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Definitely some weird stuff going on in the vertical height section. Control is too low value (2.5M vs 4.7M) and it seems that someone shoved a higher-value resistor (3.5M vs 2.2M) before the wiper to compensate... which would likely be the culprit as the minimum value of the control is now much higher. I conveniently happen to have some 2.2meggers on hand... no replacement control, but I'd only need to worry about that if I get excessive height after replacing the resistors & with the control turned up.
Any comments on the spot killer capacitor from G1 to B+? I don't think B+ to G2 will work as G2 is driven around the same as B+ and wouldn't go sufficiently negative to clamp emissions. Would anything catastrophic happen if I just picked a value and tried it?
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