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

[vk3pa at vk3pa.com]

Quoting Ron Youvan <ka4inm at tampabay.rr.com>:
  yes its on the pri input to  the t/former ..heater /ht on same t/former
a slow fil input will save the tube life as we all, know when a ligh  
globe is s/w on or off is when it fails..


>> 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.
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