Scott Townley wrote:
> Measured with a simple B&K capacitance meter (1kHz):
> 3-500Z grid to plate 5.0pF
> 3-500Z inserted into Johnson ceramic socket, recessed about 3/4" below
> aluminum chassis deck: 10pF
> Seem right? Kinda surprised that an extra 5pF just from sticking it in the
> socket...socket grid pins (all 3) are directly grounded to chassis.
I've done the same with various tubes - glass, big and small ceramic and
I always see the same as you, actual total C is about twice what's in
the tube itself.
Steve
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