Zenith Model 4-V-31 Tombstone Farm Radio (1936)

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Zenith Model 4-V-31 Tombstone Farm Radio (1936) Zenith's model 4-V-31 (4V31) tombstone-style radio, intro- duced in the summer of 1935 at $39.95, was designed to operate from a 6V lead-acid battery. Many rural locations at the time, especially farms, were not connected to the electricity supply and as a result there was quite a niche market for so-called "farm" radios. The 4-tube 4-V-31 cov- ers standard broadcast from 500-1800kc. The tube line- up is 15 (LO/ mixer), 15 (IF), 75 (2nd detector/AGC/1st AF) & 38 (AF O/P). At the hart of this set's power-supply is a vibrator, serving to convert 6V DC from the battery to AC, whereupon it is stepped-up in voltage and converted back to DC, using the same vibrator, and smoothed to provide the B+ supp- ly. The filaments in this set are supplied directly from the 6V battery.

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