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I would suspect the 6GU7's as well. I recently swapped out a 12BY7 because of one problem, and come to find out, the new tube gave me a new problem. After suspecting everything other than the new tube (and replacing many parts that really didn't need it), I went back and plugged in a used 12by7 from my "pulls grab bag" and the used tube worked perfectly! Believe me, after all those hours of looking at other possibilities, I was quite annoyed to find the new tube was just as bad as the old one.
I was also getting the green screen on my 15... turned out to be a 6GU7 that was having trouble making good contact in the socket.
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Charlie Trahan
He who dies with the most toys still dies.
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