I've noted the same with some old NL840/841 variants....sometimes I've found holding a reluctant tube next to a plasma globe for a few seconds has helped...don't ask me why...;-)
On Wed, Jun 7, 2017 at 3:39 PM, Jeff Walton <[email protected]> wrote: > Run them for awhile. Sometimes with old tubes it takes awhile to fire all > cathodes and clear surface deposits. Use higher voltage to get them to > fire and then back down to just run for awhile. I had some old IN-8-2 with > fine grids that took about 2 days before they would light properly and now > they are fine. 1967 tubes... > > Jeff > > > > > -------- Original message -------- > From: Robert L <[email protected]> > Date: 6/7/17 1:48 PM (GMT-06:00) > To: neonixie-l <[email protected]> > Subject: [neonixie-l] Re: Well I tried, big tubes on ebay this am > > > OK... Tubes just arrived in good condition from USPS, mixed results > testing them... But both tubes have multiple working digits. > > Crack in the glass on tube 10 does not go all the way through... Not too > surprising as the glass is about 3 mm thick! the better part of 2 mm glass > intact. > > Tube 9: working digits: 1, 2, 7, 8, 9, 0 > Tube 10: working digits: 1, 2, 3, 4, 7, 8, 9, 0 > > Not bad! Would have loved one tube with a complete set of digits, but no > complaint! > > Suggestions on applications with this limited set of digits? A clock > displaying 12:37 all day long and right twice a day? A restricted output > random number generator? Ideas??? > > B > > -- > 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/193b7309-8acb-47ea-b1e0-01a895a5e607%40googlegroups.com > <https://groups.google.com/d/msgid/neonixie-l/193b7309-8acb-47ea-b1e0-01a895a5e607%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 email to [email protected]. > To view this discussion on the web, visit https://groups.google.com/d/ > msgid/neonixie-l/4lvp9d3sf7m190jyam6vwix5.1496875152065%40email.android. > com > <https://groups.google.com/d/msgid/neonixie-l/4lvp9d3sf7m190jyam6vwix5.1496875152065%40email.android.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/CAOX%2BRH%2BzyLy1W9iWMwEh7BFUWu%3D_nk4%3DUtU0o-sTOTb1WzzrmQ%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
