does not stabilize. Just drifts.
Can you be more specific? I mean, are we talking about a slow steady creep of a few ohms, or are we talking about quickly jumping around in large leaps from hundreds of ohms to thousands and back again? (Or something different?) And how long are you watching the meter drift before you remove the probe? It sounds to me like a capacitor is charging from the small current that your multimeter is providing but "drift" is not precise enough to be sure we're understanding the same thing.
Did you redo the continuity tests with the module removed from power?
I don't want to get in the way of JMan's generous assistance, but does it make any sense to remove that cap temporarily to take the measurements? Not sure how difficult that would be.
Please feel free to get in the way! I think Forcemusicgroup is a relative beginner (no judgement, we all start as beginners) and isn't sure how to go looking for problem spots on his own, so any thoughts on what might be going on are welcome as we try to find the issue.
That said, I want to be mindful that we don't get too distracted by things in the amp circuit when our main issue seems to be at the input transformer. These measurements that I'm asking him to do throughout the circuit are not so much to determine exact impedances but rather suss out any shorts to ground that might be hiding in there.
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As I said earlier,
based on what we've tested already over the last couple pages, I can only see one reason that there would be no signal on R0, and that is if there is a short to ground in the audio path somewhere. Otherwise, even if there are cold solder joints or burned out components or even cut traces elsewhere in the circuit, I can't come up with a reason why you wouldn't have signal on the right leg of R0. I know we have already verified the connections around the input transformer to death, but can you - in addition to answering the questions above - power the unit up, send your test tone again, and measure AC signal between [pins 2 & 5] and [pins 7 & 10] directly on the transformer (not on the J1 connector but the transformer pins themselves)?
