I built a few clocks some years ago, both with the early DC106 modules (tube and diode based) and the later DC111A/B modules (transistor and diode based). Burroughs even described how to build clocks in some of their datasheets where they showed how to eliminate some spade positions if you wanted to count to any other number than from 0 to 9 and a clock was one of their simple projects.
To get a scale of six counter you can connect four consecutive spades together just using one set of spade components and using them as the reset signal to the flip-flop driving the Trochotron, it will then reset when any of the combined spades are hit by the beam. Then you just need a simple tube coincidence circuit for the hours portion to reset the clock to 00:00:00 when it reaches 24:00:00 (you'll have to modify this for a 12 hour clock though). Burroughs also combined two spades in two groups making the DC111B count 0,1,2,5,8,9 so no extra reset signal was needed, the original one from spade 9 was used - this way the beam skipped positions 2 & 4 + 6 & 7, you just hooked up the Nixie like 0-0, 1-1, 2-2, 5-3, 8-4 & 9-5 (Spade-Nixie#). You can see my original DC111A & DC111B modules here: https://youtu.be/4x8fR1NGFVA (counting 0-9) & https://youtu.be/O-JPo_Se10A (counting 0-5 with modification via two groups of combined spades). /Martin On Tuesday, 6 December 2022 at 03:13:16 UTC+1 LB wrote: > Hi everyone, > > I recently decided to begin designing a nixie clock with as few > semiconductors as possible, and that has lead me to dekatrons and Beam-X > tubes. I've never seen a clock that uses beam switching tubes, and I was > wondering if anyone has any they would be willing to sell. I'll need at > least 4 tubes in total. I'm looking specifically for the following types: > > - BX-2000 > - BX-2004 > - BX-1000 > - (any electrically equivalent tube) > > There is a listing on eBay currently, but the tube in the product image > has a big crack in the top, so that seems like a bit of a gamble. If you > have any and are looking to sell, send me a PM. (Bonus points if you have > the strange 26-pin sockets as well) > -- 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/47601fef-bfbb-495b-8314-bd68d7ff0324n%40googlegroups.com.
