Current record mode: basic


100 of 655 records      previous / next

Experimental Round Radio Valve Type CA, by Ediswan, London, c. 1915

Inventory Number: 24865

24865-1t 24865-2t

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.


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.

100 of 655 records      previous / next

Record mode: Basic | Medium Images | Large Images | Documents (2)