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ID = 28784
Great Britain (UK)
Developer: Metropolitan-Vickers (Metro-Vick, Cosmos); GB 
Tube type:  Triode, vacuum   Power/Output 
Identical to SP55/R = AML.6/25
Similar Tubes
Other characteristic (electr. data):
First year 1926 Saga of the Vacuum Tube, Tyne page 373

Base Europe 4-Pin B4 (Eu A, E, 4A) 1914
Was used by Radio/TV-reception etc.
Filament Vf 6 Volts / Direct / Battery =

Red Spot.Story of Cosmos valves see here

Text in other languages (may differ)
Information source History of the British Radio Valve to 1940   p.161

b4_base_pins~~549.png SP55/R: Fin Stewart
Fin Stewart

Just Qvigstad
Usage in Models 1= 1926

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

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