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I would guess the DC inputs make it DC coupled whereas the AC inputs have a brickwall somewhere above DC, like 10-15hZ or so.

“Medium-well” I’d say.

Many, many connections!

Not the modern ones… but this did work well in my friends ‘68 barracuda.

Should be able to reliably weld thin sheet metal.

700 watts in 1973 was a pretty serious amp. Was it for a movie theater?

Since it presumably worked after it left the factory, I always replace with the same value as on the board. Your friend is right- mistakes happen- but revisions also happen, that may be in a newer schematic or never documented. Regardless, I always go up on voltage beyond both schematic and...

Be kind. Rewind.

I presume it charges the batteries when “off” and disconnects the a/c line when “on”. And under-volted op amps sound poor… Wyn’s phono pre toyed with running on 9V batteries but there was no sonic or measurable difference. Despite this I put my power supply external.