[time-nuts] Thunderbolt monitor

Neville Michie namichie at gmail.com
Thu Jul 17 18:50:34 EDT 2008

 From my thermionic valve days,
the emmissivity of a filament was greatly extended by under-running  
If the display is pemanently run at a lower current in dim mode,
how long could the life be extended by dropping the filament voltage  
by a small margin?
cheers, Neville Michie

On 18/07/2008, at 8:35 AM, d.seiter at comcast.net wrote:

> I too have never seen one go dim.  In fact, I have a VCR (Beta!)  
> that's been pluged in continously since I got it new in the early  
> '80s.  It still looks the same as when I got it except that the  
> display has had a left to right wave going through it since about  
> 1995.  So, wavy- but not dim at all.
> -Dave
> -------------- Original message --------------
> From: Jeffrey Pawlan <jpawlan at pawlan.com>
>> Regarding the VFD display, although they may be very different one  
>> manufacturer
>> to another, I can definitely dispute a prior statement made that  
>> VFDs in general
>> have a short lifetime and become dim. They are universally used in  
>> VCRs, DVD
>> players, microwave ovens, and some clocks. I have never had one  
>> become dim or
>> burn out. The displays in my appliances are on even when the rest  
>> of the
>> appliance is off. I have never seen one become dim even after 15  
>> years of
>> on-time.
>> I look forward to your project.
>> 73,
>> Jeffrey Pawlan, WA6KBL
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