Mystery Amp (new to Earth Sound Research)

As an amp repairman/builder, I had thought I'd seen about every brand of amplifier in America, til last saturday when I found an Earth Sound Research amp at a swap meet. The guy sold it AND a 100-watt Laney for $5 (neither worked), so I figured it was a fairly good deal, no matter what.
Maybe someone here can tell me something about the amp I got; it has no model number on it anywhere. It's a 100-watt hybrid head with reverb. It had a couple of burned out resistors when I bought it, so a quick swap and a pot cleaning job and I have a fully functional amp. It's got plenty of power and sounds great for what it is, but I'd really like to know a little more about it.
Anyone?... Anyone?...
(by the way, I got the Laney working too... a good shopping day, in my opinion)

Mystery Amp

I'll try and help but you need to post some pictures.

have no idea how to post

have no idea how to post pictures... I can say that the circuit is exactly the same as a 70s Peavey Classic 100, except this one is a head, and the Peavey was a 2x12 combo.