>
> One of my modules is the 410 tripple filter which includes some 4558 op-
> amps in the design.The 4558 is more or less a twin 741 which is not the best
> audio opamp. It says in the manual that these were there in the original Korg
> design and thats why these quite old opamps are used. I dont now the
> original Korg 3100 sound and there is nothing wrong with vintage design but
> has anyone tried to use never "better" opamps. TL072 should replace with no
> problems I assume.
Certainly the TL072 is "better" but the 4558 has a distinct sound to them which
is why they are used.
In fact, if you look at all the world's "audio stuff" built from 1985 to 1995,
the 4558 was king!
Paul S>