Someone meant serious business when they built THIS amp! I mean- Acrosound TO-300 outputs- and dual mono construction THROUGHOUT! Got this from a local guy here, to check out for him- I haven't gotten to trace out the circuit yet- but I'm guessing that, from the tube complement (EF86/12AX7/EL34s) that it's probably a Mullard 5-20 design. I think those are probably paper-in-oil coupling caps? This looked to almost be a "cost no object" build- the power transformers, the oil-filled power supply caps, the huge chokes (6H 200ma each), and the output transformers- this amp probably cost about as much as a good used car to build, back in the day! From the looks of it, nothing was left to chance in this amp. An adjustable-tap resistor for cathode bias adjustment, a DC balance pot, an AC balance pot, and an input gain pot, for each channel. They even used an aluminum chassis for the audio circuit parts- a great thing for fidelity (no magnetic flux leakage in the chassis). I'm looking forward to getting into this one. The owner was pondering whether to part it out (heck, the transformers themselves are pretty super-valuable), or to get it going- I'm thinking that it would be a shame to NOT see what it can do... Regards, Gordon.