Re: Sad day.
What is the amp itself worth in normal condition? A new transformer alone can be $150-$300 depending on the amp/where you get the replacement from. If it's a hand wired amp, a decently knowledgeable hobbyist that's had experience with DIY repairs before should be capable of a transformer swap. If that's you, you won't have to pay for labor/shipping/etc. It'll probably just take a few hours of free time. Also, if the output transformer went and there was a proper load - you'll have to check to see what could've caused the old one to go, or you may just keep on burning up whatever new transformer gets swapped in there. First place I'd look is the power amp section after the power supply, and before the OT (duh) - so mainly the part of the circuit involving the power tubes. Faulty wiring here can wreck thing pretty fast. Also, check to see if any of the power valves have a short - because that's an easy thing to test/rule out. A short across the power valves should blow the mains fuse and a couple of specific resistors which would prevent further damage, but if none of those blow, a power valve with a short could damage an OT. If it's a 6L6 amp, the valve filaments are on valve pins 2 & 7, and there should be continuity on them. If there's resistance or infinite resistance across those pins, you have a faulty power valve.
