Sensibly equivalent¶ to:
The EL91 is an audio output pentode valve for radio receiver use. In single ended configuration it will produce 1.4 Watts, enough for a receiver.
If used in push pull an output of 4 Watts is possible, but this valve was not expected to be used for hi fi.
Our other EL91 has the later Mullard logo.
Both control and screen grids are supported on copper rods. There is no heat radiating fin connected to the control grid.
The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 48 mm long.
References: Datasheet & 1040. Type EL91 was first introduced in 1949.
Absolute Maximum Operating Conditions¶
Updated November 16, 2015. shape:thin.glass.tube construction:all.glass type:pentode age:1950.1960 base:b7g heater:6.3v pins:7 pin:1.g1 pin:2.k pin:3.h pin:4.h pin:5.a pin:6.ic pin:7.g2