i cannot see where it is bad. the insulation on the wire would be kind of crispy/flaked/cracked. if you are seeing bubbles, like soap bubbles almost, that would be the enamel, or whatever they used to lock all the wires in place. i would have to look real close at it, and measure. that would definitely cause the power supply failure, though. on the other-hand, it could also be low voltage/clipping, or output failure that caused it. those 3 diodes are likely smoked and could be good. if they are not good, then the amp was hooked up backwards, which could also damage the power supply if the fuse does not react in time. all i see in the toroid, is 2 multi-strand primaries (gold and red to differentiate) and the secondary maroon wrapped over them.n if there is a problem with the toroid, then it is more likely cheaper to buy a new one than the labor to re-wind it, not to mention if the core has lost inductance. bottom line- the power supply is bad, and it needs to be gone through and tested to see how much is really damaged. still not taking on repairs for anyone atm. i already have 2 amps that i have been trying like heck to find the time to finish, and then a 3rd for a friend, who dropped solder through the grid and shorted a pair of fets (caught fire) a few months from now might be possible.
