The CV1166 is a directly heated triode that was used under their own designations by several of the UK services. It was called:- NR42, AR5, VR22, POVT140 as well as the prototype the commercial LP2.
The metal strips at the top grip the glass walls and thus hold the electrode system rigid.
The oxide coated filament is formed as a pair of hairpins. The upper mica holds the tensioning springs with hooks at the base.The wide glass tube envelope is 28 mm in diameter and, excluding the B4 base pins, is 86 mm tall.Reference: Data-sheet. |