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The Ever Ready K30K is a directly heated triode and identical to the Mullard PM2HL.

The bulb is clear on the reverse and the triode structure is revealed.

The filament tension is maintained by coiled springs above the top mica.

The electrode assembly from the side. The four oxide coated filament strands can be seen passing through the grid and anode.

The balloon envelope is 41 mm in diameter and, excluding the B4 base pins, is 83 mm tall.

References: Data-sheet & ¹⁰⁴³. Type K30K was first introduced in 1937. See also 1937 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Andy Cowley for supplying the above PDF datasheet.