As the cathodes are “cleaned” by running at higher current, the problem with the wire glow may go away at regular current levels. My understanding is that a 40-50 year old tube that has not been run may still end up with some mild impurities on the cathodes which will “burn off” after running for awhile. Old tubes generally take a few moments to light reliably when first powered up.
The wire glow is sometimes impossible to fix, especially if there is no insulating coating layer on the wires. Jeff From: [email protected] [mailto:[email protected]] On Behalf Of Paul Andrews Sent: Thursday, March 23, 2017 12:35 PM To: neonixie-l Subject: [neonixie-l] Re: 6844A saga Well this is fun! I upped the current signifcantly (6.9mA - just over 2x recommended max), which caused some internal arcing briefly! Blew a resistor (I guess it was a 1/4 W. Interestingly it went from being a 5.1K to being a 27K resistor). Bottom line is it kinda sorta works. But the results are patchy and some of the wires still glow some. The Raytheon's are much better engineered. All of the incoming gubbins is sprayed with something white - maybe an insulating coating - and the anode mesh has some kind of arrangement in the anode to let out the splatter. You can see some in the pictures below. @Chuck, do you have a photo of the sockets you used? Though I was planning on just making my own. @gregebert, I like the dome shape on the Burroughs 6844A tubes. The 5092 tubes are more like the Raytheons. <https://lh3.googleusercontent.com/-RiyMtutjkwg/WNQGOsVWHII/AAAAAAAAAgk/FN6lQb3nscozJcUZoFf40obR3WlxDvNJwCLcB/s1600/IMG_1290.JPG> <https://lh3.googleusercontent.com/-XD8ZfGYbW_c/WNQGSEf0aXI/AAAAAAAAAgo/TD1Nkub_0XkDkzu9M2dEEoV1xrir0xgfACLcB/s1600/IMG_1289.JPG> <https://lh3.googleusercontent.com/-6liI4uzjai0/WNQGWLKEgII/AAAAAAAAAgs/eVacslStxp807Y-XerzDOm8jC8wTfb05ACLcB/s1600/IMG_1288.JPG> -- 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 email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/cae3a555-8b85-428f-9de0-f141be28ff8f%40googlegroups.com <https://groups.google.com/d/msgid/neonixie-l/cae3a555-8b85-428f-9de0-f141be28ff8f%40googlegroups.com?utm_medium=email&utm_source=footer> . For more options, visit https://groups.google.com/d/optout. -- 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/58d41bc0.83266b0a.a0707.277f%40mx.google.com. For more options, visit https://groups.google.com/d/optout.
