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Early transmitters used 5V filaments as well. The 6166 tube used in the TT25BL transmitter was 5V. It was used as a power amplifier driver. It was a rather bad idea as the filament contacts would burn up over a period of time due to the high current. On a cold morning you might have to reach in there and twist the tube in the socket to make contact before you could sign on.
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Last edited by kf4rca; 11-11-2025 at 03:38 PM.
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