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The VI77 is a magic eye tuning indicator. The prototype was the EM31. Other service names were AW6 and later CV1077.

VI would be an RAF designation and AW the Army designation.

The triode amplifier sits below the display unit.

Thanks to Mark Mallison for sending the images.

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

Reference: Data-sheet.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.