I have a PS Engineering PM501 intercom that was pulled for an upgrade and has been sitting on the shelf for a number of years. At the time the intercom was removed it worked fine.
Only issue I see with it is the sticker used to identify the knob functions is worn around the volume knob. The install manual is available on PS engineering's web site. Included is the harness that was used with it (sorry no headphone/microphone jacks).
asking $75 + shipping (or pickup is fine...based at MMU in NJ)
Jeff
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