Re: Leak Stereo 30 Plus - Setting Quiescent Currents
Check grid leak resistor values. If they have gone high this could encourage thermal runaway. Also worth checking them against the EL34 datasheet recommendation; it is not unknown for valve amp designers to use the 'cathode bias' limit as the value for 'fixed bias', as this makes the driver design easier and reduces distortion until the valves get a bit gassy.
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