BTW, in the "RF Transistors" book, on page 103 there is a photo of a
large RF Power Amplifier that has 6 filters built using large Ceramic
Capacitors & Toroid forms.
Quote: ".... a 2KW prototype RF amplifier for a period of ten years
with over 5000 hours of operation without failure."

wrote:
Thanks Jeff for the information. However I think it is dielectric loss
and not working voltage that may give me trouble here. Even with 3kV
disc ceramics the loss is quoted at 2% so these will get hot at a few
amps. The low loss AVX hi-q ceramics do appear to be better but are not
east to find. I am new to amateur radio so just learning these things.
I did order the book you suggested. Thanks,
Paul.
Dr. Jeff wrote:
If you can, get a copy of the book " Radio Frequency Transistors" by
Norm Dye & Helge Granberg. There is a chapter specifically about
designing and building Filters to handle the output of Motorola based
transistor RF amplifiers.