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ID = 2451
Brand: Philips; Eindhoven (tubes international!); Miniwatt
Developer: Philips; Eindhoven (tubes international!); Miniwatt 
Tube type:  Triode, vacuum 
  Ca. 1925 up to 1945 rare.
Identical to A414K
First year 1928 Tube leaflet collection E.Erb Analysis by original leaflets

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.08 Ampere / Direct / Battery =

Detector and LF amplification.

Dimensions (WHD)
incl. pins / tip
44 x 94 x 35 mm / 1.73 x 3.70 x 1.38 inch
Weight 99 g / 3.49 oz
Information source - - Manufacturers Literature   Tarif des Miniwatts
Taschenbuch zum Röhren-Codex 1948/49   
A414K: Collection TL
Thomas Lebeth

A414K: Telefunken Werkstattbuch
Wolfgang Bauer

A414K: own collection
Peter den Boer

from Just Qvigstad

Usage in Models 1= 1930? ; 1= 1931

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):2

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