[neonixie-l] Re: Weird spot on XN-11 Anode

Very likely, the infamous "blue dot". The unused cathodes are clamped to 62V. I believe those unused cathodes, at that potential work somewhat like the beam plates, in beam power tubes, like the 6L6. The blue, at or near an anode, seems dependent on current density. The greater it is the more

[neonixie-l] Re: Weird spot on XN-11 Anode

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

[neonixie-l] Re: Weird spot on XN-11 Anode

If the mesh glows (as this one seems to be doing) then suspect that there is AC instead of DV applied. The mesh can't glow when the right potentials are applied, whichever the value of the current through it is. Gastón On Friday, June 30, 2017 at 8:11:55 PM UTC-3, Roddy Scott wrote: > > I

[neonixie-l] Re: Weird spot on XN-11 Anode

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

[neonixie-l] Re: Weird spot on XN-11 Anode

I believe that it is the same symptom as the "blue dot" effect in Nixies, you can read about "The Infamous “Blue Dot”:" a bit down on Michael Moorrees webpage: https://threeneurons.wordpress.com/nixie-power-supply/ . I've seen both orange and blue dots on several Nixies. I recently had orange

Re: [neonixie-l] Re: Weird spot on XN-11 Anode

I have seen similar 'bright dots' on ZM1032 tubes Nick Sent from my iPhone > On Jun 30, 2017, at 16:11, Roddy Scott wrote: > > I don't have a power supply but the spot occurs on the mesh and with a > different digit there is a a different spot. The tubes were NOS

[neonixie-l] Re: Weird spot on XN-11 Anode

I don't have a power supply but the spot occurs on the mesh and with a different digit there is a a different spot. The tubes were NOS and I have had them lying about for over a year in a box. I have a couple of QTC boards so I am going to try them on those boards to see if they are the same.

[neonixie-l] Re: Weird spot on XN-11 Anode

How do things look when you bench-test the tube on a DC supply ? Is the spot actually on the anode mesh itself ? Ionization occurs at the cathode, so this is indeed strange. -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from