On Sunday, May 19, 2019 at 6:42:25 AM UTC+1, Thomas Kummer wrote: > > Yeah, I know that swapping G1, and G2 is how you change directions. Both > tubes won’t spin counter clockwise maybe cathode poisoning is the problem. > It sticks on a cathode after making a few revolutions. What would you swap > on the schematic to run a GS10D? >
OK, just sounds like the tubes are slightly sticky - happens quite often. The good news is that if you can spin them OK in one direction, they can normally be unstuck in the other direction. The simplest thing to try might be to run the tubes clockwise for a couple of hours to generally clear the crud off the cathodes, and then try changing the direction. If that doesn't work, my next move would be to increase the magnitude of the guide pulses. I'm not familiar enough with Mike's circuit (or indeed valve circuits in general) to confidently recommend the change - if I had to fiddle blind without access to an oscilloscope or other test gear I'd probably try changing R11 and seeing what difference that makes. Your GS10D will need more anode current than the 6476 & Z562S, so reduce the anode resistor to 300K. It also needs larger guide pulses than the other two tubes, but I don't know what the circuit is currently producing in order to judge how far off spec they currently are. Jon. -- 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/773ef80f-9275-4ee0-a957-920e9873190a%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
