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the AGC seems to have a bit too much AC ripple in it, no hash but ripple.
Not sure if that could account for the overly sensitive AGC adj. Anyway I will end up pulling the chassis and checking all the filter caps. No audio hum and no hum bars in the pic. I should check the B+ for ripple before I pull it out, IIRC there is a big power resistor that sits on top of the chassis, one side of which connects to the choke and is where they sams show the ripple (2v).
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