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? > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msg/neonixie-l/-/KcK987MmMD4J. For more options, visit https://groups.google.com/groups/opt_out.
