MCD0X 4I (Valvo/Philips)
Nixie Röhre/Nixie Tube

The tubes were made for TV channel displays in the "good old times" - basically the tube is a simplfied ZM1000/1005 with only numerals 1-8 in some OCR shape. If you look at the base of Valvo/Philips (probably Amperex too) ZM1000s you will see some triangle + number + letter (like 6B or such). These triangles show up on the "MCD0X" marked tubes too - but they have no "official designation" nor a manufacturer stamped on the envelope. So they are just "OEM-Nixies" for a special purpose. In Germany Nordmende and Telefunken used them a lot AFAIK.

The code is read MCD - "zero" - X. the tube-code is "MCD" and the trailing (one, two or three) digits give a subtype code, which is *usually* "0X" (zero, x) for the generic OCR-like 1-8 digit Nixies.
Other examples are "MBT" for a ZM1000 or "MGM" on ZM1005. The second half is for instance "1TT" on ZM1000 with the sheetmetal-getter and "3TT" with those that have the getter ring. It is like a "family" - "subtype" coding.

Röhrendaten/Tube Data
German English    
Typ Type   MCD0X 4I
Hersteller Brand   Valvo/Philips
Vergleichstypen Substitutes   alle MUD-Typen, alle MRL-Typen, alle MTC-Typen, ZM1012, ZM1015/
all MUD-types, all MRL-types, all MTC-types, ZM1012, ZM1015
Symbole Displayed symbols   1-8, PL, PR
Symbolhöhe Symbol height   14mm (0.55")
Abmessungen Overall dimensions   19mm (0.75") dia. X 45.1mm (1.78") tall
Pindurchmesser Pin diameter   0.6mm (0.025")
min. Betriebsspannung min. supply voltage V 170
typ. Brennspannung typ. maintaining Voltage V 140
Betriebs-Kathodenstrom Typical cathode current mA 2.5
Sockel Base   Euro Grid, Pin 1 und 10 vorne/
Euro Grid, pin 1 and 10 at front
Fassung Socket   Euro Grid


Pin Anschluss/
1 Cathode (1)
2 Cathode (2)
3 Cathode (3)
4 Cathode (4)
5 Cathode (5)
6 Cathode (6)
7 Cathode (7)
8 internal connection
9 internal connection
10 Cathode (8)
11 internal connection
12 Cathode (PR)
13 Anode
14 Anode
15 Cathode (PL)
16 internal connection

(Pinout graphic by Alan Franzman)
Ansicht von unten/Bottom view
Pfeil zeigt Blickrichtung/Arrow shows direction of viewing!


Dimensions in mm!

Sie möchten sich die Fassungen lieber selbst herstellen? - kein Problem, verwenden Sie handelsübliche Buchsenleisten zur Aufnahme von 0.6mm Pins.
You like to make the sockets by yourself? - No problem! Use standard connector posts.

Self made socket: Original socket:


Sie finden passende Datenblätter im Datenblattarchiv.
Suchen sie dort nach dieser Type und deren Vergleichstypen.

You'll find the matching datasheets in the datasheet archive.
Search for this type and its substitutes there.

Back to Dieter's Nixie Tube Page

eMail to Dieter
Impressum & Datenschutz