Sounds like its the JJ tubes giving you the problem.
Did you throw the bias probe on all 4 output tubes? Make sure that all four are showing bias current. I had a power tube blow in my Roadster once, replaced the fuse, and threw my old set back in. I thought all was good, but after a week or so I felt the amp didn't feel right. I put my bias probe on the amp and found out one of the positions was dead, no bias current. I pulled the chassis to find a blown screen grid resistor on that tube position.
Had the resistor changed and the amp has been fine ever since.
Dom
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