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I've recently put together & installed one of the replacement KLM-367A PCB's, and I'm thrilled that it is nearly 100% working. I have two Polysixes and it performs identically in each, so I assume the issue is probably somewhere on the replacement PCB.
The issue is that the EG mode of the VCA isn't working correctly. Gate mode works properly, but when switched to EG there is a constant drone of the oscillators (immediately, before even playing a note). Notes can be played over the droning oscillators and the envelope settings seem to function correctly (ADSR sounds fine), except for the constant droning of the oscillators. "Hold" in the key assigner section seems to be working properly. Everything else seems to be working properly.
I know there is a VCA attenuator topic active lately, pointing to issues around IC34 or IC35. I checked for continuity between a few points of IC34 and KLM366, but so far I still haven't been able to figure out my issue.
So close! Can anybody give me some more specific guidance or tips? I have a DVM but only soundcard scope software. Any help would be very, very appreciated!
JT