On 16/02/2015 16:23, Mihai wrote:
Any chance of going back to my initial question?
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I built a simple "7 segment" clock using IN13 tubes. Even though they
have the primer, I found that initially the tubes struck in different
places and were irratic when trying to sweep a bar across the tube. I
ran them 50% over current for a few hours and then used the controller
to continuously sweep them backwards and forwards. After a few days of
this treatment they started to behave and have worked faultlessly since.
I've no experience with IN9 tubes. If you look at the schematic you will
see it is very crude as I do not use any opamps to offset the voltage
drop but only run the DAC over a limited range. Don't know if this
helps or not.
http://www.sgitheach.org.uk/ss.html
Grahame
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