JRC4558D

[R@F]

Hey there!!

Be careful! It is said that even newer 4558's labeled NJM4558 sound
different. They're still from the same manufacturer but JRC was later
renamed to New Japan Radio (NJR) and they use the prefix "NJM" for their
opamps now. I guess the same goes for the 4558's from other manufacturers
like NEC's µPC4558. Anyways I believe the difference in sound is very
subtile.

greets
R at F


----- Original Message -----
From: Tim Curtis <vampope at swbell.net>
To: DIY <synth-diy at node12b53.a2000.nl>
Sent: Wednesday, April 26, 2000 2:05 PM
Subject: JRC4558D


> Hi Everyone -
>
> I know that this is a little off-topic, but a friend and I have been
> playing around with a couple of old Ibanez Tube Screamers.  It turns out
> that one of them is a reissue that uses a different Op Amp than the
> original.
>
> According to several sources on the web, the original chip is a
> JRC4558D.  I find it hard to believe that the difference in tone is that
> great, but I could easily be wrong.  I'd like to replace this one with
> the original chip.
>
> Does anyone have some of these around?
>
> Thanks,
>
>
> Tim
>
>