Actually this is more in the way of a conversion project.

What we have is a 500 watt HF plasma chamber R.F. source.
The P.A. section uses the venerable 4CX-250B tube.

Find the specs. for the tube here in PDF.

A look at the RF section of the plasma unit.





The clip seen floating at the right, is the plate connection
for the 4CX-250B tube seen below.




The R.F. output section is contained and separated by the
vertical divider plate, your standard Pi-network.


The Chamber unit matching network.





Front of the match unit cabinet.
There is plenty of room inside once you
remove the UN-necessary parts!







This box actually has a lot of empty space in it
once you remove the hoses and other components that
won't be needed to get us to 500 KC.





Which leaves us plenty of room for the pi-net and
low-pass filter at 500 KC.





This unit comes with all the necessary voltages for the rig,
in the power supply section. So we get 500 watts
input and approximately 410 watts output!




Filament supply, lamp supply. Also contains the HV plate
screen and bias supplies.




Included are over voltage and over current circuits,
time delay circuits for the filament voltage to come up
and overload circuits to keep the tube safe.




The HV section uses a FWB to get adequate high voltage for
the 500 watt input ratings of the tube.





With oil filled HV caps for the filter, and a choke.
Note the time delay tube, for the filament
warmup time.









The Oscillator board will need a crystal change
and an RF output coil/cap change.
Yes it is crystal controlled, but
we can change that as well!




The 4CX-250 has a hefty Blower assembly to
keep it cool.






The socket utilizes a chimney as well!



We are going to need a few changes the pi-net output has to be designed
for 500 KC. preferrably the whole segment used by the crew. Then the
matching unit has to be set up with low pass filters to the output tuner.
But it is all do-able with a little design savvy.