Just a wild guess here, but accumulator in this case i think
means the pair of 12 volt lead acid batteries. Looks like
when the unit is on, it runs off the batteries, and when you
turn it off, the batteries charge.
As far as the amplifier it looks like a very simple complementary
symetry amplifier with no output caps.
So accumulator means batteries huh? That makes it simpler. Yeah, I guess I shouldn't have gotten all irritable.
It ain't ugly, I thin it is pretty. My amp is the ugliest! Oh man, it's threatening! Maybe we should have an ugly amp contest. (You know? Who has the ugliest amp? And, awards would be a nice looking chasis. So we can clean up our acts