darkfenriz said:-small resitor on q1/2 emitters would be a voltage devider to prevent next stage from working in class (a)b
ilimzn said:Your pot is wired wrong on the schematic, as it is shorting the output of the OPamp, wich will only start reducing the output from it when it starts clipping because it's overcurrent protection is activated. If you really need to use such a volume control, connect it after R35.
I can se you have read some of my musings on pairing HEXFETs originally designed for switching applications, and use a IRFP240 and 9140. However, with the source resistors 0.22 ohm, you will still run into bias current runaway unless bias is quite high (on the order of 300-500mA or more), so you may want to look into using a Vgs multiplier somewhere. With HEXFET, you would need quite large source resistances (ohms) to get them stable at low bias, which would at the very least waste a lot of power.
Regarding the other simple amp, the power supply generator for the OPamp seems a bit problematic to me, maybe a connection missing somewhere - the picture is fuzzy. You may want to try reducing to 16 colors and posting as GIF without reduction in size.