I just finished my first GSA10G tester which is connected to a GR10K Nixie. These Dekatrons are really finicky when it comes to driving them. There are errors in the datasheet schematics and component values, but the book "Cold Cathode Tube Circuit Design" by D.M. Neale has described the necessary calulations for the component values on page 229-237. I also found references for the German Z572S to be helpful, those Dekatrons are even more finicky in their driving requirements. I accidentally forgot to include the Anode resistor when I hooked up the first Z572S and it promptly lit up like a Christmas tree! It got very warm from just a few seconds with full power, every wire inside the Z572S was glowing like it was a neon lamp, fortunately it wasn't destroyed! >From the Youtube page: "GSA10G Dekatron driving GR10K Nixie counting! Dekatron driving Nixie directly via auxilliary anodes. Sine wave drive from oscillator" : http://www.youtube.com/watch?v=DAnyKhPUpgk
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