AW: [sdiy] JRC4558D, LM13600/13700 Questions

[Nils Pipenbrinck]

> Steven wrote:
> I've recently acquired 4 JRC4558D ICs from an old AIWA tape deck and was
> wondering if these were useful for any synth diy projects that may be
> lurking on the net.


These do a good job as general purpose audio opamps. IIRC it's a bipolar low
noise opamp design.

The guitar stompbox guys get nuts when they see old JRC4558 parts. It was
once used in the legendary tube screamer guitar distortion stompbox, and
there is a trend to retrofit new stompboxes with the old opamps to make them
sound like the old ones.

(I must grant that I tried that. I wasn't able to hear *any* difference
between a JRC4558 and NJM4558, but I'm also don't put my cd's in the fridge
before listening to them).

Maybe you can sell them on ebay for a *cough* fair price. Offer them in the
guitar section and tell everyone that's the original vintage tubescreamer
chip.

  Nils