PEAVEY BANDIT _ What is a "4558" ?
Colin Barnes
I was skimming through the letters page of issue 2 of the "Monitor"
magazine and came across a note from someone who had replaced the 4558s
on a ten year old Bandit 65 and found that the sound improved (O.K.,
O.K., I know someone is going to say it could not get much worse!).
Anyway, what are 4558s? I have to admit the Bandit I use is very
reliable and has nice equalisation and enough headroom so that, for a
stage monitor, it works well to cut through all the other sound on
stage. Is it worth swapping 4558s (whatever these little blighters are)?
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>
>Anyway, what are 4558s? I have to admit the Bandit I use is very
>reliable and has nice equalisation and enough headroom so that, for a
>stage monitor, it works well to cut through all the other sound on
>stage. Is it worth swapping 4558s (whatever these little blighters are)?
A 4558 is an Op-Amp. Look for an 8 pin IC.. I guess some of the more modern
ones might have a better slew rate than the original.. I have heard stories like
this also.. I have never seen a Peavey skem, but I would imagine they use the
4558's in the pre-amp stages and overdrive them for thier "saturation" effect..
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Dr Distortion
Colin,
4558s are "jellybean" (cheap and common) dual op amps that are used in
many consumer products, including guitar amps. They are pin-compatible
with many other duals such as TL072, TL082, etc. I often replace failed
4558s with TL072s because the 072s are quieter. The different duals
are not :exactly: the same in all respects (slew rate, type of input,
current sourcing capability and so on); but you can usually sub one for
the other in typical guitar amp circuits.
By the way, I was puzzled by all the posts about the alleged
scarcity of JRC4558s. Just open any mailorder electronics
catalog! :) At my shop, we buy and use them by the fistful.