[Amps] filament supply options

[R.Measures]

On Apr 25, 2004, at 6:53 AM, Steven Grant, W4IIV wrote:

> thanks for the tip...your correct...wouldnt using DC cause a bias 
> condition that may cause linearity problems?.......steven

  My guess is probably.  5v bias shift make a considerable difference 
in anode current for a high-Mu triode.
cheerz, Steve
>
> "R. Measures" <r at somis.org> wrote:
>
>  On Apr 24, 2004, at 10:45 AM, Steven Grant, W4IIV wrote:
>
> > Hi steve
> > the voltage shoud be 4.8 volts for maximum tube life. 5 volts or more
>  > will cut tube life with very little benifit.
> > the reason AC is used has to do with biasing, 5 volts DC with this
>  > tube will affect biasing (in many amps, 5 volts is what they use to
> > bias the tube to cut off)
>
> ð Steve : 25v will typically bias a 3-500Z to cutoff. 5v is typical
>  operate bias.
>
> > ...
> >
> Richard L. Measures, AG6K, 805.386.3734. www.somis.org
>
>
> STEVEN GRANT W4IIV
>
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Richard L. Measures, AG6K, 805.386.3734.  www.somis.org