Good morning, I have nothing of any note to trade but would be interested in purchasing some of your large VFD's/ I am in the UK, please let me know if you would be happy to ship there and if so, what you would like to sell some for? - RIchard
On Sunday, 21 August 2022 at 22:56:34 UTC+1 dunc...@gmail.com wrote: > Martin: I'd never heard of pandicon tubes before! That's so cool! Driving > them seems like a real pain, though, what with all the mandatory > multiplexing going on. Probably less of a pain if you're willing to use a > microcontroller? I would love to see some of your work, if you have a > link. > > One of Dance's chapters is about beam switching/trochotron counting > circuits, so I'm already stealing wholesale from that to build a clock. > > Eric: when I was investigating options for my tuning fork timebase, I came > across a plethora of vacuum tube quartz crystals in the low-hundreds to > tens of kilohertz range. Of course, they're pretty old and probably have > poor temperature compensation, but it would solve your frequency problem > without "cheating". I've also seen some people using astable > multivibrators as frequency dividers, but by all accounts they're fiddly > beasts. > > --Duncan > > On Sun, 21 Aug 2022, Tidak Ada wrote: > > > Hi Duncan, > > > > I have some Elesta EZ10 A/B tubes (1MHz resp. 500kHz) that could do the > > job if I can get the MHz of the 4MHz TCXO at 400kHz in a 'fair' way. > > There must be a way using heterodyne mixing, but that goes beyond my > > technical knowledge. HP used the technology in some counters in their > > early years. > > The trouble is that the EZ10A is a hydrogen filled tube. Hydrogen > > diffuses through glass, so there is a good chance that the tube is dead. > > > > Another less fair way is to use (High levl)TTL or CMOS chips there. > > After all, the TCXO is also a semiconductor oscillator. > > > > The lower frequencies have to be divided by some Sylvania 6879 dekatrons. > > The display part should exist by a GS12C, GS12D and GC12/4B and some > > 10-counters from the Ericsson house. > > > > I am at the level to set up a test circuit for the Elesta's, but time > and age are the bottlenecks. > > Anyhow, I like to save some of the Elesta's for my tube collection. > > Another guy who may be able to help you is Graham McGuire, also a > Neonixie-L member > > > > Cheers, > > eric > > > > > > > > > > > > -----Oorspronkelijk bericht----- Van: neoni...@googlegroups.com [mailto: > neoni...@googlegroups.com] Namens Duncan Townsend > > Verzonden: zondag 21 augustus 2022 17:17 > > Aan: neoni...@googlegroups.com > > Onderwerp: RE: [neonixie-l] Self-introduction & tube trading > > > > Thanks for the warm welcome! > > > > Michail: part of the challenge for the 1j24b CPU is to build the whole > thing without any silicon. Building the muxing and decoding circuitry for > the 5971s without using a PIC is part of the fun! Of course, sourcing > high-voltage germanium diodes is a slog. > > > > eric: I had read Joe's research radiomuseum.org but did not know that > we shared an _alma mater_. Thanks for the connection and the pointer to > tubecollectorsassociation! Re: quartz oscillators, how did you get the > frequency down into the dekatron range? IIRC, most dekatrons don't work > until you're down in the tens of kilohertz. > > > > --Duncan > > > > P.S. correction to my original email: I have a large quantity of ILC1 > 1/7 VFDs not ICL1 1/7. > > > > On Sun, 21 Aug 2022, Tidak Ada wrote: > > > >> Hello Duncan, > >> > >> Interesting projects. > >> > >> About those Russian rod-gridded tubes I will refer you to TCA-member [ > >> tubecollecto...@groups.io ] Joe Sousa (MIT). He did a lot of > >> research on these tubes. His reports are also published at > >> Radiomuseum.org [ > >> https://duckduckgo.com/?q=radiomuseum.org+english+language&hps=1&atb=v > >> 261-1&ia=web > >> ] > >> > >> I had plans for a clock with moving coil meter readouts, but I stopped > after calculating the power consumption of the project. > >> Intention was to start with a TC X-tal oscillator (400kHz) then count > down with dekatrons to the 0,1Hz region. Then a clock counter with a D/A > converter to the meters. > >> > >> Unfortunately, the power consumption is irresponsible, especially in > this time of scarcity and hi prices in Europe. > >> > >> Success! > >> eric (Tidak Ada) > >> > >> -----Oorspronkelijk bericht----- > >> Van: neoni...@googlegroups.com [mailto:neoni...@googlegroups.com] > >> Namens Duncan Townsend > >> Verzonden: zondag 21 augustus 2022 3:53 > >> Aan: n, the eoni...@googlegroups.com > >> Onderwerp: [neonixie-l] Self-introduction & tube trading > >> > >> Hello everybody! > >> > >> I'm Duncan, an American software engineer by day and vacuum tube > enthusiast when I'm not distracted by other things. I have an unreasonable > number of pokers in the fire right now, but they include: > >> > >> * a clock based on each of J.B. Dance's Electronic Counting Circuits > >> chapters (how low can I get the active part count without involving > >> silicon components?) > >> * tuning fork timebase for the above clocks > >> * 1j24b (Russian subminiature rod pentode) CPU > >> * 1j25r (even smaller than 1j24b) headphone amplifier > >> > >> In particular, I'm interested in hearing from the experts what kind of > fun tube-based displays I might've overlooked for the 1j24b CPU. My current > plan is 5971 13-segment tubes (I'm too poor for that many 7971s), but I > don't really know what's out there. > >> > >> === > >> > >> I'm also interested in trading to get some of the tubes I admire for > >> their aesthetics. I consider the National NL-90X series (NL-900 no > >> decimal, > >> NL-901 left decimal, NL-902 right decimal, NL-908 both decimals) as > >> well as the Ericsson GR10N tubes some of the most beautiful ever > >> manufactured and would love to trade for/buy some. I have a large > >> number of enormous > >> ICL1-1/7 VFDs as well as some tiny National NL-4998 nixies for trade. > >> I also have the above mentioned sub-subminiature Russian tubes (1c38a > >> triode, 1c38a-q Chinese variant triode, 1j25r pentodes, and tg5r > >> thyratron) as well as their slightly less sub- brethren (1c1a triode, > 06p1a pentode, 1t1a thyratron) for anyone who wants to build out their > collection of oddities. > >> > >> --Duncan > >> > >> -- > >> 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/spqo062-194q-76qo-68no-q4338r4sp2o8%40qhapnapzg.pbz > . > >> > >> -- > >> 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/!%26!AAAAAAAAAAAYAAAAAAAAAPDddShx705MuX20yCpp0vvCgAAAEAAAAMnEwcGcbA5PtDhA%2B8agO1QBAAAAAA%3D%3D%40zeelandnet.nl > . > >> > >> > > > > -- > > 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/rpsr142-3ps-9827-819r-2o4848n45p3%40qhapnapzg.pbz > . > > > > -- > > 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/!%26!AAAAAAAAAAAYAAAAAAAAAPDddShx705MuX20yCpp0vvCgAAAEAAAAAL7lOk7lYJIrp/iabOBWNUBAAAAAA%3D%3D%40zeelandnet.nl > . > > > > > -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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