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Experimental Round Radio Valve Type CA, by Ediswan, London, c. 1915
Inventory Number: 24865
Date: c. 1915
Maker Details: Attributed to Ediswan.
Inscription: None
Size: 145 mm in overall height (including base)
Materials: Glass, oxide, brass?, platinum.
Other Given Number(s): Christie's 207.
Notes:
Experimental Round Triode Radio Valve Type CA without heater tip, on brass? bayonet base, with single oxide coated platinum filament. This receiver valve, a variant of Type N, was completely surrounded by a coarse mesh grid and cylindrical anode. The three filament version had a moulded base with four side contacts - one for each filament and one common contact. The tubulation at the top of the valve contained a piece of asbestos that could be heated to release a small amount of gas into the valve to optimise its operation.
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