Re: 4-1000A Screen Biasing...

["Daniel Boughton" <daniel_boughton-at-yahoo-dot-com> (by way of Terry Fritz <twftesla-at-uswest-dot-net>)]

Ray:

Thanks for the info. That's a great suggestion and a
much easier fix!

Dan
--- Tesla list <tesla-at-pupman-dot-com> wrote:
> Original poster: "Ray von Postel"
> <vonpostel-at-prodigy-dot-net> 
> 
> Dan :
>     Normal practice for large tetrodes is to use a
> separate screen
> supply.  If you are operating the 4-1000A in the
> usual oscillator
> circuits for a VTC then your best bet is to  build a
> separate screen
> supply although I have seen some circuits where the
> screen was tied
> directly to the plate through a resistor.  This can
> be very hard on
> tubes!
> 
> Ray
> 
> Tesla list wrote:
> 
> > Original poster: "Daniel Boughton"
> <daniel_boughton-at-yahoo-dot-com>
> >
> > All:
> >
> > I have two 4-1000A tetrodes which I am using for a
> > VTC. Does anyone have experience biasing the
> screen
> > relative to the plate? The 2000 ARRL handbook
> lists
> > typical screen current to be 146 mA for class CT
> > operation and 145 mA for class CP operation(not
> much
> 
> 
> 


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