[Amps] 4CX800 Linear

[Glenn McNeil]

Hi Gang..

I'm after some advise...as are most on this reflector I suppose.

I'm building up the 4CX800 Linear featured on the Svetlana Website as Tech Bulletin Number 
42.

Part of the plate tuning requires a 70mm round disk to approach the earthy side of the plate 
line..which is an aluminium sandwhich seperated by a teflon sheet. This disk approaches the 
earthed side of the plate line, near the tube. The other end has an adjustable tap to feed 
the RF to a type N connector.

Constructing this cap relies on a good earth where the adjustable shaft passes through the 
RF Anode box to the outside world where it has a knob or such to allow tuning the anode.This 
is easier said then done..around hear, anyway.

Is there anything wrong with using a wide spaced variable cap mounted inside the anode 
compartment in the same relative postion, one side attached to the anode line and the other 
neatly earthed by the caps normal construction with spring loaded shaft etc. I have a box 
full of Polar brand ceramic body, silver plated variable caps that I have ratted out of 
various junked gear over the years, and this seems a much neater way of doing things.

If it is OK..any idea of what capacity I'm looking at ?

Any info greatly appreciated, as I sit hear wondering which way to go.

73

Glenn
VK4TZL