[DaveWM]

starting with a sub of the Burst amp tube a 6EW6...

so far looking pretty good, although the tint range has shifted to the green (good face tone, but cant shift to the purple and green is too green on tint control).
A 1/4 turn of A17 (burst phase detector transformer) got the face tones centered and good tint range.

Update: after watching for over an hour did not see the problem again. will keep monitoring it, esp those high saturation commercials. I did test the 6EW6 that was replaced and it did have shorts on both pin 1 and 2 (confirmed to nos tube that had no shorts). The pin 1 was a very mild short the pin 2 was more solid.