Neat picture...

[Bill Notfaded]

I'd like to find one of these... I've seen smaller ones too that are around 2 or 3U before as well.

Bill

[Mac Doktor]

On Jun 2, 2019, at 7:27 PM, Bill Notfaded <notf...@gmail.com> wrote:

I'd like to find one of these... I've seen smaller ones too that are around 2 or 3U before as well.

Want want want

Terry Bowman, KA4HJH
"The Mac Doctor"

[Paolo Cravero]

Well well. That's my picture, from 2017. The guy is in Italy and would ship. Another person was interested in the item and told me some accessories were missing in order to make it functional again.  

Paolo

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[Dekatron42]

It might have been me who was interested in this counter.

I’ve had a few of these in very poor condition, rusty and partly smashed in, but finally got hold of one which I was able to restore to full functionality. I do have the reverse engineered schematics I made then somewhere unless they disappeared in an SSD crash.

To get full functionality you need two small valve based modules that should be put on the front top corner where you can see two black contacts. Without these only some of the functions can be used. You can see one of these modules in one of the photos here: https://www.radiomuseum.org/r/leybold_impuls_zaehlgeraet_55952.html

/Martin

[Bill Notfaded]

Paolo-

Contact me offline if you know the guy and he wants to negotiate.  I live in the desert in southwestern Arizona.  Really neat... you see many tubes for sale but not many counters.  The front looks beat up a little but what could you expect with something that size and age really that's dragged around to radio shows.  My Gmail is pretty easy, has my handle and a number 1.

Best Regards,

Bill aka notfaded1

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[Bill Notfaded]

It looks like someone swiped the dekatrons out of the one pictured first on radiomuseum but then they show it with them installed with the module... nice.

Bill

[Dekatron42]

It might have been one of those in need of restoration. I replaced the electrolytic capacitors and some other high voltage types as they had cracked plastic. I also had to replace a few damaged resistors and find out where some broken wires had been soldered originally.

I've included the reverse-engineered schematic diagram that I made while restoring the one counter that was good enough to restore, unfortunately I never found the two modules but got in contact with a gentleman who had them and made reverse-engineered schematic diagrams with his help, you can see what the modules look like in the photo (has lost his contact details since then) -  now, since these are reverse-engineered schematic diagrams they might contains errors but they were good enough for me to repair a damaged counter with. I also included a scan of the physics experiment manual for these.

If you buy one, ask the seller to remove the Dekatrons before shipping as they sit really tight in the front panel and easily break if the unit is dropped hard.

/Martin

[Bill Notfaded]

Thanks Martin that's a huge help.  I wonder what the thinking behind those modules was originally... we may never know.

[Dekatron42]

Those modules where used for time-measurements where the mono-bi-mono module 55970 started and stopped the counting (page 10-19) and the second module (55971) was used for rate-meter counting (page 26-28 in the manual).

/Martin

[Bill Notfaded]

I see it now... did you just put some parts on small project board and attach to the front or put it inside?  At least the German is a little easier to translate than the Russian stuff.  I was looking at the instructions for a Russian Dekatron spinner I got in the mail this weekend and geesh I thought I'd be able to basically make most of it out from the numbers and, hopefully, pictures but alas that's not going to work.  I'm thinking scan it OCR it and then feed into a decent translator.  I figured out that it takes 12VDC at least.  From the original pictures I wasn't sure if it was a line voltage design or what lolol.  The guy did email me in english at least and it shipped with an OG-4.

Bill

[Bill Notfaded]

Is that a tuning fork and microphone on those pages Martin in the diagram with the attachments?

[Dekatron42]

Yes. These were used in schools for physics experiments.

I included an OCR version of the manual

/Martin