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Because of the way that circuit regulates it's not going to be very happy being brought up slowly on a variac. It needs to have the expected line voltage within a window in order to lock in oscillating. You pretty much need to make sure the filter caps on all the outputs of T602's secondaries are good. The oscillator circuit relies on the -100 volt supply and 85v reference in order to regulate all the secondary voltages proportionally. It's a feedback loop intended to shut down all the secondary supplies if it's not getting the correct reference voltages.
Last edited by Kevin Kuehn; 01-14-2021 at 02:23 PM.
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