[Boatanchors] Filament bypass caps

[Carl]

Its not the voltage but the RF current that is a concern. The usual .01 
or .02 filament bypass is a 1 KV unit to minimize heating from what 
little RF gets thru the choke.

Carl
KM1H

----- Original Message ----- 
From: "J Forster" <jfor at quik.com>
To: "Barrie Smith" <barrie at centric.net>
Cc: "Boatanchors Mail List" <boatanchors at mailman.qth.net>
Sent: Sunday, August 17, 2008 7:04 PM
Subject: Re: [Boatanchors] Filament bypass caps


> Most filaments are operated pretty near ground. The bypasses are for 
> RF. 100 V or so  should be fine, except if the filament
> is elevated significantly above or below ground for some reason (radar 
> or CRTs).
>
> Best,
> -John
>
> =================
>
> Barrie Smith wrote:
>
>> I've spent quite a bit of time recently attempting to discover what 
>> the voltage rating for filament bypass caps should be.
>>
>> In old and new handbooks I rarely see a voltage rating, just ".01", 
>> or .001".
>>
>> Is there a formula for determining the safe voltage rating for bypass 
>> caps?
>>
>> 73, Barrie, W7ALW
>> _______________________________________________
>
> _______________________________________________
>