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ID = 4024
Great Britain (UK)
Brand: Mullard Radio Valve Co. Ltd.;
Tube type:  Screen-grid Tetrode   Audio Frequency 
Identical to DAS1
Similar Tubes
Normally replaceable-slightly different:
First year Aug.1938 The Wireless World, London (WW, 79) Show announcement
First Source (s)
1938 : - - Manufacturers Literature

Base SPECIAL TUBEBASE in general (Codex=Sp 25) Top contact with a cap
Filament Vf 2 Volts / If 0.06 Ampere / Direct / Battery =
For deaf aid use. gm = 0.58mA/V 
Text in other languages (may differ)
Dimensions (WHD)
incl. pins / tip
16 x 69 x mm / 0.63 x 2.72 x inch
Information source Taschenbuch zum Röhren-Codex 1948/49   
DAS1: G.S.
Günther Stabe

DAS1: G.S.
Günther Stabe

DAS1: Original Data Sheet
Hermann Fleischanderl

Usage in Models 1= 1943?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):1

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