LF411 Op-Amp dilemma

[Brendan Heading]

brad sanders was saying:


>Don't use the 3140. You should have ZERO problem finding TL081s.
>(TI also has a "new and improved" version, called a TL7081- or
>something like this; consult their web page for details.) A TL081 has
>lower noise than an LF411, equally good input characteristics, unity
>gain stable, decent output drive, blah blah blah. An AD711 would be
>even better - but really only in the S/H and directly in the audio
>path.

This is interesting. Not something I'm experienced in, but my ARP Quartet is
literally chock-full of 1458's. In the overused "Vintage Synthesizers", a
chap mentions how he cleans out all 741s in the ARP 2600 and replaces 'em
with the LF4xx equivalent.

My question is - is this TL081 a direct drop in replacement for a 1458 ? Will
putting one in effect the sound in a bad way ? There are 11 of 'em in the
Quartet - 3 of these seem to be used for altering the sound in some way
(apologies for the lack of detail here). If I can clean this thing up and
start modding it, the best thing prolly is to fix up the crap chips inside :)

Also, one other point. I'm thinking of sticking a CV/gate socket on it, but
the Quartet is fully polyphonic - I think one of those top-octave divide down
jobbies. What sort of signal does this thing output when a chord is pressed ?

Thanx.
--
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