17 Apr
2008
17 Apr
'08
2:59 a.m.
Date: Wed, 16 Apr 2008 11:33:41 -0800
From: Brent Hilpert
What's the app?, does it really have special
requirements? So many op-amp
types have been produced over the years. Perhaps I exagerrate, but they
seem like transistors in that a dozen modern types could cover
substitution for the entire range of types.
The audio folks get very picky about brands of op-amps and swear
there are audible differences between brands of the same op-amp.
My response to those who say "just listen, you can tell" is usually
"What?"
Cheers,
Chuck
17 Apr
17 Apr
3:25 a.m.
On Wed, 2008-04-16 at 23:59 -0700, Chuck Guzis wrote:
Think this is more a discussion for roys-tech-chat.
My 2p worth, though, is that you can only tell the audible differences
in opamps when you push them into clipping. Then it becomes really
noticeable. Other than that, some opamps are really noisy, which you
can hear, and some have poor slew rates when used in marginal designs
which can cause weirdness with high frequencies.
Gordon
Date: Wed, 16
Apr 2008 11:33:41 -0800
From: Brent Hilpert
What's the app?, does it really have special
requirements? So many op-amp
types have been produced over the years. Perhaps I exagerrate, but they
seem like transistors in that a dozen modern types could cover
substitution for the entire range of types.
The audio folks get very picky about brands of op-amps and swear
there are audible differences between brands of the same op-amp.
My response to those who say "just listen, you can tell" is usually
"What?" 
4:52 a.m.
Chuck Guzis wrote:
how did I do that? --> exaggerate
I didn't know they had condescended to tolerate op-amps in the signal path, or
do they use them as the error amps in regulators for tube filaments?
Date: Wed, 16 Apr 2008 11:33:41 -0800
From: Brent Hilpert
> What's the app?, does it really have special requirements? So many op-amp
> types have been produced over the years. Perhaps I exagerrate, but they seem like
transistors in that a dozen modern types could cover
substitution for the entire range of types.
The audio folks get very picky about brands of op-amps and swear
there are audible differences between brands of the same op-amp.
My response to those who say "just listen, you can tell" is usually
"What?" 
11:05 p.m.
Brent Hilpert wrote:
I didn't know they had condescended to tolerate
op-amps in the signal path, or
do they use them as the error amps in regulators for tube filaments?
In my case, a good op amp in my CD player, Simple RC filtering for my filaments.
I beleve in less feedback the better.
11:01 p.m.
Chuck Guzis wrote:
I think it more of the case 10 cents for the cheap part,
$1.00 for the real part.
Guess where the $proft$ goes ... Bean Counters.
Date: Wed, 16
Apr 2008 11:33:41 -0800
From: Brent Hilpert
What's the app?, does it really have special
requirements? So many op-amp
types have been produced over the years. Perhaps I exagerrate, but they
seem like transistors in that a dozen modern types could cover
substitution for the entire range of types.
The audio folks get very picky about brands of op-amps and swear
there are audible differences between brands of the same op-amp.
My response to those who say "just listen, you can tell" is usually
"What?" Cheers,
Chuck
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