O.K., So I verified that I did indeed have the 4 and 16 ohm taps wired backwards. I'm good now and verified. BUT... I'm using a bastardized set of tubes as I don't have a coplete factory matched set. I have three winged c's and a svetlana and JJ I swap out. I got a little nervous about the JJ's pins the tubes a biased like this with 490 volts on the plates v4..... v5...v6. v7 31ma 30.7 28 32 (JJ) ...................27 (svet) ....So , I turned out the light so I could really look at what's going on. playing through a 16 ohm THD hotplate (it's 5.a.m.) into a 16ohm cab.... v4 and v5 seem to be pulsating to the music, v6 not at all v7 is a bit. When I dime the amp and really start playing, the plates on v4,v5 and v7 start to glow a nice red/orange. The more I play the more they glow. When I stop, it fades. What is this all about??