The EH90 is an indirectly heated heptode frequency changer designed for dual standard television sets in the early 1960's. The EH90 was used as an FM demodulator for the 6 MHz inter-carrier sound of the UK PAL service. See the Mullard EH90 for more details.
ITT acquired the German Lorenz company.
The anode cover most of the internal structure. The control grid is wound on copper supports and the two screening grids are bridged at the top.
The lower mica and base.
The thin glass tube envelope is 17 mm in diameter, and excluding the B7G base pins is 47 mm tall.
References: Data-sheet and 'Mullard Outlook', Vol. 12, No. 7, December 1962. Type EH90 was first introduced in 1954. See also1954 adverts.
