[time-nuts] Thunderbolt monitor
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.
> -------------- Original message --------------
> From: Jeffrey Pawlan <jpawlan at pawlan.com>
>> Regarding the VFD display, although they may be very different one
>> 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
>> I look forward to your project.
>> Jeffrey Pawlan, WA6KBL
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