With me it is the only B-7971 tube I have like that. It came from the first Ultronics board I ever purchased in the late 1970's. It came from Poly Paks IIRC. It was actually a bad deal for me. Apparently the board had been serviced which explains the genuine Burroughs tube that was on the board. The other tube is Ultronics (which I still have) and is defective. The #4 and #13 segments touch each other causing both to light when either is energized. The circuit board had jumpers soldered onto it and handwritten in fine tipped magic marker it said "modified for dummy 0". My parents joked at my expense that it was modified for the dummy (me). Why the Ultronic service center did not replace the defective tube rather than go through the effort of modifying the board escapes me. Especially since they replaced what I assume had been an Ultronic tube in the other socket. I could have had two Burroughs tubes with posts.
When I decided I wanted to get three more boards, I bought them from Meshna due to my bad experience with the other vendor. After I had those boards, I decided to splurge on the 6 NOS B-7971's. I still have one Ultronics board left that has the sockets still installed but no tubes. I used the other three for sockets and HV transistors to build my MM5311 clock. On Monday, October 7, 2019 at 7:48:07 PM UTC-4, Bill Notfaded wrote: > > They made less of the antenna variety from what I've seen. Most of mine > don't have them. > > Bill > > I also have I believe a 1.06 version of that clock that runs off the > mains. Mines running z566m red tubes. > > Bill > > -- 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/b92d4c7c-8299-4557-a833-f14623d4873e%40googlegroups.com.
