Tim, spot on!
I finished testing and had a nice pile of mis-behaving tubes that would
snatch to the other end on the first glimpse of FSD and jump about during
ascent and descent. I de-soldered one leg of my reservoir cap so they have
a nice 100Hz ripply supply and they all, instantly, work
Hi guys,
I have been stock piling bar-graph tubes for a while now due to
their relatively cheap price and potential for interesting looking clocks
or other animated displays.
Due to a few being smashed in a recent shipment I decided to sit down and
work through testing all 450 or so IN-9's
Hi Alex
I've only used the IN13 (the one with the primer electrode) and they all
did as you described initially (despite the primer). I wrote the
microcontroller code to repeatedly sweep the tube current up and down
over about a second and left a batch of 8 running continuously. I think
it
Hi Alex,
First things first, I love IN-9 tubes and am in the process of making an
audio spectrum analyser with them. I have both the orange and violet
versions. My violet ones having the purple top and do illuminate with a
very purple glow :o) These tubes are trouble and very hard to make
Cheers for the replies guys, I suspect that with a bit of running in most
of the tubes I have labeled Slight poisoning will come right... It is
strange that your purple topped tubes are distinctly different from white
topped, maybe I got lucky with my white topped but I defiantly prefer the
That is very interesting that you are not using a SMPS and still having the
trouble. I have never tried the tubes with a full bridge only a half, I
wonder if the difference between 50Hz and 100Hz makes any difference, I
cant see why it would.
You say you have a large reservoir cap,
I spent quite a bit of time with IN9 and IN13 making my one digit 7 segment
clock (http://youtu.be/mQ1567EFCY0). Someone was also asking about them
over on tubeclockdb.com, and this is how I summarised my experience there:
*My recollection is that a batch of neon IN-9 tubes would generally
