[AMPS] Henry 1KD5 Rectifier question
Sun, 28 Oct 2001 14:53:59 -0800 (PST)
--- 2 <email@example.com> wrote:
> >--- 2 <firstname.lastname@example.org> wrote:
> >> The 3-500Z is difficult to damage from excessive
> >> grid current because it
> >At ~65 watts drive I get 130ma grid, 450ma plate
> 450mA is in the non-linear region of the
> constant-current curves.
3-500Z curves are one set of curves that I do not
have. I never really intended to do much with this
tube. Can you, or anyone else for that matter, point
me to any web resources furnishing the curves? I have
found a couple of datasheets in my search, but no
> >Well.... I measured the fil. volts. You were
> >5.85V at the tube pins. And this is with THEIR
> >replacement XFMR for this unit.
> I dropped a 1KD-5's stock fil. potential by 1.0v to
> 4.8v. I accomplished
> this by using smaller gauge wire in the filament
> ckt. Teflon insulation
> is best.
I'm beginning to think about regulated DC filament
supply possibilites for my project amp(s). One of my
local 'Elmers' claimed that for 813s, it's a great
idea but one needs to periodically reverse the
polarity in such a configuration.
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