Old Pyramid pma-100 watt amp?

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Has anybody ever seen one of these before? I think i have found the hot and the ground wire (small 2 prong plug). But the remote , speaker wires , and the sound input wires im having a problem trying to figure out.
It has 4 green c45h7 PNP transistors on each corner with the middle legs clipped off and riveted to the bottom plate with no insulator pads.... Ive never seen anything like this before...

This thing has got to be from around 1979/1980's... I like that is was made in the usa by pyramid..😀 One of the first amp Pyramid ever made?

Check it out..

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Inputs: Orange+Green/Purple+Grey
Outputs: Yellow+Brown/Blue+White
B+: Red
Ground: Black
The inputs were likely intended to be driven by the speaker outputs of the stereo.
The heatsink seems a little useless?
 

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Some old amps are turned on by sensing that the head unit has been switched on. 12v goes to the amp, and then the deck power comes from a wire from the amp. There was a time when decks rarely ever had power antenna outputs.
 
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