This tube was made with either a European B4 base or an Edison E12 base (the measurements above are for a tube with E12 base). In the latter case, the plate and grid connections were from wire leads on the top of the bulb. First made by Osram GEC June 1917. Two tubes are known to exist where the E12 base is in place but was not used.
Dimensioni (LxAxP) incl.pins/tip
x 86 x 50 mm / x 3.39 x 1.97 inch
Peso
33 g / 1.16 oz
Bibliografia
Saga of the Vacuum Tube, Tyne page 380
- - Manufacturers Literature Gec cat. about 1924
- - Manufacturers Literature
