Sensibly equivalent¶ to:
The 1AJ4 is an amplifier pentode for use in battery portable radio equipment, mainly domestic broadcast receivers. The 25 mA filament was introduced to improve battery life.
The 1AJ4 is a true pentode with three wire grids. The single strand coated filament runs centrally through the valve. The tension spring can be seen at the top of the valve.
The thin glass tube envelope is 18 mm in diameter and, excluding the B7G base pins, is 47 mm tall.
References: Data-sheet. Type 1AJ4 was first introduced in 1953.
Absolute Maximum Operating Conditions¶
Updated December14, 2015. shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b7g heater:1.4v pins:7 pin:1.f-.g3 pin:2.a pin:3.g2 pin:4.ic pin:5.f-.g3 pin:6.g1 pin:7.f+