Quote:
Originally Posted by Steve McVoy
Could there be a center tap on the secondary that is tied to ground inside the can?
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Good point. There might even be additional components hiding in the can. I'll try injecting a 4.5 MHz FM signal into the grid of the 12AU6. As Tom C. pointed out, the circuit may not be getting a signal to demodulate.
(Just a thought, when did the sound carrier switch from AM to FM?)
Bob D.