[Amps] FW: door knob capacitors

[Carl]

At that power level a 5KV RF doorknob will be fine. Its not a TC issue as 
much as current carying ability which does not exist in lower rated ones.

A couple of 2000V silver micas in parallel would also work well at the QRP 
level that is indicated (-;

Old block micas would also work but most of those are into serious leakage 
by now

Carl
KM1H


----- Original Message ----- 
From: "DF3KV" <df3kv at t-online.de>
To: <amps at contesting.com>
Sent: Sunday, February 27, 2011 2:36 PM
Subject: [Amps] FW: door knob capacitors


> Why do you want at least a 10KV rating while the capacitors will not see
> more then 500V?
> More important is to select a RF doorknob with low TCC.
>
> 73
> Peter
>
>
> -----Original Message-----
> From: amps-bounces at contesting.com [mailto:amps-bounces at contesting.com] On
> Behalf Of Glen Zook
> Sent: Samstag, 26. Februar 2011 16:08
> To: amps at contesting.com
> Subject: [Amps] door knob capacitors
>
> I need either a 1000 pf or two 500 pf door knob capacitors with at least a
> 10 kV rating.  These are for use as loading capacitors in a 160-meter 
> single
> band liner using a pair of GI-7bT Russian tubes.  The amplifier is working
> but the capacitor that I have in parallel with the variable capacitor is
> 1400 pf and that puts the variable at minimum capacitance when loading a 
> 50
> ohm load.  The variable is 1000 pf maximum and dropping the parallel
> capacitance by 400 pf will get it working fine.
>
> Let me know how much, etc.
>
> Glen, K9STH
>
> Website:  http://k9sth.com
>
>
>
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