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ID = 28783
Great Britain (UK)
Developer: Metropolitan-Vickers (Metro-Vick, Cosmos); GB 
Tube type:  Triode, vacuum   Universal 
Identical to SP55/B
Similar Tubes
Other characteristic (electr. data):
First year 1925 Saga of the Vacuumtube, Tyne page 373, 374

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

Blue Spot "Shortpath"

Story of Cosmos valves see here


Usage in Models 1= 1926

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

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