Re: [neonixie-l] B7971 - better contrast

[Nicholas Stock]

I have a MOD_6 with pin-top tubes in them. Absolutely no visual difference to the non-pin ones when compared side by side. Jeff, you should have bought more when you could!!!! 😀 I still rue the day when I thought a box of 100 IN14's at $99 was expensive..... Nick Sent from my iPhone On Jul 6, 2023, at 07:34, Robert G. Schaffrath <robert.schaffr...@gmail.com> wrote: I have one of the pin top tubes (https://n2jtx.com/NixieClock/Used%20Burroughs%20B-7971.jpg). Unlike most of my other tubes, it is a Burroughs branded tube and not Ultronics. The only thing I ever noticed different about it was it seemed to have a deeper red glow than the Ultronics tubes which are more orange. Perhaps a different amount of mercury in it. Someday when I think about it I'll test it again. On Wednesday, July 5, 2023 at 3:50:55 AM UTC-4 Jeff Walton wrote: I have a number of these "rare pin-top" B-7971's and do not find any significant difference in contrast with the Ultronics versions of the 7971s .  The pin-topped or "antenna top" construction is an early format that uses a wired backplane instead of the PCB style interconnect.  It's a nice tube that looks good as a group in any clock.  There is no practical difference in operation  or appearance and there are certainly some MOD-6 clock owners that have full sets of these tubes in operation will tell you that they are equally reliable.   They will have date codes in the mid-1960s.  It is uncommon to see a group like this available.   $250 to $275 each per tube seems to be the going price on ebay these days.  Overpriced but worth whatever someone is willing to pay.   My first tubes were $8/pair from Buckbee-Mears and Polypaks back in the early 1970's and included the boards with each pair.   Jeff  -------- Original message -------- From: Robert <robnor...@gmail.com> Date: 7/5/23 2:11 AM (GMT-06:00) To: neoni...@googlegroups.com Subject: [neonixie-l] B7971 - better contrast Not my auction but I saw this https://www.ebay.co.uk/itm/266322565516?mkcid=16&mkevt=1&mkrid=711-127632-2357-0&ssspo=v3sg3SvYRJa&sssrc=4429486&ssuid=U1YeAcPgQ5y&var=&widget_ver=artemis&media=COPY In the description it says “This sale is for lots of "Pin-Top" version of the B-7971. The rare "Pin-Top" versions are made with a darker background on the segments that provide better contrast.” I have some of these but have never noticed this Rob -- 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 neonixie-l+...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/A272F92E-A09A-48E8-A051-2C15C292A57F%40gmail.com. -- 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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/7e3257e3-e81f-4f76-b97e-9d564641af74n%40googlegroups.com. -- 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 neonixie-l+unsubscr...@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/95CC668F-34AA-4719-AD2A-0464AC16EC72%40gmail.com.