GS12D (Hivac)
Dekatron style counting tube


Bi-directional double-pulse duodecal (12-position) counting/selector tube.
Neon filled.

The following pictures show the tube spinning.
Of course, only one of the cathodes is glowing, but the opening time of the camera generates different pictures:

a long opening time of the camera:

a short opening time of the camera:

a long opening time of the camera:

by night, with  long opening time of the camera:

An animation of a spinning dekatron:

German English    
Röhrentyp Tube type   GS12D
Hersteller Brand   Hivac
Vergleichstypen Substitutes   -
Zähl-Richtung Counting direction   bidirectional
Arbeitsweise Operation   double pulse
Art Sort   SEL
Sockel Base   B12E + 2 flying leads
Fassung Socket   B12E
Nullposition Zero position   pin10 +6°
Zähl-Schritte Counting steps   12
Anzahl der Hilfskathoden Number of guides   2
Gasfüllung Gas filling   Neon
Röhrendurchmesser maximal Tube diameter max. mm 33,1
Röhrenhöhe maximal Tube height max. mm 88,5
       
max. Zähl-Geschwindigkeit Max. counting speed kHz 4
Betriebsspannung minimal Supply volt. min. V 400
Betriebsspannung typisch Supply volt. typ. V 475
Brennspannung typisch Maintaining voltage typ. V 191
Anoden bzw. Kathodenstrom min. Anode/cath. current min. µA 190
Anoden bzw. Kathodenstrom typ. Anode/cath. current typ. µA 270
Anoden bzw. Kathodenstrom max. Anode/cath. current max. µA 350
Anodenwiderstand typisch Anode resistor typical 910
Spannungsdifferenz zw. 2 Kath. max. Voltage between 2 cathodes max. V 140
Hilfskathodenvorspannnung Impulsbetrieb typ. Guide bias typ pulse op. V 36
Hilfskathodenimpulsspannung Guide signal voltage pulse Vp -145±15
Hilfskathodenimpulsspannung eff. (Sinus) Guide signal voltage eff. (sine) Veff 40-70
Hilfskathodenimpulsdauer minimal Guide signal pulse duration min µs 80
Kathodenwiderstand maximal Cathode resistor max. 270
Ausgangsspannung Output voltage V 35
Resetimpulsspannung Reset pulse voltage min. V -120

Pinout & Outline:

Downloads/Datasheets:

Document #028: Ericsson book "Electronic Counting Circuits" - Dated 1967
File:
Ericsson-Databook.zip

Document #056: ETL datasheet: GS12D tube
File: GS12D.pdf


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