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SP18/R

Information - Help 
ID = 19511
       
Country:
Great Britain (UK)
Brand:
Developer: Metropolitan-Vickers (Metro-Vick, Cosmos); GB 
Tube type:  Triode, vacuum   Power/Output 
Identical to SP18/R
Similar Tubes
Normally replaceable-slightly different:
  SP18
Other characteristic (electr. data):
  SP18/B ; SP18/G
First year 1925 Saga of the Vacuumtube, Tyne page 373

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 =
Description

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)
 
sp18redcosmos_1_klein_klein.jpg
SP18/R
Geri Meier

 

Usage in Models 1= 1926

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


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