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The PM-175 seems to be uncommon these days. I don't know how popular they were when they were being made back in the mid-'80's.
I haven't seen what they look like inside, I'm sure we would all appreciate any pics you could post!
I haven't been able to find a service manual or schematic, but *think* the PM-175 was a "one flat board" amp. Pretty sure it's a Mag Field amp, with two rails for the output stage. Possibly the pro version of the equally-rare M-0.5t?
The PM-175 was rated 175 Watts per channel into 8 ohms, stereo. It was also bridgeable in series mono with a switch (common ground outputs). Non-inverting in stereo mode.
As were most amps of that era, the XLR's are factory wired for pin 2 *cold* (-), although many were subsequently changed to the modern standard of pin 2 hot. The TRS jacks are conventionally wired and parallel the XLR's (easy to jumper for dual mono or daisy chain).
There's a provision on the back for changeable modules, such as crossovers. Might want to see if it's got something special plugged in there!
Spares/projects: C-1, C-9, M-400, PM-350(x2), M-1.5t, PT-1800(x4), TGP I, Architectural True Sub, pm420
Don't call amp mutilators "butchers"- butchers are highly skilled professionals.
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