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Filament help!



Original poster: "Jim Mitchell" <Wrenchead-at-starband-dot-net> 

I'm using a 4-125A in my VTTC, and I cant find a filament supply!  I was
thinking of using a PC PSU but they have too many wires and I don't know
which ones to cross for power on, and which to load to keep regulation
proper.  The 4-125A needs 5v at 6.5A for the filament.  Also, any idea if
thise tube is better than the 813? I have both and am wondering which I
should use.