Quote:
Originally Posted by Olorin67
I have a couple farm radios..one of them is real crazy, a battery farm set that was later electrified by putting in 12 volt tubes, a rectifier, and a resistance cord to drop extra volts..the set as it is now bears little resemblance to the original schematic.
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I saw a real novel AC conversion on a 6 volt battery operated Zenith model 4V31 tombstone farm radio.
The conversion consisted of removing the synchronous vibrator and rewiring the power transformer, as a heater transformer. The B+ was furnished by a selenium and R/C filtering. The B+ voltage needed was rather low, like 125 volts.
The conversion was rather "hack" using a hot chassis. That model uses a 38 output tube and a magnetic speaker.
I converted the same radio, using a different transformer and never thought of using the vibrator transformer as a heater transformer.
