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250 RADIO BROADCAST ADVERTISER "RADIO BROADCASTS" DIRECTORY OF MANUFACTURED RECEIVERS this issue of RADIO BROADCAST, we start a compre- hensive listing of manufactured receivers. The listing below will appear regularly in this place, corrected to the day we go to press. The Manufactured Set Directory is an additional service to our readers and takes its place with the "Manufac- turers' Booklets" section and the "What Kit Shall I Buy?" department, both of which are already very popular. With these three regular features of RADIO BROADCAST, the reader can survey the entire field and, with little trouble, secure the information he wants. A coupon will be found on page 255. All readers who desire additional information on the receivers listed below need only insert the proper numbers in the coupon, mail it to the Service Department of RADIO BROADCAST, and full details will be sent. Key Letters Ant.—Antenna r—Radio frequency stage d—Detector a—Audio frequency stage t—Transformer coupled res.—Resistance i—Impedance coupled o—Oscillator O—Output device C—C-battery connections Ca—Cable connections Bp—Binding posts M—Meter (instrument) Sh.—Shielded H—Headphone connection included pp—Push pull KEY TO ABBREVIATIONS m—Meters (wavelength) TRF—Tuned radio frequency URF—Untuned radio frequency Super—Super-heterodyne Ne—Neutrodyne bal.—Some means of neutralization gr—Grid resistances Br—Bridge neutralization reg.—Regenerative int.—Intermediate amplifier r.f.—Radio frequency rheo.—Rheostat mod.—Modulator pot.—Potentiometer w—Watts Wt—Weight in Ihs. Tubes 99—60-mA. filament (dry cell) 01A—Storage battery 0.25 amps, filament 12—Power tube (Storage battery) 71—Power tube (Storage battery) 16B—Half-wave rect. tube AC—Using a.c. (heater type) Hmu—High Mu tube for resistance-coupled audio R—A gaseous rectifier tube 20—Power tube (dry cell) Tun—Tungar rectifier MV—Multivalve (several elements in one bulb) 10—Power Tube OOA—Special detector 13—Full-wave rectifier tube 2A—Tungar rectifier SOCKET-POWER RECEIVERS FOR USE WITH 110-120 VOLTS 60-CvcLE A.C.