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John K
- Original Message -
From: gregebert
To: neonixie-l
Sent: Tuesday, October 31, 2017 10:55 AM
Subject: [neonixie-l] Re: Half-digit neon bulb 25/15 mm long
If I had to guess, one or more electrolytic caps has probably dried-up and is
no longer working as a capacitor
There are three test points in there, two for voltage rails and one
apparently for a time base. I suspect the power is OK if it does power up
at all (unless all the logic chips needed for display do not use it and
have separate voltage rails), what about the 5HZ point?
Also, if the reading is
>From the photo, I see what looks to be a blue electrolytic capacitor at the
top (photo is clipped). It's a long-shot, but that's almost 50 years old so
I wonder if it dried-out. I had the same thing happen to me with a Heathkit
that was 30 years old: small electrolytic cap dried-out, became a
I think producers of neon bulbs decided to make searches extra hard
(datasheets with no dimensions or dimensions not tied to bulb name, using
same name for different bulbs etc). But I think I've found something quite
similar in size:
If I had to guess, one or more electrolytic caps has probably dried-up and
is no longer working as a capacitor. Probably a good idea to replace all of
them with fresh ones. Keep an eye out for corrosion on the PCB from leaky
electrolytics, and be aware that some probably contain PCBs (not
