The ECF82 is a high slope triode pentode designed for television use as a frequency changer or mixer. It was also found to be effective as an audio phase splitter and used by Radford.
Bentley is a re-seller.
Ever seen a valve marked 'rubbish'.
The triode on the right with the pentode at right angles.
The 'pentode' is made as a beam tetrode.
The thin glass tube envelope is 21 mm in diameter, and excluding the B9A base pins is 49 mm tall.
References: Data-sheet & 1040 Type ECF82 was first introduced in 1953. See also1953 adverts.
