Sensibly equivalent¶ to:
Type 9003 is electrically equivalent to 'acorn' type 956 but re-engineered to B7G dimensions. The valve is classed as a vari-mu UHF receiving pentode.
The design dates to 1943 but B7G based valves were not made in the UK until the late 1940's.
Visually it can be seen that inside the miniature envelope there is a small volume taken up with the electrode assembly.
The thin glass tube envelope is 17 mm in diameter and, excluding the B7G base pins, is 36 mm tall.
Reference: Datasheet. Type 9003 was first introduced in 1943.
Absolute Maximum Operating Conditions¶
Updated April 17, 2014. shape:thin.glass.tube construction:all.glass type:pentode age:1940.1950 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k pin:3.h pin:4.h pin:5.a pin:6.g2 pin:7.k.g3.s