Hi Joe,
I am not sure about the 6c45pi tube. Maybe, Ecclectique is the right person to ask.
According to my book, the variants for the 6c4 tubes are:
6c4w, 6c4wa, 6100, 6135(for parallel filament cicuits),EC90, L77, M8080, QA2401, and QL77. No mention of the 6c45pi tubes.
BTW, I know your Teres. IMHO, you did a very fine job.
cheers...