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ID = 19510
Great Britain (UK)
Tube type:  Triode, vacuum   Universal 
Identical to SP18/G
Similar Tubes
Normally replaceable-slightly different:
  SP18 ; SP18/B
Other characteristic (electr. data):
First year 1925 Saga of the Vacuumtube, Tyne page 373
First Source (s)
1925 : British Radio Valves - The Vintage Years, Thrower p.47

Base Europe 4-Pin (A, 4A, B4, since 1914)
Was used by Radio/TV-reception etc.
Filament Vf 1.8 Volts / If 0.3 Ampere / Direct / Battery =

Shortpath is a Cosmos brand, see Keith R. Thrower, British Radio Valves, page 48. Probably an anglicised version of the WD11 from the USA.

According to Tyne (pp.373, 374) there are three variants:
- SP18/B
- SP18/G
- SP18/R
in the Benjamin Catalog all SP18 are tubular, although Tyne shows an SP18/G having a globe shape. Error?

The SP18 without dot or suffix (B, G, R) is definitely existing (see photo)

Story of Cosmos valves see here

Text in other languages (may differ)
Literature 70 Years of Radiotubes and V.   p.196
Saga of the Vacuumtube, Tyne   p.373
SP18/G: Fin Stewart
Fin Stewart


Usage in Models 1= 1926

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

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