ok here are specs:
+ and - 50V max supply
idle current 50-100mA
150 watts RMS into 4 ohm 100 into 8
THD 0.01% @1Khz
15hz-40Khz
20V/uS
vin = 2.4v pk/pk for max o/p
Input is not op amp though, but its very simple to make.
Distortion is probably better in this circuit which uses doubled up MOSFETS. You will have to find modern equivalents for the MOSFETS and some of the bipolars but it shouldnt be difficult.
For guitar amplification such large supply caps wont be necessary if you want to skimp a bit, 6800uf per rail maybe?
I also have the bridge circuit schematic, and PCB layout.
The bridge can theoretically provide 650 watts RMS with 2 MOSFET modules attached.
But i cant be bothered to draw it up at moment
..............ok i cant attach a word document with a screen dump in it.
I need to make a picture out of my screen dump somehow first?
Craig