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Re: [Amps] How best to reduce filament voltage?

To: <w2cqm@juno.com>, <amps@contesting.com>,"Norman Hockler" <sanorm@columbus.rr.com>
Subject: Re: [Amps] How best to reduce filament voltage?
From: "Tom W8JI" <w8ji@w8ji.com>
Date: Fri, 2 Feb 2007 10:32:29 -0500
List-post: <mailto:amps@contesting.com>
This will not work. Don't do it.

> Install a resistor on the primary side of the transformer. 
> Much
> lower current and the resistors will act as a
> soft start for the filament to damp the inrush when you 
> first turn on
> power.  Set the resistor value with the
> tube on and warm  There are many sliding tap resistors 
> available from
> the distributors or a fixed one will
> work as well. Ohms law calculation to determine the value.

It will totally hose the voltage regulation under load, and 
the resistors would have to be huge.

73 Tom 


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