So basically take off the bias?

I assume then that I can just use the tank circuit to tune it nicely?

And I might have to increase the drive by 4 times in order to get the
potential 4 times increase in output?


Sounds simple enough to me!

Sam


"Ralph Mowery" wrote in message
link.net...

"Samuel Hunt" wrote in message
...
Hi all.

I'm trying to find a good circuit for a Class C 4CX250B linear.

I've found a few for multiple valves in Class A, but I'm after just a
simple
circuit that shows a 4CX250B linear for 2m with Class C biasing.

Idea is to use it for a little project where I want to run about 100W,
but
run it cleanly without all the RF hash that transistor amps give.


Can anyone point me in the right direction?

Also, how would you go about varying the RF power output on a 4CX250B
linear
in class C? Is it by varying the 1.2kV supply voltage, which would make
sense, or is there some other recommended way?


There is not really any difference in a class A and Class C circuit. Just
adjust the screen and control grid voltage to the class of operation you
want. Should be in any of the tube manuals.