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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 3 pin wires in line (1937, B3G) Wires only.
Was used by Radio/TV-reception etc.
Filament Vf 4 Volts / If 0.2 Ampere / Indirect / Specified current AC/DC ~ = (Series working)

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)
Dimensions (WHD)
incl. pins / tip
x 46 x 11 mm / x 1.81 x 0.43 inch
Weight 10 g / 0.35 oz
Information source - - Manufacturers Literature   Ediswan Mazda Valves 1949-1950 catalog
Universal Vade-Mecum, Electron Valves and Semiconductor Devices   Section 69, p. 94
D1_Mazda_GB: R.Osterkamp
Rudolf Osterkamp

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D1_Mazda_GB: U.G.
Urs Gloor

D1_Mazda_GB: Original data sheet
Otto Galli

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from Just Qvigstad

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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