I had one of those amps once. A proud member of head-fail and the any octal tube, any octal socket group plugged the totally wrong tube into the hole where the (whatever the non-pin compatable power tube with a top cap is) goes and blowed it up. "but it was an octal tube."
I fixed it (totally destroyed cathode resistors for the output tubes) and donated it to a head-fi meet a few years back.
If you are asking what to do, instead of reading the markings on the transformer and finding a suitable replacement yourself, would suggest taking a large hammer and smashing it up.