Audio Op-Amps

[Sean Costello]

BJ wrote:
> 
> Paul Schreiber wrote:
> 
> > Lastly, there is another bipolar dual op amp called a RC4558 that JRC made.
> > Used EXTENSIVELY in early
> > Yamaha synths, mixers, cd players, and car stereos. Not a bad part, was
> > about 1/2 the price of the TL07x
> > in 1984. Makes a difference: JRC rep told me Yamaha used 125,000 a WEEK!
> 
> Yes thats interesting, the japanese manufacturers seems to be wery found
> of the
> 4558, its used in a lot of old Korgs and some Roland synths too!

The JRC 4558 is supposedly the "secret ingredient" of the Ibanez TS-808
and TS-9 Tube Screamers.  Other 4558 chips apparently don't sound nearly
as good in those circuits.  

Sean Costello (who prefers the subtly world-rending sound of the Super
Fuzz to the wimply buzz of a Tube Screamer, although the TS-9 can sound
nice in front of an old Fender amp)