[ARC5] [Milsurplus] Screen Bias in ARC-5 Transmitters

[Kenneth G. Gordon]

On 25 Oct 2013 at 16:38, J. Forster wrote:

> Ooops. I see what you mean.
> 
> If you look at the prints, the 4 screens (2 in Mod; 2 in Tx)are pulled
> to the plate, at 550 VDC, through the roughly 15k, R-89, so the screen
> voltage depends on the screen current.

Oh yes! :-)

In SOME circuits, it is actually best to take the screen voltage from the plate 
supply through a dropping resistor: in others, it is best to use a separate 
screen supply. Personally, I like to take my screen voltage from a separate 
supply...almost all of the time. One has better control over it.

Ken W7EKB