Unknown farm radio
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The tubes in this radio are:
The radio can use an 'A-B' battery pack which contains a 1.5v 'A' battery and a 90v 'B' battery in one package, or three separate batteries, two 45v in series, and one 1.5v |
| Of course no rectifier tube or large filter capacitors are required so the chassis is very simple. Also the use of 1.4v filament tubes means that no ballast/regulator tube is required to control the filament current. A typical radio using these tubes was the Philco 39-71. So this seems to date the radio to about 1939. From 1940 on these radios seem to have been using different, more efficient, output tubes. | |