Keeley PSI

Info about the original:
We set out to take a classic design with lots of history  and make it
obviously something new.

We took the op-amp version of old PI and
inverted one of the stages, brought out the midrange, tightened the
bass, and most importantly, added a Germanium transistor output!

Yes,
this is a opamp-transistor hybrid.  Don’t be miffed by op-amps in your
pie folks, the germanium touch at the end makes everyone smile around
the shop here.

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