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Struggling with an ST-70

goldswimmerb said:
Wound up figuring it out by inspecting the wiring very carefully (the colors have faded some). At some point a previous owner had swapped a Blue/white and green/white cable (as they look the same unless you look closely). So anyway I had a Plate and screen pin flipped on one channel, swapped that back to how it was supposed to be and everything is working as it should. Also replaced the rectifier tube since the old one was absolutely shot.

Very minor transformer hum is the only thing I notice now and it's expected on an ST-70 with the original transformer running at what the line voltage is here.
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Glad that you got it running ! Now it's time for music
 
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