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The resistor parallel with the cap looks like a 620 ohm but I measured 82 ohm. Not sure why they reworked the circuit and added a 25 MFD electrolytic on the wiper of the contrast pot to ground. And they grounded the other end of the pot when it should have been left floating.... A mystery.
That cap and resistor shouldn't even be there and that wire should be wrapped or soldered on a lug to pin 1 of the 12BY7.
Last edited by Davala; 03-09-2024 at 11:09 PM.
Reason: clarity
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