>
>Good Morning everyone,
>
> I'm trying to reconcile some design issues with an unusual 4-400
>amplifier I've been kicking around the past couple weeks.
>
>
> Does anyone:
>
>
>1. Have a feeling for what the value of the stray plate circuit
>capacitance (excluding the tube itself) would be with reasonably short
>connections from the plate to the blocking cap and then to a small vacuum
>variable?
>
? maybe 2 or 3 pF.
>
>2. Know if Jennings ever made a 5-250 pF 10KV vacuum variable
>physically shorter than 6" overall?
? The shortest one in the catalog is 7.68". The most space saving way
to mount vacuum variables is vertically. Multronics makes an ideal
right-angle drive that replaces the orig. bushing at the end of the vac.
variable's drive shaft. // Vert. mtg. solves shaft alignment probs,
slightly reduces stray L, reduces stress on seals and eliminates the
strain of gravity on the soft, oxygen-free copper plates. . . and
Jennings recommends vert. mtg.
good luck, Marv.
Rich...
R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures
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