Hi folks,
I'm planning out a 300B SE build, and I have some confusion about something.
I've seen some folks that recommend using two independent rectifiers for each channel so as to minimize voltage drop. Right now I'm planning a 5U4GB, and I'm estimating around 125mA per channel. Based on pen and paper calculations as well as PSUD, I gain 55V or so by running independent rectifiers, which seems like a pretty big win for the relatively minor cost of a second rectifier.
What I'm unsure about is if I'll need a separate filament winding for each rectifier, or if they can share one filament supply. Seeing as they're directly heated rectifiers, it seems like if they share a filament supply they'll be effectively paralleled, and I don't know if there's potential for undesirable interaction or "fighting" (uneven loading or whatever).
I'm planning on using an Antek toroid for this build, and I already need to buy 5V filament transformers for the rectifier as well as the 300B filament supplies, so it really just comes down to three vs four filament transformers.
Thanks,
Ian