Sorry Elephas, one more story that might make you feel better...
So the Zana Deux has those damper diodes in the back that take care of rectification. Well those damper diodes have plate caps, little pieces of wire that go from the top of the tube into little sockets in the chassis which is part of their normal operation.
Craig tells me about this guy who complained to him that the amp was running with the tubes showing their lighted filaments, but there was no sound. Also, the guy complained that when he touched the top of the tubes, he got a little shock.
Craig realized that he didn't even have the plate caps on top, but also figured out that the owner threw away those "little pieces" as he didn't think they were important.
har har.