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RADIO BROADCAST. No. 28 Radio Broadcast's Set Ifata Sheets THE SONORA MODEL A-36 RECEIVER July, 1929 This receiver consists of four stages of tuned r.f. amplification, a coupling in the r.f. amplifier, a special first-stage a.f. transformer grid leak and condenser detector, and a two-stage transformer- phonograph pick-up, a push-pull output stage, an electrodynamic coupled audio-frequency amplifier. The set contains the following loud speaker, and an automatic control to compensate variations interesting features: combined electromagnetic and electrostatic in line voltage. AVERAGE VACUUM TUBE AND LINE VOLTAGES FOR SONORA INSTRUMENTS Models A-20; A-36: A-44; A-46 Brown-green Gnd.."VAnt Brown-yellow -> Black Red-black- Green Maroon-black- Maroon--- Black-blue-- Red-black- 'Green Brown' '-Brown-black '-•Maroon-black FREED-EISEMAN RECEIVER MODEL NR-78 A.C. The Nn-78 is a completely a.c.-operated receiver using five heater tubes, two power tubes arranged in push-pull, and a full-wave rectifier. Unlike many other sets, the antenna stage in this receiver is tuned by means of a variometer in conjunction with a variable condenser. Either a long or short antenna may be used. The set also contains a 1-mfd. condenser connected to one side of the power circuit so that the light socket may be used for the antenna by simjily connecting together two binding posts. N.C. N.C. For 60 Cycles 1 mtd. For 25 Cycles 2mfd. Line Switch 160 • JULY • 1929