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Check the voltage on that cathode (looks like pin 8). Maybe the Linearity pot (R6) or R54 is changing. You might have cooked a couple of 12AU7s.
EDIT: Another possibility is that the tube socket has developed leakage so that it raises the grid voltage.
Last edited by Notimetolooz; 06-23-2019 at 09:35 PM.
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