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ID = 4022
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Triode, vacuum   Audio Frequency 
Identical to DA1
Similar Tubes
Normally replaceable-slightly different:
Other characteristic (electr. data):
First Source (s)
Apr.1936 : - - Manufacturers Literature

Base Midget 4 pin Hivac (Sm4) (Codex=Sp 26)
Filament Vf 2 Volts / If 0.05 Ampere / Direct / Battery =

B4A base (one thick pin)

Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
18 x 59 x mm / 0.71 x 2.32 x inch
Information source Taschenbuch zum Röhren-Codex 1948/49   
DA1: G.S.
Günther Stabe † 19.8.20

DA1: Telefunken Werkstattbuch
Wolfgang Bauer

DA1: Mullard Valves 1936
Peter Hoddow

from Just Qvigstad

Usage in Models 2= 1937?? ; 1= 1943? ; 1= 1959

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):4

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