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ID = 21480
Brand: La Radiotechnique (RT); Paris, Suresnes
Developer: Dario (tubes) - voir aussi La Radiotechnique 
Tube type:  Dual-Grid Tetrode   Frequency converter 
Identical to Micro-Bigril_R43 = Micro-Bigril = R43
Similar Tubes
Normally replaceable-slightly different:
First year 1925 Saga of the Vacuum Tube, Tyne page 402

Base Europe "B5 big size" (D, Bigrille)
Filament Vf 4 Volts / If 0.08 Ampere / Direct / Battery =

Tyne: "Double-grid tubes came on the French market in 1924. At first they had tungsten filaments. By 1925 they were superseded by the dull-emitter version, space-charge rather than shield-grid tubes, and were first used in receivers at low anode voltage. Later they were used as frequency changers in superheterodynes. Examples of these are Métal's DG and RM, La Readiotechniaue's Micro-Bigril R43, and Grammont's Bigrille-Ampli and Bigrille BF." [EE]

  Micro-Bigril_R43: W.H.
Wolfgang Holtmann
Micro-Bigril_R43: Eigene Sammlung
Albert Vonarburg

Micro-Bigril_R43: W.H.
Wolfgang Holtmann

Micro-Bigril_R43: Banneitz, TB der drahtl. Teleph. 1927
Anonymous 15 Collector

You reach this tube or valve page from a search after clicking the "tubes" tab or by clicking a tube on a radio model page. You will find thousands of tubes or valves with interesting links. You even can look up radio models with a certain tube line up. [rmxtube-en]