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ID = 3850
Great Britain (UK)
Brand: MO Valve Co. Ltd.; GB
Tube type:  Vacuum Pentode   Power/Output 
Identical to PT4
Similar Tubes
Normally replaceable-slightly different:
  4PenAAC ; 4PenM ; PT4N ; Pen4VB ; PenA4
Heater different:
Multiple differences or of other kind:

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 1.1 Ampere / Direct / Specified voltage AC/DC

The tube was re-designed in 1932 to have a heater current of 1A.

Information source Taschenbuch zum Röhren-Codex 1948/49   
PT4: Auction site Marktplaats.
John Koster

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PT4: rtt
Anonymous 10 Collector

PT4: Marconi Datasheet
Georg Richter

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from Just Qvigstad

Usage in Models 1= 1930 ; 1= 1931?? ; 13= 1931 ; 2= 1932? ; 8= 1932 ; 2= 1933 ; 1= 1935?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):28

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