Hmmm... never heard of that.. they did make a GM-h50, 100, 120 and 200... but never a 300... was it a 2 channel or 4 channel? </font>[/quote]It could be a GM-3000 which was a 4channel amp.

As for the GM-H50 - one of the best Pioneer amps ever made! Used to do 1ohm loads with those things ALL the time. [img]graemlins/headbang.gif[/img]

My oldest gear is only from the late 80s [img]graemlins/dunno.gif[/img] EXCEPT for a single 6x9 'Add-On' speaker meant to add to the rear dash of a car. It's brand new in the box from the 60s and comes with wiring, screws, and a fader [img]graemlins/thumb.gif[/img]