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I was glad to hear the success story. The resistor, R11, was definitely overheated and badly discolored, so it needed replacement. I just checked its resistance for fun once I got it out of the board, and it was within an ohm or two of its 330 ohm nominal value. That's a tribute to modern...

Jimmy, no need to pay since it's guaranteed for at least two years. I don't argue about what caused the failure, and I may make changes to prevent future damage from a failed CVT1 based on your experience, so it'll help both of us.

It's T1 that supplies power through CR8 CR9 and CR10 to that resistor. If something caused the 18v zener diode CR6 to fail shorted, R11 could overheat. I suppose that if the control winding in CVT1 shorted to another winding, it could have put current into that control loop and caused the...

That's why I asked if it was cyclic or random. Cyclic points toward an unstable control loop, so reducing the feedback constant by adjusting the pot could help. Random would make me look for a loose connection or bad solder joint somewhere.

See if turning down the sensitivity pot helps. I labeled it "transient response" on the board, and it's the pot next to the voltage adjust pot. Normally you don't need to adjust that pot from where I set them during test, but your generator may have a little too much "uniqueness". The second...

Is the instability cyclic, or random?