Anyway, per Billy's advice I decided to toss one in the PI slot of the DSL I've been working on. After replacing a few blown resistors I changed the PI tube at the same time.
Turn it on, and .... whisper quiet volume almost like it was when I bought it (cheap DOA project).
Got pissed thinking I blew another heater resistor, but it ended up just being a dead preamp tube

Tossed in the Mullard that came with it, and all is good. Then said screw it and installed a choke that I found for $8 on Reverb.



I'm going to try very hard to not flip this amp. It just oozes solid rock tone. Oddly enough I'm liking this with Mesa V30s.