The CV1988 is the UK government Common Valve version of the 6SN7GT double triode valve. Each half of the valve is electrically equal to the 6J5 triode.
The twin rectifier sections with stitched anodes. The heaters are connected in parallel.
Anode side view.
The wide glass tube envelope is 28 mm in diameter and, excluding the IO base pins, is 68 mm tall.
References: Data-sheet, 1040 & 1043. Type CV1988 was first introduced in 1941. See also1941 adverts.
