01-07-2024, 02:36 AM
As far as I can remember the main differences between these power output tubes is that some are beam power and some are power pentodes, but 1T5, 1C5, 1A5, and 1Q5 will all work in place of one another, and on an AC powered battery eliminator it does not matter. As for the output transformer I would pull one from a junker battery set using similar tubes, it doesn't have to be a Philco.
Regards
Arran
Regards
Arran