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The Ever Ready K80A is a battery Octode frequency changer. The valve was made my Mullard under contract and internally is a Mullard FC2.

The K80A has the Mullard gold coloured zinc screening paint.

The B7 Base pins.

Thanks to Mark Mallison for sending the images.

The classic envelope is  mm in diameter and, excluding the B7 base pins, is  mm tall.

References: Data-sheet& Data. Type K80A was first introduced in 1935. See also 1935 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum