Hi Eddy,
You may find my compendium of plate choke technology to be of interest:
http://wc6w.50webs.com/wc6wamps/index.html?fr62.html
73 & Good morning,
Marv WC6W
--- On Thu, 2/5/09, Eddy Swynar <gswynar@durham.net> wrote:
> From: Eddy Swynar <gswynar@durham.net>
> Subject: [Amps] Plate Choke Values
> To: amps@contesting.com
> Date: Thursday, February 5, 2009, 4:35 AM
> Good Morning All,
>
> Am I missing something here...?
>
> Extensive research here into years & years of ARRL
> HANDBOOKS, Bill Orr HANDBOOKS, and the internet have shed
> precious little light in the matter of optimum / minimum
> values of inductance for plate chokes in the B+ leads of our
> tube-type linear amplifiers.
>
> Have a look-see yourself: in designs that feature
> amplifiers that only go as low as 3.5-MHz, you'll see
> chokes that range in value anywhere & everywhere from
> 200-uh, to 50-uh. On 160-meters, I've seen quoted values
> as high as 1.0-mh., and others as low as 200-uh.
>
> Just what, exactly, is a "...minimum reactance"
> for a choke, on a given frequency band, to do its job
> effectively, anyway...?
>
> I know confusion can creep in in the form of the
> self-destruction of these parts if the hapless home brewer
> happens upon a band where there's self-resonance in the
> choke...but that issue aside, is this all some matter of
> "...by gosh & by golly black magic", or are
> there very real minimum standards & parameters that we
> should adhere to...? And if so, where are said standards
> published...?
>
> I certainly can't find them via "...the
> usual" routes --- but again, I must be missing
> something here...
>
> ~73~ Eddy VE3CUI - VE3XZ
> _______________________________________________
> Amps mailing list
> Amps@contesting.com
> http://lists.contesting.com/mailman/listinfo/amps
_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps
|