Originally Posted by anatech
I'd leave the LM318 in there. It is blazingly fast, around 70V / uS. If you replace it with another, you may need to redo the HF compensation.
I was never impressed with these toasters. There is not enough current to charge and discharge the gate properly. The driver stage is not well designed. This amp "is what it is".
It's a fast one alright! the old BGW amps used a 318 as well, they were powerfull sounding but kind of, well, gritty sounding, which right or wrong I always blamed the 318 for that. They could also oscillate if there was flux on the board around their pins.
Any gear that old better plan on replacing all the electrolytics, I am repairing a Sony 3/4 inch U-matic VCR from the 80's right now and have found 21 (so far) bad caps.
sounds like you use the same method on burned boards that I do, cut out all the carbonized material, then place a peace of tape one the board and fill with epoxy. i have been 100% sucessfull with that method. Otherwize 0% success.