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The only part of the audio easily reachable with only the top removed is Sam's C88,
on the volume control tap. There's audio there, so the problem is at or after the
volume control wiper.
The plate contact of the audio output may be reachable, if so, I can feed audio there
with the set off and check the output transformer and speaker, and then try a new tube.
The audio in this set is a pain.
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