Quote:
Originally Posted by jbivy
Do you think there is anything I should know before i order the new wire and caps for this? Any idea as to how i register the output, so i can determine the size of the speaker this will need?
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My original thought was this is a home built code practice beeper, less speaker, and with the jack on the front panel to plug in the key.
Then Tubeology Reece came up with an audio output booster, and that makes more sense. I suspect that the switch can either direct the sound to one of two speakers, or between speaker and headphones, or possibly switch between inputs. There is obviously some 4 wire input (output?) on the front.
Before you start ordering any parts, I'd suggest that you circuit trace and draw a circuit diagram to confirm exactly what you have.
Regarding the size of the speaker, although using a different filament voltage and wired differently, the single 2A5 is electrically equivalent to the more modern 6F6. I have a 63 year old amplifier with a pair of push-pull 6F6G's running a plate voltage of 360V and feeding a 12 inch two-watt speaker with a 1060 ohm field coil. A single 2A5 can deliver only about a half watt. (Maybe one watt with little 'vintage' distortion.)
James