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 [
[email protected] ] 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=v261-1&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: [email protected] [mailto:[email protected]] Namens
Duncan Townsend
Verzonden: zondag 21 augustus 2022 3:53
Aan: n, the [email protected]
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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