I'm looking at those doorknob caps for sale from Ameritron. Actually
they are listed as MFJ but it's all the same now.
They have two types:
500 pF 7.5 KV and 170 pF 7.5 KV. They are made by High Energy (type
HE50) and sell for $22 each from MFJ. I wanted more information
about their current rating v. frequency so I went to the HE website
and found this data page:
For the 170 pF cap the fL and fH give me some confidence but as value
goes up, frequency range lessens so one has to de-rate the current
capability for the high-bands. but for load cap padders for a ham amp
even the 500 pF is probably okay at 30 MHz. I'm still sticking with
what I have on hand for now though, my 2 buck micas because I am a
On Sat, Mar 5, 2011 at 11:06 AM, Carl <firstname.lastname@example.org> wrote:
> Those are Teflon and not mica.
> Ive been looking for the manufacturer.
> ----- Original Message ----- From: "Rob Atkinson" <email@example.com>
> To: <firstname.lastname@example.org>
> Sent: Friday, March 04, 2011 4:14 PM
> Subject: Re: [Amps] door knob capacitors
> okay, Genn; Hi Bill, I know about Ameritron but I usually forget to
> consider them, thanks. for the reminder. I will take a look at what
> they have.
> Why don't you just order what you need from Ameritron? They have mica
> loading padder caps @ reasonable prices. That goes for any part from any amp
> they make.
> Phil, K5PC
> On Fri, Mar 4, 2011 at 11:05 AM, Glen Zook <email@example.com> wrote:
>> No problem! My topic was finished a couple of days ago.
>> Glen, K9STH
>> Website: http://k9sth.com
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