Update. My Jeff Rowland now runs a LOT cooler after its service by Jeff. The upgrades and repairs have resulted in not only a better sounding amp, but in this case...a cooler running one too. When I look at some of the tube amps that are currently on the market...like the big Carver's and others that use upwards of sixteen or more tubes per channel, I just shake my head in amazement! The heat these beasts give off must be almost intolerable after a short period.