168.50. New Zenith Models ZENITH BADIO CORPORATION: Features of the new Zenith receivers are screen-griil cir- cuits, automatic tuning, double push-pull audio amplification, remote automatic control, etc. The Model 52 lists at $175.00, the Model 53 at $275.00, and the Model 54 at $395.00. Sparton Announces D. C. Set SPARKS-WITHINGTON COMPANY: To meet the demand for d.c. light-socket-opera ted receivers two Sparton sets, the Models 931 and 301, have been designed. These models are available at the same prices as the corresponding a.c. models. New Atwatcr Kent Receiver ATWATER KENT MANUFACTURING COM- PANY: The Model 66 receiver is a screen-grid set using a total of nine tubes; three 224-, two 227-, and two 250-type tubes in push pull and two 281-type rectifiers. Price: $135.00. Electric Phonograph Motor PACENT ELECTRIC COMPANY: This motor. Model 140, designed for operation on a 50-60 cycle, 110-volt a.c. supply, is of the induction type and is designed especially for use in a phonograph-radio combination. RADIO BROADCAST New Jewell Apparatus JEWELL KLECTRICAL INSTRUMENT COMPANY The latest catalog of this company illustrates a number of new miniature instruments in bukelite cases. The line includes instruments for measurement of d.c., low-frequency, and high-frequency currents. Kellogg 25-cycle Sets KELLOGG SWITCHBOARD AND SUPPLY COM- PANY: Three new models designed especially for use in territories supplied with 25-cycle cur- rent have been added to the Kellogg line. They are known as the models 526, 527 and 528 and are similar in appearance and features to the corresponding 60-cycle models, 532, 524, and 525. New Philco Receiver PHILADELPHIA STORAGE BATTERY COMPANY: The new model 95 chassis employs an unusual circuit and a number of new features. Ahead of the first tube is a double-tuned circuit to eliminate cross talk. A two-element detector is used and this is followed by a 227-type audio amplifier. The two-element detector is a 227- type tube with the grid and plate socket terminals connected together. Such a tube has a linear characteristic over practically its entire operating range. The set is also arranged to equalize automatically the volume of all sta- tions. The tubes used in the set are: three 224 screen-grid tubes, one 227 detector, one 227 as an amplifier after the detector, one 227 as an ordinary audio amplifier, two 24-5's in push pull, and one 280 rectifier. The set will be available as a table model and in three differ- ent console cabinets. New Bremer-Tully Sets BREMER-TULLY MANUFACTURING COMPANY: The new Bremer-Tully receivers utilize four tuned circuits with 227-type tubes as r.f. ampli- fiers. In the output are two 245 tubes in push- pull. A phonograph jack is provided for use with an electric pick-up unit. The dynamic loud speaker has a ten-inch cone and its power suppJy has been designed so as to eliminate any uudtble hum. The standard Model Cl re- ceiver list* at $164.00. The DeUixe Model 82 lists at $195.00. New I hi m m ;irln ml Units HAMMARLUND MANUFACTURING COMPANY, INC.: Complete units for audio or radio-fre- quency amplifiers and several special compo- nents for use in screen-grid receivers are an- nounced by this company. Among the new items are a three-stage radio-frequency band-pass filter, a complete screen-grid r.f. amplifier, audio-frequency transformers, power-supply apparatus, etc. Marti Receivers Marti Radio Corporation: The Marti re- ceivers utilize screen-grid tubes as r.f. ampli- fiers. The output of the r.f. amplifier feeds into a 227 type power detector and from this tube through an audio amplifier to two 245-type tubes in push-pull. A dynamic loud speaker is used and the cabinet is of such dimension that the baffle length is 47 inches in its shortest dimension The set lists at $295 00. Stromberg-Carlson Model 816 STROMBERG-CARLSON TELEPHONE MANU- FACTURING COMPANY: In this receiver are com- bined the following features: automatic volume control, linear power detection, a "silent key" to cut out noise when tuning from one station to another, phonograph-radio switch, and a large diameter dynamic loud speaker. This company is also making an elect rodynamic loud speaker which is housed in a floor type cabinet. The loud speaker is designed for use with any standard radio receiver. The loud speaker is stated to be from two to four times more efficient than previous reproducers of this type. Grebe's Screen-Grid Radio A. H. GREBE AND COMPANY, INC.: An equal- ized band-pass filter using six tuned circuits, linear power detection, single-stage audio am- plifier, and a push-pull output circuit are fea- tures of the new receivers announced by this company. The set is known as the Model SK- 4 and is available in four different designs. The prices range from $219.50 for the most inex- pensive model to $450 for a combination radio- phonograph. The Brunswick Model 14 THE BRUNSWICK-BALK E-CoLLENDER COM- PANY. The Model 14 Burn.swick radio is a nine- tube receiver housed in a lowboy console. This set is completely a.c. operated and lists at $148.00. The Model 21 uses the same chassis housed in a highboy console, the list price being $174.00. The radio chassis is combined with an electric Panatrope in the Model 31 listing at $272.00. New Radio Accessories INSULINE CORPORATION OF AMERICA : This company is now manufacturing a number of new items which include various types of inter- ference eliminators, light-socket antennas, resist- ance type voltage regulators to control the line voltage, and a new 'Screen Gridifier," a device for use in converting old type receivers to be used with screen-grid tubes. This device is made in two models, one listing at $7.50 and the other at $9.50. Electrad's New Resistors ELECTRAD, INC.: This new resistor is recom- mended particularly for use as a plate resis- tance, voltmeter multiplier, and in general lab- oratory work. The resistance wire is nichrome, contact bands and soldering lugs being of Monel metal. It is made in values from 10,000 to 250,- 000 ohms and the prices range from $1.50 to $5.00. NO VEM HER 1929 •