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. However, in a small space the sound is excellent.
The blackened anode. The control grid has radiating fins at the top of the supports.
The thin glass tube envelope is 18 mm in diameter and excluding the B7G base pins, is 47 mm long.
References: Data-sheet & 1040. Type EL91 was first introduced in 1949. See also 1949 adverts.
Absolute Maximum Operating Conditions¶
Updated June 30, 2017.