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.RADIO BROADCAST. COURIER MODEL 65 This chassis is made by the United Repro- ducers Corporation. It uses three screen-grid tubes, power detection, and a combination of resistance- and transformer-coupled audio am- plification. All the condensers rotate in ball bearings. EVEREADY SERIES 30 The shields over the tuning condensers and transformers were removed when this picture was taken to show compactness and accessibil- ity of transformers, condenser drive, and varia- ble condenser. The antenna circuit ia tuned by the variometer at the extreme right. AMRAD RECEIVER An example of a well-designed chassis a&.sem- bly. Three screen-grid tubes are used in the radio-frequency stages and in the audio output are two245-type tubes in push pull. In the 1 Iter circuit is a Mershon condenser, a "self-healing** electrolytic filter unit. NINE NEW CHASSIS DISPLAYED /EMTH SERIES 50 Double push-pull audio amplification is used in this receiver in combination with a new twelve-inch dynamic loud speaker. At the right is the well-known Zenith feature, the automatic tuning device. " Press the button and there's your station." FADA MODEL 35 Features of this receiver are band-pass tun- ing circuits, screen-grid tubes in the r.f. ampli- fier, two 245-type tubes in push pull in the out- put. Note that the tuning dial is not only marked in degrees but also in kilocycles and wavelengths. STEWART-WARNER SERIES 900 In this chassis are found the following interest- ing features: power detector circuit, resist- ance-coupled audio-frequency amplifier, three screen-grid radio-frequency stages. Varying line voltage is compensated automatically by means of a line-voltage control. 1MIILCO CHASSIS An eight-tube a.c. neutrodyne receiver with tuned antenna input followed by three stages of radio-frequency amplification using 226-type tubes. One of the line of Philco "Neutrodyne- Plus" receivers manufactured by the Philadel- phia Storage Battery Co. BOSCH MODEL 48 Three screen-grid radio-frequency stages, a linear high-voltage detector, and a single audio- frequency stage employing two 245-type tubes in push pull are employed in the new Hosoh re- ceiver. In the above picture all shields have been removed. If If If i KOLSTER MODEL K-44 This picture illustrates a dismantled chassis to show the various sections. At the left is the receiver, and above is the loud speaker and the power supply. The a.f. amplifier is not shown. The set uses three screen-grid tubes in the r.f. stages aud a 245 iu the output. AT THE RADIO WORLD'S FAIR NOVEMBER 1 9 2 » • 13