The OEP brand caps that most all the amp companies buy have always had poor
rotor contacts. They now have 3 different levels of current handling but
what Ive seen used is still the cheapest. Dont know about the new Alphas.
Trying to find a dual 500 to 1000pf cap is near impossible. There still are
4 and 5 section BCB style caps available of the old large style with
suitable spacing and heavy duty rotor wipers that can handle well over
1500W. Military and late 20's - early 30's radios are some sources of
400-500pf per section. Stay away from the oldies that use pot metal frames.
Carl
KM1H
----- Original Message -----
From: "Peter Voelpel" <df3kv@t-online.de>
To: <amps@contesting.com>
Sent: Tuesday, July 31, 2012 8:29 AM
Subject: Re: [Amps] 3CX1500A7/8877 vs el cheapo GS-35B
> With the air variables most problems are with the rotor contacts, better
> to
> use split-stator but used as load capacitors they become too bulky.
> Two years ago I had a problem on 10m with the vacuum anode capacitor, it
> was
> the glass type and while tuning to full output it burned a hole in the
> glass
> at the position off the gap.
>
> 73
> Peter, DJ7WW
>
> -----Original Message-----
> From: Jim Thomson [mailto:jim.thom@telus.net]
>
> On a similar note... we have had problems with air variable load caps
> getting hot on 10M..and also 6m. Folks from alpha tell me they also
> had
> heating problems with load caps on 10M.
>
> lots of vac caps have to be de rated on 10m band..depending on size. But
> u
>
> can easily look up the charts and graphs for current vs freq on any of
> them.
>
>
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