thanks Schnauzer really both of you..i will start measuring the voltage..maybe a used furman with the readout? i wasnt sure if i was thinking something weird here?? its hard with a tube amp to know . i almost couldnt tell if it could be tube related. its funny cause after posting this and playing two more shows this week it was "weird " at both places so maybe (although they were just changed and tuned up by my amp guy) one could be beat down ?????not that the voltage issue doesnt happen...
if you dont mind me hijacking my own thread

what kind of issue could this be:
loss of sustain
"tone" seems to degrade in quality after amp has been on for awhile
like i said its been retubed tuned up..sounded amazing to me then just went downhill ?? FYI its been recapped etc. very reputable amp guy..just tryin g to figure a bit on my own after all it just came from the shop..im broke
thanks sorry im all over the place on this stuff