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ID = 3847
Great Britain (UK)
Brand: Hivac Ltd.; Harrow-on-the-Hill
Tube type:  Vacuum Pentode   Power/Output 
Identical to Y220
Similar Tubes
Normally replaceable-slightly different:

Base Europe 5-Pin , B5 (Eu O, F, O5A) 1928 (Codex=Foo)
Was used by Radio/TV-reception etc.
Filament Vf 2 Volts / If 0.2 Ampere / Direct / Battery =

Employs the Harries critically-spaced anode geometry.

Text in other languages (may differ)
Information source History of the British Radio Valve to 1940   p. 186
Taschenbuch zum Röhren-Codex 1948/49   
Y220: R.O.
Rudolf Osterkamp

Y220: Telefunken Werkstattbuch
Wolfgang Bauer

Y220: Wireless World
David Andrews

from Just Qvigstad

Usage in Models 1= 1935 ; 1= 1936? ; 1= 1937

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):3

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