[winkenstein]

that is not a PPI Amp.
it looks like an old urban audio amp [i think that was the brand name
anyway]
it is direct from the car audio section at your local Wally-World super
center.
definetally nothing very special,
it looks exactly like the one i used to have about 15 years ago?
it was purple in color when i first obtained it,
but then i scraped all the paint off of it,
and what you see now is what it looked liked underneath the painted
surface,
someone just put a PPI sticker on it,
to try and be cool?
i am sorry to say!

i think it was (/me digging deep into my memory vault), supposed to be
rated for 400 watts!
total output. (YEAH RIGHT!)
but more realistically it in no way could of been delivering any more
than 50 watts per channel? (if even).

but hey!
it was a decent amp back when i was in high school,
and was living on mom and dads money.
it survived for quite a while if i recollect properly.

terriblely sorry to disapoint you,
i hope you wheren't placing any bets on it's E-Bay value.
as being an authentic one of a kind rare PPI amplifier or anything.