Quote:
Originally Posted by mstaton
My '63 CTC-15 clone is exactly the same way. The audio board is quite bare, only 1 tube. It has the other 2 sockets but no supporting components. It is fed into the preamp and then to the audio amp. I guess these single ended 6BQ5 amps are pretty sought after. They are supposedly class "A" but don't quote me on that.
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From what I recall of the schematic the audio output board of the TV chassis was completely populated and ready to drive a speaker they just never connected the speaker to the audio output transformer on the TV chassis(which feels like a waste of parts!) and instead ran a line from the first audio amp(or detector, but I'm pretty sure they picked it off soon after the volume control) and fed it to their own separate audio chassis which drove the speaker.