Funkwerk Erfurt Zähldekade Typ 8101 (Decadic Counter)

[Oskar]

I recently acquired this large 1MHz decadic counting unit but haven't been able to find any datasheets for it. If anyone has information on how to get it working, I'd really appreciate the help.

/Oskar

[Instrument Resources of America]

I'm quite sure that it is out of a frequency counter. Probably the least significant digit (LSD) or second least significant digit. You might try looking at the old Hewlett Packard model 524 frequency counter. I  think you find it quite similar.

Good luck,  Irv.

On 11/12/2025 3:58 PM, 'Oskar' via neonixie-l wrote:

I recently acquired this large 1MHz decadic counting unit but haven't been able to find any datasheets for it. If anyone has information on how to get it working, I'd really appreciate the help.

/Oskar

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[Instrument Resources of America]

P.S. This item is a very 'small' part of the entire counter.

Irv.

On 11/12/2025 3:58 PM, 'Oskar' via neonixie-l wrote:

I recently acquired this large 1MHz decadic counting unit but haven't been able to find any datasheets for it. If anyone has information on how to get it working, I'd really appreciate the help.

/Oskar

[goo...@sl.ar.lt]

> P.S. This item is a very 'small' part of the entire counter.

I understand that. I was hoping to just get it running on itself. Thanks for the recommendation. I will have a look.

Am 13.11.2025 02:17 schrieb "Instrument Resources of America - IRACOSALES at hughes.net" <iracosales_at_hu...@simplelogin.co>:

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[Rob B]

Could it have come from the FE 3501 or 3504, pictured on this page?:

https://www.elektromuseum.de/wissen-funkwerk-frequenz-zeit.html

[Mac Doktor]

On Nov 13, 2025, at 5:03 PM, Rob B <bailey...@gmail.com> wrote:

Could it have come from the FE 3501 or 3504, pictured on this page?:

https://www.elektromuseum.de/wissen-funkwerk-frequenz-zeit.html

The columns are about twice as far apart as the Burroughs counters so it looks right.

Terry Bowman, KA4HJH
"The Mac Doctor"

https://www.astarcloseup.com

"If only you could see what I've seen with your eyes."—Roy Batty, Blade Runner

[J Forbes]

there is a little bit of info here

https://selectric.org/tubeclock/index.html

about using similar modules in a clock. The "normal decade" is the schematic of a single stage counter/display, so it should be similar to the half of your module that has the neon lamps. I suspect the other half is similar, but without the lamps. 

There is an HP manual on the internet that describes how they work...

https://hparchive.com/Manuals/HP-AC-4A-4B-Manual.pdf

see how far that gets you