[Amps] Serious design stage

[Jim Isbell]

After collecting parts for most of a year I am in the serious design 
stage of a 4-1000A linear.  The power supply, because of its size is to 
be external and connected by a cable.

In the first design I was going to bring the 6500VDC power through a 
cable to the linear.  But then it occurred to me that since the main 
reason for the separate supply was the size...which is MOSTLY the 12KVA 
transformer I am using.  It might be safer to just make the transformer 
external and have the rectifiers and filter capacitors in the 
transmitter case thus allowing the only the transmission of AC, at a 
lower potential, (using a voltage doubler circuit) in the cable.  Thus, 
by just turning off the input power I could eliminate the potential on 
the cable instantly...or almost so...while the filter capacitors which 
are the biggest danger would be in the transmitter cage and would be 
connected to shorting circuits controlled by the safety switches on the 
lid of the transmitter.

There must be some reason this is not a good idea as I have never seen 
it done.

Any comments???