[Amps] Step-start and 3-500Z filament life

[Ron Youvan]

> I understand why turning a tube's filaments off and on repeatedly
> shortens the tube's useful life. However, I'm not clear about the
> effects of doing this when a step-start circuit is included (as in
> the Harbaugh step-start kit, which I have installed in my
> 6m-converted SB-220).

   I think of "step-start" as applying to the plate supply, to minimize the initial capacitor 
charging current and preventing a hV over shoot, and inrush limiting to be applied to initial 
filament heating, does the Harbaugh step-start kit effect both?
-- 
    Ron  KA4INM - The only real problem is death is so final.