John Woodgate wrote:

I read in sci.electronics.design that Pooh Bear
wrote (in
) about 'Reducing hiss by changing
op-amps ?', on Tue, 22 Mar 2005:

The 072's not really that quiet by modern standards, John.

Of course, but it's better than the 4558. And you aren't in favour of
going to extremes:

Nope. Not necessary.


QUOTE
If you want to experiment a bit, you might get a few LT1124CN8 dual
opamps to try as replacements for the 4558 types. They have make
about half the noise of the 4558.

NE5532s will do the job for a fraction of the price of the Linear
Technology part. Indeed, if you're having noise problems using 5532s -
something is seriously adrift !

It was my suggestion to use 5532s. If just about every serious modern audio
mixer manufacturer can realise *very* good noise figures using them ( or
4580s ) - why use esoteric devices ?


ENDQUOTE

I get the impression that you always want the last word. If so, go play
with Brasfield.

Not interested.

I *do* know my stuff regarding audio however. Around 30 yrs of experience
of designing practical circuits used in real products.


Graham