Originally Posted by JohnH
Were you measuring the voltages with the black probe firmly connected to the chassis?, if so, could be that the mains fuse blew for some reason, I'd investigate that if that's the case.
Just had a quick look at the Rob Robinette eyelet board layout you posted, and it appears that both the power amp ground-bus and the preamp ground-bus don't have any ground wires going to the chassis, which might be why you're getting funny voltage readings, but then-again I might be mistaken.
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