The designation VI103 or Valve Indicating 103, is a UK military type that predates the CV or common Valve naming system introduced in 1941.![](../pics/aaa0732c.jpg)
The VI103 specification is virtually the same as the commercial Y63 in specification.![](../pics/aaa0732a.jpg)
The display electrodes are symmetrical in the classic envelope.The classic envelope is 36 mm in diameter and, excluding the IO base pins, is 87 mm tall.References: Data-sheet, 3002, 1043 & 1040. Type VI103 was first introduced in 1937. See also 1937 adverts. |