Help with power transformer for guitar amplifier!

[ZebraShaSha]

@mikews99

Looks like it’s a specialty transformer. The LM1875 output power IC has a maximum of 60V allowed on its rails (±30V), so you need a 42V 2A center tap power transformer to supply the LM1875. Then for the 12AX7, you need a 150VAC output plus a 12V filament supply. You could cheat by connecting the 12VAC secondary of a 110VAC/12VAC filament transformer to the secondary of a 220VAC/18VAC transformer, giving you approximately 150VAC from the primary. You would need to find room for three transformers, but that’s probably an easier problem to solve than trying to find a 110VAC/150VAC,42VAC,12VAC specialty transformer.

Oh, I think I get it now! Essentially it’s a solid state amp with a tube preamp built in. So, in theory, I could just get a power transformer they use for LM1875 builds and a transformer they build for 12ax7s, right? Would I have to deal with any interference issues with two transformers?

ETA: Thanks so much cornflakes!