Thank you Mike for the Analog Guidance Computer hint. It seems someone has been documenting it/them online: that's a route to follow to locate a schematic diagram.
And Martin's 439A datasheet is very helpful too. At least it is complete. I haven't made much progress, except that I even got the glow to stop in the "pick-up tabs". Also I have observed that the spinner stopped as room temperature decreased. Guides control voltage swings between +106V and -30V with respect to K1-K9 output cathodes, but even +106/-70V doesn't get a reliable spin. Next I will try to reduce the positive bias and to put a radiation source close to the tube, just in case it was doped with Kr-85 that would have very little activity left by now. I think that kind of doping was more important on tubes that needed a fast switch-on time while 439A/6167 was a slow dekatron. Paolo -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/CABj2Vabe4fGTw0BE_F3fn%3DAdcvNx5BYVtSNhFAN%3D-RU8qhTxbA%40mail.gmail.com.
