My last two posts in the "Source for Dekatrons" topic has some details on the clock. It uses Russian A101 dekatrons with MOSFETs as interstage couplers. All counting is done by the A101's, there are no integrated circuits. Soon after I posted my clock, this all-vacuum tube clock showed up: http://wv7u.com/cwc/hourglass.html
On Tuesday, March 17, 2015 at 6:15:03 PM UTC-4, Pramanicin wrote: > > That's a beautiful clock Mike. Any documentation anywhere? I've run > ZM1022's for a couple of years with no issues (multiplexed however). I have > no experience with the chinese tubes.... > > On Tue, Mar 17, 2015 at 3:08 PM, Mike Mitchell <[email protected] > <javascript:>> wrote: > >> I'm using SZ-8 nixie tubes in my dekatron-based clock as shown here: >> https://www.youtube.com/watch?v=pK276xZWyo4 >> >> I find I have to replace the nixie tubes more often than I expected. >> Most of the failures are in the '7' digit. The wire from the insulator >> stack to the '7' cathode starts to glow faintly, and brightens over time >> until it is full-on bright and the '7' is not glowing at all. It leaves a >> dark smudge on the glass where the wire sputters away. >> The other failure is with the '1' and '5' digits. They start to glow >> simultaneously, first dimly shadowing each other but again brightening over >> time. >> >> I direct-drive the tubes, with a 170v supply and a 20K anode resistor. >> Individual cathodes of the A101 dekatrons are tied through resistors to the >> base of MPSA42 NPN transistors, the transistors switch the cathodes of the >> SZ-8 nixies. >> >> Should I be using a higher-value anode resistor? Would a different nixie >> (QS30, ZM1022) work more reliably? >> >> Thanks! >> >> -- >> 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] <javascript:>. >> To post to this group, send email to [email protected] >> <javascript:>. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/1b491d6d-0a0e-43b3-b981-0e1ee3c6ac3f%40googlegroups.com >> >> <https://groups.google.com/d/msgid/neonixie-l/1b491d6d-0a0e-43b3-b981-0e1ee3c6ac3f%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/d210d1b2-b361-4dff-b00d-fb1ae5574069%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
