ppl- is there any advantage in cascoding the current Source FET like you advocate for biasing opamps into class A? If so, could you possibly post a schematic. Many thanks Gopher

I was thinking of having two headphone amps within one box. One for classical/jazz and one for pop/rock. Anybody got suggestions for the best sounding op-amp/buffer combo for each type of music or is that a stupid question? thegopher

I've seen the two resistors which set the output voltage on adjustable regs replaced by a diode and current source. What's the skinny on that? Can anyone post a schematic and/or suggest part numbers?

ppl- Are there any limits on input and output capacitance for stability with this method and are LDO regs like the LT1085/1033 more susceptible to stability problems with high values of output C than the LM317/337 types?

Anybody got any ideas to tweak 3 pin regulators to the max, other than those covered by data sheets?

The amp will be mains powered so there's no quiescent current issues

As a new member I'd like to get opinions on the best sounding opamp/buffer combination for driving HD600 phones. Thanks thegopher