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ID = 22590
Great Britain (UK)
Brand: Mazda = Valve (Tube) brand GB (see also France)
Tube type:  Signal Diode - one single system   Detector 
Identical to D1_Mazda_GB
Similar Tubes
Normally replaceable-slightly different:
  2B36 ; QF196
Different maximum ratings:
  CV1078 ; VR78
Heater and shape different:
First year 1937 ? -- Collector info (Sammler)

Base Wires only
Filament Vf 4 Volts / If 0.2 Ampere / Indirect

The Mazda D1 was the world's first miniature valve with an indirectly heated cathode. It was the basis for the EA50. Originally designed for TV use, the D1 was used in parallel as the switches in the duplexing system of Type 79B, and subsequently Type 281 radars. The Mazda D1 was also used in receivers at up to 100MHz.

Text in other languages (may differ)
D1_Mazda_GB: R.Osterkamp
Rudolf Osterkamp

D1_Mazda_GB: U.G.
Urs Gloor

D1_Mazda_GB: Original data sheet
Otto Galli

Usage in Models 6= 1948 ; 8= 1949?

Quantity of Models at with this tube (valve, valves, valvola, valvole, válvula, lampe):14

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