[Paul Stamler]

"Eeyore" wrote in message
...
I don't know what opamp Jim Williams substitutes for the 301 in that
modification, but I bet the choice was non-trivial..

I doubt it. Not with the modern devices to hand.

That's talk. Jim actually works on the mics. Give it a go and see what
you find.

How much do you know about MODERN semiconductor devices and ICs ?

Most of this stuff is TRIVIALLY SIMPLE now.

The idea that it's some difficult task to find a better device then an
LM301
simply shows that the person suggesting such an idea is DECADES out of
date with
modern practice.

Not necessarily. An IC going into a microphone running from phantom has to
be low-current *and* low-noise *and* low-distortion, and (if it's driving
the output and the output is transformerless) has to be able to operate
cleanly into a 600-ohm load. Depending on the surrounding circuitry, input
bias current may be an issue, or not. Getting two or three of those right
is, as Eeyore suggests, not that hard with some perusing of catalogs and
bench testing. Getting all of them right, well, that might be a little
tricky. It's the requirement for low current that buggers up the situation.

Peace,
Paul