Why all these JC-1's for sale?

If so, they don't know what they're doing when they check them. I had to return one amp recently because it ran significantly hotter than the other--new, straight out of the box.
I still have them as a back-up. The hard-sell on these amps is absurd; they're excellent value for the price, no more than that. The idea that they can trounce amps much above their price range is laughable.

Audioeng, i bet guys at Parasound are very happy about your mods?!

I have not spoken with Richard since I modded them. He's a good egg. I doubt if he cares much. Besides, if it sells more amps, then it's good for him too.

Bob - you should come to my room at THE Show next Jan. and hear them. You will not believe how good they are...You and Curl did 95% of the work and I only had to do the last 5%, so you guys get most of the credit for this.

Audioengr:

If you can run these amps off of a single 20 amp line and aren't encountering any problems with them, you're obviously not driving them very hard. That could be due to having very efficient speakers, high impedance spekars, a small listening room, low average listening levels, etc...

In order to put out power, it takes power to operate. This is NOT a "high efficiency" switching amp and it is biased quite high, so low current draw is not a strong point of these amps. They are "thirsty" amps due to their higher bias levels. By their very design, "thirsty" amps will generate a lot of heat. My "high bias" amps idle at about 130* F at the heatsink with the air conditioning on. If i left them on without the air in the middle of the summer, they would be up around 140* - 150* or so.

On top of all of that, if your "bias adjustments" are lowering the temperature of the amplifier at idle, you've simply reduced the amount of power available from the amp while remaining in Class A mode. This assumes that there isn't multiple bias adjustments for the output stage and that there is a mismatch between those adjustments. This would also account for your lower current draw from the wall as reducing the bias levels reduces current draw and increases amplifier efficiency, but it does so at the expense of linearity and sonics. In effect, it sounds as if you're defeating the design principles of the amp. Sean
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Sean - the draw from the wall should be only steady-state current. If the amp is working correctly then the transients should be supplied by the internal storage capacitance. These transients are what is quite loud. I have experienced no compression at all, but I dont listen at 110 dBA either. Sometimes I do listen at live volume levels, to my wifes dismay, and the 20 amp circuit seems to be fine. I wired it with about 10 foot of 10 gauge wire from the sub-panel to the outlets. I of course use my own power cables.