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The 6977 is a sub-miniature indicator designed for computer applications.

The anode is a wire wound grid coated with a phosphor that gives a bright blue-green glow. The intensity of the display is proportional to the anode current.

The phosphor coated wound anode.

The thin glass tube envelope is 5 mm in diameter, and excluding the base wires is 27 mm tall.

References: Data-sheet & ³⁰⁰². Type 6977 was first introduced in 1957. See also 1957 adverts.

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.