[Amps] filament transformers

[Paul Decker]

Hi everyone, 



I just wanted to thank everyone for their replies.   It seems the 14 or 15 Volt version at 3A will work.   Actually, what I took away from the discussion is it's not a big deal as long as the voltage is set right and the transformer can supply the current. 



Lots of discussion on rewinding my own.   the only problem I can see from that is "modern technology"   Almost all of my junk box comes from recent disassembles .   most of the power supplies are switch mode rather than linear, so the days of big linear transformers declining, at least in my stash. 



One suggestion was to use a microwave transformer as the base and rewind secondaries as required.   I do actually have a microwave transformer that I'm saving for just that purpose, but for a different project. 



BTW, I did wind my HV transformer for this amp but wasn't brave enough to attempt to add the filament winding at the same time.   



in the end I'll probably go with a 14 V  4A transformer.    Pics of the amp build should be starting to show up once  I get some sheet metal, hopefully this week. 



Thanks again, 



Paul, kg7hf