Do not connect a speaker or load until you are sure the amp is not making DC on the output. The 330 ohm resistor gets hot probably because the zener diode it serves has shorted. Check D12. And that would drag down the -50. Plus it means the -16 is missing.
If -16 is missing, that means the op amps, particularly the one in the power amp, are running on +16 and zero rather than +15 and -15. It will try to work, but it will center on +8v rather than zero volts. And that will throw the whole amp that far positive.
Unfortunately you tried to adjust it out. There is only one trim pot on this board as far as I know, and it is NOT a DC offset. If you have a later revision that includes on, so be it, but that is un-crate like. That control is the bias control, and you may well have baked the MOSFETs by turning the bias too far.
So check those things and tell me if I am onto something of if I have missed the boat.
And look up "light bulb limiter" and make one and use it.