Amps
[Top] [All Lists]

Re: [Amps] Regulated filament current

To: amps@contesting.com
Subject: Re: [Amps] Regulated filament current
From: Steve Wright <stevewrightnz@gmail.com>
Date: Tue, 8 Sep 2015 08:05:20 +1200
List-post: <amps@contesting.com">mailto:amps@contesting.com>
On 08/09/15 04:00,

David Lisney <g0fvt@hotmail.com> wrote:

> [....] in directly heated cathodes the temperature would rise as the anode 
> current and drive rose. In the constant current example this would cause the 
> filament voltage to further increase which is the opposite to some of the 
> manufacturers suggestions. I believe for example that a 4CX250B with a 
> nominally 6v heater should have the voltage reduced to 5.5v if you are giving 
> the device a good "battering" close to it's maximum frequency and dissipation 
> rating. A constant current supply would do quite the opposite.

And this is exactly the type of thing I was meaning in an earlier post. 
Sometimes, well-meant, and on-the-face-of-it very clever ideas end up
discovering the hard way that tube is cleverer!  Oh well..

Make things as simple as possible but no simpler - Einstein.


S

_______________________________________________
Amps mailing list
Amps@contesting.com
http://lists.contesting.com/mailman/listinfo/amps

<Prev in Thread] Current Thread [Next in Thread>