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1) I thinks its a huge problem that you have different types of tubes on both sides- there no way the amp is properly biased. Best 6l6s for reasonable amount of dough are SED (the original winged c svetlanas) or Jan Phillips 6L6wgb- neither set of tubes should break the bank- and it would be huge improvment.
2) As for the reverb problem, check the reverb recovery tube as well as the At7 driver you already checked out. The problem may also be one of two old ceramic coupling caps in the reverb recovery section.
sometimes a good approach is to grab a couple tested ax7s and At7s and start swapping tubes until you find the problem. If that does nt help, Check the reverb driver output tranny and move on to testing caps and resistance values inside. Only proceed to this step if you are comfortable draining the charge inside the amp befoe you start poking around inside th chassis.
Hope this helps
Cheers
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