Elevating filaments from bias tap

knuckleberryfinn

Sorry people, another question as I try to build up this bastardized Bassman.  I have read on the trusty internet that elevating the filament supply by referencing to between 30 and 70VDC helps reduce hum.  So I am wondering if I can split the AC bias supply into two, with two diodes facing different ways, producing +50 and -50.  Well, I know I can.  But what I want to know is do I need a filter cap in there to ground too?  Or can I just go from the +50VDC to the wiper of my humdinger?  Hmmm, the wiper of my humdinger - sounds a bit sexy.

Misterg

You'd need a smoothing capacitor. Personally, I'd generate the elevation voltage using a potential divider from one of the HT supply (B+) nodes (also with a small smoothing capacitor).

ICBM

I would wait and see whether it hums first, personally. Don't make things more complicated than you need to.