The Catch-22 of Negative Feedback aka NFB
"Bret Ludwig" wrote in message
oups.com...
Ruud Broens wrote:
snip
The opamp is *designed* to use large amounts of linearising
: feedback, something that simply isn't an option with the inherently
: much lower open-loop gain of tubes.
Philbrick and Julie were building perfectly proper op amps with tubes
as early as 1943, but thanks for playing.
Part of my theory training was the K2-W :-)
Mike
|