That's good to know, then. I still need to get a hold of Jeff Rossel and see what tubes I actually have. The wiring differences are my final concern for this issue. I'm wishing there were an easier way to tell (which tubes I actually have).
Yes, I have an EZ81, as well as the 370DAX, so I should be good to go for a power supply.
You should be fine on the power supply front.
The ECC99 is a modern tube from JJ. It would have a big red JJ logo on it. It's based on the 6n6p, but has higher plate resistance.
If there's no JJ logo, it's probably 6n6p-i or 6n6p-ev, and the only difference there is the heater current iirc. My heater supply is doing just fine with a pair of 6n6p-i at almost an amp each and a pair of 6n1p at 600ma each along with the EZ81.
6h30-pi was a premium option and i doubt glassjar ever sold any. You would have noticed at $30/tube.
Your preamp tubes should be clearly marked too, but i don't recall any wiring differences between 6dj8, 6922, 6n1p, or 6n23p -- the 6n23p being the real 6922 clone from russia. CEI even sold them labeled as 6DJ8. The 6n1p just has slightly lower gm and a much hotter filament.