[AMPS] Filament Inrush Current Limiting

measures 2@vc.net
Fri, 28 Apr 2000 00:58:19 -0700

>-----Original Message-----
>From: measures <2@vc.net>
>To: Steve Thompson <rfamps@ic24.net>; AMPS <amps@contesting.com>
>Date: 27 April 2000 17:05
>Subject: Re: [AMPS] Filament Inrush Current Limiting
>>>-----Original Message-----
>>>From: RCM <robrk@pgh.net>
>>>To: Phil Clements <philk5pc@tyler.net>
>>>Cc: amps <amps@contesting.com>
>>>Date: 25 April 2000 23:28
>>>Subject: Re: [AMPS] Filament Inrush Current Limiting
>>>>What about turning down the voltage, like to half for moderate standby
>>>>times (dinner). I remember
>>>>reading something in some broadcast book about the standby transmitter
>>>>filaments being switched to
>>>>half or less voltage as in semi-hot standby..
>>>I have a vague memory of reading something that suggested that running an
>>>oxide cathode much cooler than intended can lead to 'poisoning' or somesuch.
>>>Anyone fill in on this one?
>>Not enough heater potential causes the oxide coating to flake off the
>I can see that this happens if you draw current from a cathode that's too

Correct -  there is no damage until cathode current flows in an 
insufficienty heated cathode.  . 

> but does it do any damage in standby?

cheers, Steve

-  Rich..., 805.386.3734, www.vcnet.com/measures.  

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