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before digging into the K6 did you check C45 the cap at the grid of the 6Cg7?
I cant recall if thats a disc or not, but would not hurt to check it out. Pin 2 resistance measruement check out?
But I agree the k6 is looking like the suspect.
one last thing tube socket ok? I would check the resistance measurement with a tubt socked extender. I have had micor fractures along the top of the tube socket where the pin bridges betweent the PCB pin and the socket hole.
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