[time-nuts] Thunderbolt monitor

Didier Juges didier at cox.net
Thu Jul 17 00:43:17 EDT 2008

Interesting, I can show you my two VCRs with dim displays (Panasonic and
JVC, both about 10 years old and on 24/7), and I have used a number of the
Noritake VFDs in an application where the devices have been on 24/7 since
2000. In that application, only 2, 3 or 4 digits are on all the time, the
other digits are only used for a special test mode and have probably less
than one hour total of operation in 8 years. The digits that are on all the
time have dimmed appreciably, but are still readable. The digits that are
not normally used are extremely dim when operated, where they are unreadable
in normal light.

I have not asked the manufacturer about that, since the units are well
beyong varranty, we just replace the displays.


> -----Original Message-----
> From: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] On Behalf Of Jeffrey Pawlan
> Sent: Wednesday, July 16, 2008 10:40 PM
> To: Discussion of precise time and frequency measurement
> Subject: Re: [time-nuts] Thunderbolt monitor
> 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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