Working on an army battery set back in the '70's I wondered if polarity would
make a difference; I thought that one end would be more biassed than the other
wrt grid, but when I reversed the polarity, it made no difference. Not sure if
this is the same effect of which you speak.
David
G3UNA
>
> From: "Roy" <royanjoy@ncn.net>
> Date: 2008/02/13 Wed PM 04:55:57 GMT
> To: <amps@contesting.com>
> Subject: Re: [Amps] filament supply d.c. or a.c.
>
> Asked,
>
> "Looking for reliable information regarding filament supply to amplifier
> tubes. What are the pros and cons for D.C or A.C volts."
>
>
> Definition of 'filament' indicates a directly-heated cathode. In this case,
> using DC causes a variable voltage gradient across the length of the
> filament, acting as a variation in bias at an infinite number of points
> along its length. This has a number of ill effects. With indirectly heated
> cathodes, AC or DC is just fine.
>
> 73, Roy K6XK
>
>
>
>
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>
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