Antique radios, Old Time Radios

B438

ID = 2475

Country:

Netherlands

Brand:	Philips; Eindhoven (tubes international!); Miniwatt
Developer:	Philips; Eindhoven (tubes international!); Miniwatt
Tube type:	Triode, vacuum
	Ca. 1925 up to 1945 rare.

Identical to

B438 = W410

Similar Tubes

Normally replaceable-slightly different:

2-438 ; 4B3_Ultron ; A4_Zenith ; M350S ; M504 ; W420

Other base:

B438_UX4

First year

1927 Tube leaflet collection E.Erb Analysis by original leaflets

Base	Europe 4-Pin B4 (Eu A, E, 4A) 1914 (Codex=Eo)
Filament	Vf 4 Volts / If 0.1 Ampere / Direct
Dimensions (WHD) incl. pins / tip	45 x 100 x 35 mm / 1.77 x 3.94 x 1.38 inch
Information source	- - Manufacturers Literature Taschenbuch zum Röhren-Codex 1948/49

B438: John Koster
John Koster

B438: Telefunken Werkstattbuch
Wolfgang Bauer

B438: RVF-Röhrenbuch-M1,1947
Anonymous 15 Collector

from Just Qvigstad

Usage in Models

1= 1928?? ; 1= 1930?? ; 2= 1930 ; 2= 1931? ; 7= 1931 ; 1= 1932?? ; 1= 1932 ; 1= 1933? ; 1= 1933 ; 1= 1936?? ; 1= 1937? ; 1= 1938?? ; 1= 1940??

Quantity of Models at Radiomuseum.org with this tube (valve, valves, valvola, valvole, válvula, lampe):21

Collection of Ernst Röggla (I)

Collection of John Koster (NL)

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