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: neonixie-l@googlegroups.com
[mailto:neonixie-l@googlegroups.com] Namens Duncan Townsend
Verzonden: zondag 21 augustus 2022 17:17
Aan: neonixie-l@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 [
> tubecollectorsassociat...@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: neonixie-l@googlegroups.com [mailto:neonixie-l@googlegroups.com]
> Namens Duncan Townsend
> Verzonden: zondag 21 augustus 2022 3:53
> Aan: n, the eonixi...@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
>
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