That was my first thought that the tube was connected wrong but as XN-11 pins run 1 to 0 instead of 0-9 and the circuit board is dedicated to them I was extremely careful to make sure it was aligned properly by even illuminating the stand tube before soldering to check all wires were correctly lined up to their relevant hole. It has been checked on another 2 QTC boards one of which is running GNP-7AH tubes and shows the same symptoms so it is a case of "He's dead, Jim!"
A power supply is high on my list of wants just now as on board testing is not the best way. The close up shows the white spot on the mesh as well as several blue areas behind the mesh. <https://lh3.googleusercontent.com/-hTnEoDq28zg/WVgZZYAmM6I/AAAAAAAABLk/5Dehc3mZjMs5C0wgCkVi1GxKBUvtIa2owCLcBGAs/s1600/XN-11%2BClose%2BUp.jpg> This is the XN-11 board configuration from Pete's QTC PDF <https://lh3.googleusercontent.com/-nPJH2ikPKdY/WVgZqS15s0I/AAAAAAAABLo/Tc86vCXTGZEEYRNDggq7jdvulGZrIxHEACLcBGAs/s1600/XN-11%2BConnectiions.jpg> The pinouts of the XN-11 as opposed to those on an IN-8-2 which is 0 to 9. <https://lh3.googleusercontent.com/-MljyvngGIHM/WVgaGhPIH7I/AAAAAAAABLs/16bY4jaibZQCAkojxPTkxh8sOCr8IbpMQCLcBGAs/s1600/HIVAC%2BXN-11%2BPin%2BOut%2BDiagram.jpg> On Saturday, July 1, 2017 at 1:46:19 PM UTC+1, Paul Andrews wrote: > > Never on the mesh (yet), but I did see something similar when I had one of > the numerals wired as the anode rather than the actual anode (in my > defense, the actual anode pin was missing). > > I would check that it is wired correctly, including possible shorts. Then > check it on a different QTC mother board to see if it is the motherboard. > Then check a different type of tube on the original motherboard to see if > you get the same effect (another check of the motherboard). > > I also don't have a bench supply - it is on my list - but in the meantime, > I use a NCH Nixie power supply and a breadboard. The power supply is rock > solid and the voltage is easily adjustable. > > Good luck. > > -- 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/msgid/neonixie-l/f332636f-fc64-4177-928a-1edf8a5b24ed%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
