Don't forget that any time you roll output tubes, the sound you hear will be largely dictated by the input tube.  That means often times you'll have to roll input tubes again.

Steve

I have kept the unit on continuously for a week now. The chassis is warm, not hot to the touch. I have the 6K6's in place with 1956 JAN Sylvania 12AT7's in front. I find I can turn the volume all the way up and it is not too loud. I think a 12AX7 in front would bring up the volume a bit. But I am almost through futzin' around with these 6K6's.