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The CV1743 is a protective spark gap. No specific operating details have been found as yet.

The KB/SL identifies this valve as being made to specification K1001 or K1006, the B denotes qualification by a UK authority and the SL identifies the maker as AEI, Leicester.

Inside the glass is a ceramic cylinder and on the glass is L1059.

The wide glass tube envelope is 30 mm in diameter and, excluding the IO base pins, is 58 mm tall.

Reference: Observation.