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ID = 31306
Tube type:  Voltage Regulator, single   Power-supply 
Identical to 5644 = M8216 = CV3987
First Source (s)
12.Apr.1950 : Electron Tube Registration List

Base Subminiatur-8, with space 1/8, B8D
Filament No heater

90V 5-25mA. T3 bulb with flying leads.
Mullard, Raytheon and Sylvania known manufacturers.

Information source - - Manufacturers Literature   
Tube Lore (I)   
5644: foto personal de una valvula de mi coleccion
Tomas Montero-Molinero

5644: Manufacturer's Literature
Emilio Ciardiello

5644: Manufacturer's Literature
Emilio Ciardiello

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from Just Qvigstad

Usage in Models 1= 1951?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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