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Schematic? Shelf?

It would be impossible to know why the circuit gets hot without seeing the schematic, but on the other hand, that cabinet is not ideal for dissipating heat from the tubes, etc. Have you tried sitting it up on the top shelf, with nothing above it to block heat dissipation?

Or if you have no schematic and if you've already ruled out the cabinet as the cause, do you know the plate dissipation of each of those 3 6SN7s? That would certainly give one a clue.



Edits: 05/12/17

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