Well, got it today. Playing it through a Ampeg 810e bottom. Rolling thunder is all I can say...cause my wine glass rolled right off the edge of my desk, and onto the beige carpet.....it was a Merlot..... she's gonna kill me when she gets home. The amp. is outrageous!! It has Groove tubes, telsa and sovtek. Two of each. I have pics of the interior. Will post shortly. Massive transformer. The 10!!! yup ten MOSFET's are bolted to a "tunnel" with twin fans at one end blowing out the rear. It sucks air from the front as well as from the sides. As the pics will show when I get them up, the tubes are inline with the air flow as well. Clever layout. Now for the sound....LOUD and POWERFULL!!! Nuff said!! I have it eq'ed with bass on 8, parametric bass eq at +4 at 40 hz, all other controls set midway, (flat). No boost or cut. Ultra low and ultra high engaged. Treble control at 7. Tube voltage control at 300 volts. Compression at 0. Gain at 10 o'clock and master at 12 high. This gain setting flickers about 30%...good setting for me. The sound is HUGE...no power loss, no delay in attack...NO DISTORTION..and it's fun to watch the lights in my office dim when I hit certain low notes!! Ampeg hit this one out of the park!!! Very, VERY happy....finally!!! I also notice that the fans run at varatible speeds and are always on...the top of the amp, over the mosfets is quite warm at idle/mute. This leads me to belive a high bias is being applied to the output devices.