"Stewart Pinkerton" wrote in message
...
: On Wed, 22 Mar 2006 18:56:06 +0100, "Ruud Broens"
: wrote:
:
: an OPA2604, with distortion cancelling cicruitry build in,
: needs a *thousand* times more feedback to be even a
: half decent match for a handfull of hybrid tube-SS parts.
:
: Actually, given the amount of feedback for which that opamp was
: designed to be used, i.e. using it correctly, it is not a 'half-decent
: match', it utterly *obliterates* anything you can concoct with tubes.
:
: Show me the hybrid circuit which can combine a gain of 30, a bandwidth
: of 500kHz, and distortion of less than 0.01% across the audio band.
:
: What's wrong with feedback? Just because the phase stability of tubes
: is so poor that you *can't* use much feedback, doesn't make it a bad
: thing per se. It's called progress, Rudy.
:
: --
:
: Stewart Pinkerton | Music is Art - Audio is Engineering

been there, done that
yawn

Rudy