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ID = 50042
Great Britain (UK)
Tube type:  Triode, vacuum   Universal 
  Ca. 1925 up to 1945 rare.
Identical to SP18/B
Similar Tubes
Normally replaceable-slightly different:
  SP18 ; SP18/G
Other characteristic (electr. data):

Base Europe 4-Pin B4 (Eu A, E, 4A) 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)
Information source 70 Years of Radiotubes and V.   p.196
History of the British Radio Valve to 1940   p.161
Alan Scott Douglas † 16.11.15

More ...
SP18/B: Fin Stewart
Fin Stewart


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