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Not knowing whether the old flyback fried itself, or any other components, I have one important question: Did you check each resistor in the circuit for changes in value? I'm curious about the cathode resistor of the H. output tube, I assume you are measuring the cathode current with a meter in series? Is there a drive or coupling adjustment between the oscillator and the output-tube grid? Are there alternate taps for the yoke on the FLY-1? Lastly, what is the output tube? Hopefully, this info will help some others to take a stab at this.
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