Sync symptoms

[DaveWM]

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.