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ID = 19761
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum 
  Ca. 1925 up to 1945 rare.
Identical to A110 = PR31_Pope = PR31_Condor
Similar Tubes
Normally replaceable-slightly different:
  A106 ; A109
Other base:

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 1.2 Volts / If 0.06 Ampere / Direct / Battery =
Description HF and LF amplification, detection. 
Dimensions (WHD)
incl. pins / tip
42 x 88 x 29 mm / 1.65 x 3.46 x 1.14 inch
Weight 33 g / 1.16 oz
Information source - - Manufacturers Literature   784H 1-8-1925
A110: RMG
Robert Gillespie

More ...
A110: Telefunken Werkstattbuch
Wolfgang Bauer

A110: own collection
Peter den Boer

More ...

from Just Qvigstad

Usage in Models 3= 1925

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

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