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Re: [Amps] Switching PS for filaments?

To: amps@contesting.com
Subject: Re: [Amps] Switching PS for filaments?
From: "Paul E. Cater" <paulcater@roadrunner.com>
Date: Sun, 18 Feb 2007 15:51:38 -0500
List-post: <mailto:amps@contesting.com>
Might want to quantify if we are talking about directly or in-directly 
heated cathodes during each comment too.  It do make a difference. 

rgroh@swbell.net wrote:
> Ok, how about pulling all the treads together on this topic and both 
> summarize and visualize an ideal filament supply -
> 1.    Regulated DC voltage - low noise
>
> 2.    Voltage output settable to accommodate different tubes *
>
> 3.   Output current is both controlled (will take care of turn on) and 
> limited - current limit settable to accommodate different tubes
>
> 4.    Ability to interlock with other control circuits to, for example, ease 
> implementation of delaying application of HV, interlock with blower,  
> delaying turnoff for cooldown. 
>
> 5.    It would be neat to tie all of this plus the voltage settability* to 
> allow even more flexible operation such as standby operation (i.e. running in 
> a 'almost ready' to go on the air - filament running at lower voltage, no HV 
> applied, etc, low speed on fan and then, with one switch contact, be up full 
> and ready to go in a couple of seconds).
>
> There has been a lot of discussion about whether or not controlling current 
> on start is good, whether running filaments at lower voltages will prolong 
> tube lifetime, etc. There is certainly debatable aspects of these factors but 
> probably two points would be admitted by most (if not all) of us:
> 1.    Controlling filament current surge on startup can't hurt
> 2.    Delaying HV application until filament is up to temperature and 
> stabilized can't hurt
> 3.    Having a cool down period can't hurt.
>
> Agreed?
>
> 73
> Bob, WA2CKY
>
>
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