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Can you still find SG613's The ECG sub did not hold up well
Its been since 1988 since I've worked on one of those. If memory serves their was a wonky diode in the startup supply that would leak injecting its pulse onto the gate of the SG613. The pulse width was to wide and poof! Given the age of the set replacing diodes and series pass regulator xister and small electrolytics in the LV power supply should make it a happy set.
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