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ID = 31318
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Beam Switching Tube - incl. "Trochotron" 
Identical to ET51 = CV5277
Similar Tubes
Normally replaceable-slightly different:
  6700 ; MO-10
First Source (s)
Mar.1960 : - - Manufacturers Literature Preliminary Data Sheet

Filament Vf 6.3 Volts / If 0.3 Ampere / Indirect / Specified voltage AC/DC

Base B26A. Thermionic Decade Counting Tube which predates the gas-filled "dekatron" tubes.
Consisting of 30 electrodes the electron beam is steered with an external magnetic field. Counting speeds up to 1 MHz are attainable. Tubes had to be mounted at least 10 cm apart. This and the high cost of manufacture together with the advent of the dekatron made the use of the Trochotron not viable except for high speed counting. (RJ)
Operating principle of trochotron.

Dimensions (WHD)
incl. pins / tip
41 x 84 x mm / 1.61 x 3.31 x inch
Information source - - Manufacturers Literature   
ET51: Private collection
Emilio Ciardiello

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ET51: Mullard
Günther Stabe † 19.8.20

ET51: Manufacturer's Literature
Emilio Ciardiello

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