Hi,
I underline the experience of Bill with mine: I have used the 470pF / 15kV /
40kVAr version and the 330pF / 15kV / 30kVAr type for matching shortwave
broadband antennas in applications for up to 5kWcw at my QRL. Not ONE failure
in harsh teperature changes so far for nine years! They ARE really reliable.
By the way, I have a bunch of these left for sale: 470pF, 330pF and 220pF. Just
drop a mail if you are interested.
73 de Andy DH5AK
----- Original Nachricht ----
Von: "Bill, W6WRT" <dezrat1242@yahoo.com>
An: ka1mwp@comcast.net
Datum: 07.05.2009 16:36
Betreff: Re: [Amps] russian door knob caps for R Ftank circuit
> ORIGINAL MESSAGE:
>
> On Thu, 7 May 2009 07:14:18 -0400, "chuck" <ka1mwp@comcast.net> wrote:
>
> >I read thru about 6 months of backissues here but didn't see mention of
> the
> >russian door knob caps that are always on ebay.
> >Anyone know which ones and the markings on them are OK for hi current use?
>
> REPLY:
>
> I have eight of them in my homebrew 8877 amp and they are all
> excellent so far. I have three 3300 pF in use for plate coupling (to
> the pi-net) and HV DC bypass, and five 470 pF as padders for the load
> capacitor.
>
> There is nothing subtle about Russian doorknobs. They are built like a
> tank. I highly recommend them. Oddly, the 3300 pF use 10-32 screws and
> the 470 pF use metric. Both of them came without screws, so be
> prepared.
>
> 73, Bill W6WRT
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