Normally, the tuning shaft/screw/plunger is at chassis ground, and the fixed
piece of the capacitor is the "hot" side, so I don't see the issue. Of
course, which is grounded and which is floating is up to the builder, but
the logical method is for the moving part to be ground. Only exception is
when the cap is used as a series element, so both ends are "hot;" I've seen
this when the vacuum cap is used as a neutralization adjustment in a
high-power transmitter, but it's not common in amateur amps.
WB2WIK/6
"Success is the ability to go from failure to failure with no loss of
enthusiasm." -Winston Churchill
> -----Original Message-----
> From: Lynn [SMTP:no9z@soltec.net]
> Sent: Monday, February 17, 2003 10:58 AM
> To: amps@contesting.com
> Subject: [Amps] Grounding Vacuum cap shafts
>
> What is proper way to handle the tuning screw(shaft) on vacuum
> capacitor?
>
> I have seen amps that use hv insulators between the vac cap and
> the turns counter and I have seen amps that just use the ground
> provided by vac cap itself and the turns counter.
>
> Is the non insulated shaft a serious safety threat to the operator?
>
> thks in advance for
> any comments.
>
> Lynn NO9Z
>
>
>
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