Re: 4-1000A Screen Biasing...

["Ray von Postel" <vonpostel-at-prodigy-dot-net> (by way of Terry Fritz <twftesla-at-uswest-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