[time-nuts] HP 53131A display dim

Chuck Harris cfharris at erols.com
Sun Nov 8 22:28:38 EST 2015

The biggest cause of failure with VFD's that I have seen
is the filament voltage drops too low.  Usually it is a bad
capacitor in the supply, or a drifting resistor on the regulator.

I have a VFD on an alarm clock made by GE back in 1980 that
has been running 24/7 since it was bought, and is still way too
bright.  I make my wife prop something to block it so that it
doesn't keep me awake.

-Chuck Harris

cdelect at juno.com wrote:
> Anyone know about these displays?
>   If the display is getting dim do I need a new VFD module?
> Thanks,
> Corby
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