Hi all, I saw that I hadn't put all measured voltages on the A-201 Polyatron in the schematic diagram so I add them here until I have made a new schematic diagram with them. *. The voltage directly on the screen electrode is approximately +156V (pin 9) *. The voltage for an auxilliary anode on the A-201 Polyatron when the Nixie digit is lit is +292V *. The voltage for an auxilliary anode on the A-201 Polyatron when the Nixie digit is switched off is between +360V and +390V - this voltage varies depending on which digit is lit and how the 100K resistors work as a voltage divider, and also depends on which digit you measure the voltage on. *. All resistors used are metal film resistors from Vishay with a oltage rating of 500V where necessary, otherwise the voltage rating is 350V. *. Diodes marked 7' are 1N4007, transistors marked A42 are MPSA42. I hope this extra information makes it easier for anyone who wants to build the design to check the circuit if something doesn't work. /Martin
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