Hi Martin,
just very shortly: My only A201 is stamped OTK 6. It is a week vertical
stamp on the right side of the tube symbol. Super to hear about your
progress. I am so behind with everything that my own rear is in front of
me right now.
Marcin
On 16/03/2013 15:18, Dekatron42 wrote:
Thanks!
As soon as I have a finished version I'll post it here.
I have to check the limits of the voltages and currents for my circuit
so I can compare those to the datasheets so that everything will be
within tolerances, I don't want anyone to damage their rare Polyatron if
they try my design. I'll also try to check design by making some
calculations so that I know that it will be within tolerances.
Now that I have something that is working I am going to discuss this
with some friends so that I can be sure that the design will work within
the tolerances for the A-201.
I found out that one of my A-201's have a loose guide electrode so it
does not count correctly when passing the figure 2, it sometimes skips
that figure since the second guide electrode is not properly connected
to the common ring connecting all of the same guide electrodes. I'll try
to see what happens if I run this polyatron outside of its tolerances,
raising the voltage and current and see if I can get the electrode to
pass some current then. The small welding on that electrode looks poor
and the mica sheet surrounding that electrode also looks murky and poor
so it might be a manufacturing fault. There is also a few loose pieces
of the white insulation used on the cathode and screen electrode wires
in this tube.
I also have some more experimenting to do since there is not a lot of
information to go on when testing these polyatrons. I still haven't
figured out the proper voltages and currents for all of the different
bias and screen electrodes. There is a little spread in voltages and
currents necessary between the working A-201's that I have to get them
to run properly - I'll try to check the limits and also find the proper
working conditions. All of them run at one setting of voltages and
currents but the tolerances are very close then so I'd like to find
proper working conditions.
I have discovered some things that differ from driving normal dekatrons
and that is that these polyatrons are prone to self oscillations like a
neon lamp circuit with a capacitor. They are also showing a different
behaviour on the guide electrodes compared to dekatrons, there is a
negative pulse produced by the Polyatron guide which disturbs the
counting during some circumstances. I don't fully understand why this
happens right now and I have only been experimenting for three days and
just a few hours each day with them so I still have a lot of
experimenting to do ahead of me.
Does anyone know if these polyatrons were marked OTK or not? None of
mine have that mark so I am thinking that they might not have been
quality controlled.
If anyone has more information on these rare Polyatrons please send me
an email!
Just now while writing this I suddenly becmae aware of one fault in my
design, while just thinking about it, so that will have to be fixed,
maybe that will make the circuit work better!
/Martin
On Saturday, March 16, 2013 2:51:12 PM UTC+1, Dave wrote:
A W E S O M E. Can you post the circuit?
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