Radio Broadcast (May 1929-Apr 1930)

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Fourteen Leading Manufacturers Describe IMPROVEMENTS IN 1929-30 RECEIVERS A-C DAYTON COMPANY Ford Studebaker, Chief Engineer: In designing our receivers for the 1929-30 radio season we have endeavored to combine the following features: selectivity, tone quality, sensitivity, volume, and ease of control. The" pre-selection " method of tuning, which is the most practical for obtaining maximum selectivity without critical characteristics, has been incorporated in the receiver. In order to obtain sensitivity we are using a five-stage r.f. amplifier with a very flat amplification curve. Grid-bias power detection is employed with the output of the detector feeding directly into a push-pull output a.f. stage employing two 245-type tubes. Among the other features which have been built into the set are complete static and magnetic shielding, electrolytic filter condensers which preclude the possibility of breakdown, single-control tuning, a simple positive volume control, a single switch to control the set and loud speaker, devices which provide for any type of loud speaker, a switch which permits instantaneous change from radio reception to phonograph, and a multi-plug which provides a ready means of connecting the integral units. Individuality is maintained by really different cabinet combinations. BALKEIT RADIO COMPANY Glenn L. Alspach, President and General Manager: One of the most important features of our 1929 receivers is the new dynamic loud speaker which is more sensitive, more brilliant across the entire tonal range, and fully capable of handling the entire volume of the receiver without distortion. In the new Balkeit console receivers five stages of r.f. amplification and a 245-type output tube are employed. Particular attention has been given to the acoustical features of the cabinet in order to insure full volume without distortion. These cabinets have rigidity of construction with ample baffle area, and interfering elements in their structure have been avoided. Another feature of the receivers is dependability and freedom from routine attention. In other words, in the new Balkeit we have striven to make available to the user a high order of selectivity, sensitivity, and tonal quality, at the same time employing improved methods of construction which assure complete satisf action. It is a balanced set without extremes, its cabinet blending with its surroundings. BREMER -TULLY MFG. COMPANY R. E. Smiley, Vice President: With the recent announcement of the purchase of the capital stock of the Bremer-Tuliy Manufacturing Company by the Brunswick-Balke-Collender Company, there is placed at the disposal of this com rord studebaker, chtej pany a combination rarely engineer, A-C Dayton Co. found. This company has always been famous for turning out splendid radio receivers, and our receivers, which will be offered for sale this year, will combine a rare degree of selectivity, sensitivity, and true fidelity of tone. Coupled with these superior qualities to be found in our radio receiver will be finer cabinet work with designs made to fit into the home on the basis of beauty and utility. These factors, very much in line with the radio trends of 1929, together with keen merchandising policies, will give to the public, a type of product that will insure pleasure and satisfaction in every way. THOMAS A. EDISON, INC. Arthur L. Walsh, Vice President: Greater volume without distortion, the accomplishment of uniform amplification over the entire wave-band, and the advent of the 245 tube, are the outstanding developments of the 1929 radio season. The desirability of having uniform amplification over all graduations of the scale has been an engineering ideal for a long time. That it is now consummated I regard as the engineering accomplishment of the year. Uniform at all dial settings as to selectivity and sensitivity, with faithful re-' production, the best examples of the new radio receiver bring to the public excellent instruments at moderate prices. Edison Radio embodies these latest ideas in receiver design, including the correct utilization of the 245 tube. The Edison chassis includes two of the 245 tubes in push-pull (the combined undistorted power output equalling that of a single 250-type tube at voltage usually employed), three of the 227 indirect-heater-type tubes used as radio-frequency amplifiers, two 227 tubes employed as detector and as first audio-frequency amplifier, and a 280 tube as rectifier. The new Edison Radio line, with a single chassis and models varying only in cabinet design, is the finest that can be built. FEDERAL RADIO CORPORATION L. W. James, Assistant to the President: Compactness of radio receivers seems to be the trend for 1929. Simplified circuits requiring a minimum of servicing, yet maintaining good fidelity and improved sensitivity and selectivity is another outstanding feature of the new sets. There is also an increasing demand for provision for phonograph pickup units. Federal's new receivers, notably the model k, lends itself to the desire for compactness. The use of a.c. screen-grid tubes and push-pull amplification increases the amplification and reduces the complications of the circuits. Good fidelity is maintained through the use of a dynamic loud speaker. The cabinet design meets the deGlenn L. Alspach, pres , idem Balkeit Radio Co. mand oi the apartment 74 • • JUNE • 1 929 •