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CPU Socket replacement took a very long time: it's really hard to first, remove solder and then empty the vias. I sometimes used a mechanical pencil lead to help in addition to a solder bulb. Tested continuity of the CPU pins, and apparently only one trace was damaged during the operation, so I had to add a jumper for CPU-30 to C11-1 and to C10-5 if memory serves me well.
Pulse trains on C10 are okay. Pulse on CPU-1 isn't, but sometimes this comes back.
The Polysix reacts mostly the same: no control for a while, until some combination of the pots make them 'latch'. I noticed loss of control of some pots like MG: MG seems fixed at high frequency.
The Cutoff pot seems to have less noise now, i.e. less affecting Resonance, so I guess that's a plus. When it sounds, the Polysix sounds great.
I guess my next step would be to test voltages again between the pots and KLM-367. Oh and also socket IC5 and IC6, but I've done an overdose of desoldering since yesterday, so I may leave that for another time.
Yash