I just bought 3 NOS VFD tubes, still in their original Radio Shack packaging.
I'm testing one of them, and noticed that some anodes are not glowing fully, and in fact require a much higher voltage to get decent brightness. I'm wondering if they have been sitting around for such a long time that internal contaminants have settled-in. Has anyone else seen this before ? I'm going to try running the dirty segments hot for a few hours; normal current is 0.5 to 1.5mA, but I'll try 2-3mA. The tube I'm testing now usually needs 25V for typical brightness, but I've got it over 100V now. I have a few other DT1705 tubes manufactured by TungSol, but I dont recall seeing any with signs of contamination. It's also possible that Rat Shack got manufacturer seconds; who knows.... -- 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/c4a0dd11-a559-4fad-9289-11bb5d3eed58%40googlegroups.com.
