Miss-Counting
I have one tube that counts 0,2,3,4,5,6,7,8,9,9,0,2 … Looking at the x' and anode 2 voltage you
see:
You can see the step from the '0'
position to the '2' position is twice
the height of the other steps.
Double stepping like this does not
normally occur until the step pulse
voltage is over 20V. Experimentally
I tried reducing the step voltage
but all that happened was that
tube stopped stepping entirely at
about 10V.
My conclusion is that this a a faulty
tube and no tweak to the clock
electronics would get the tube
working.
The tube was given to a collector.
Crazy Lacquering
Some E1T tubes appear to have been lacquered. I know not
why. With time the lacquer can be damaged or in extreme
cases become crazed. It is not hard to remove the lacquer with
a mild solvent such as isopropyl alcohol (IPA). If you decide to
do so be careful not to damage the decal.
Damaged Decals
It is not unusual to buy second hand tubes that have scratched
decals. Here the decal on the left is badly damaged. The decal
on the right has a fairly small hole in the bottom left corner
which would not really notice in use in a Fortress E1T Clock. (I
hope to have replacement decals available at some stage, so all
will not be lost.)
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Содержание An E1T Timepiece
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Страница 120: ...E1T Data Sheet Page 120 Version 1 0 Copyright Grahame Marsh Nick Stock 2019...