In message <65AECDF1F89AD411900400508BFC869F9C03BF@pdw-mail-
1.dera.gov.uk>, Talbot Andrew <[email protected]> writes

Sorry, I confused you all and remembered the wrong device.  The valves
are E55L Pentodes.   (E88CC is a doube triode, sort of ECC88 then they
ran out of numbers! )

IIRC The E88CC was a reliable form of the ECC88, gold-plated everything.
Quite common in TV B/C in the 60s.

Mike
--
M.J.Powell