Leigh S. Jones, KR6X wrote:
> http://www.tomstubes.com/4CX800A.htm for a data sheet
>
> You've got some problems. First of all, the tube is good for 2 KV DC and
> pushing it to 2.6 KV would not be recommended. Secondly, the output
> capacitance is not nearly as high as you imagine (9-13 pf).
I've checked a number of ceramic valves when in situ in a chassis, and
the C from anode to ground is usually around twice the data sheet value.
For a 4CX800, a couple of inches away from the sidewall of a box, I got
21pF.
Steve
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