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ID = 21243
Great Britain (UK)
Brand: Standard Telephones and Cables Ltd. (STC); London, Foots Cray
Tube type:  Triode, vacuum   Audio Frequency 
Identical to 4D1_Brimar = VR109 = CV1109
Similar Tubes
Normally replaceable-slightly different:
  HL1320 ; VT100B_GPO
First year 1935 The Wireless World, London (WW, 79)

Base British-7-Pin, old (M7A)
Filament Vf 13 Volts / If 0.2 Ampere / Indirect / Parallel / series AC/DC

This is normally issued in the Brimar brand - like probably all valves from Standard (STC) for radio valves. The valve 4D1 is listed in the documentation "Trader Service Sheets" Number 121 (The Wireless Trader) , issued July 4, 1936 for Kolster-Brandes model 515.

4D1_Brimar: Photo of tube from my collection - TS
Tomasz Szczesniak

4D1_Brimar: Tabu Röhren-Codex, 1948
Anonymous 15 Collector

4D1_Brimar: Babani 1949-1951
Patrice Zeissloff

Usage in Models 1= 1936? ; 2= 1936

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

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