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The 230XP is described by Cossor as a Super-Power valve. It is for audio output and the data-sheet suggests that two may be used in push-pull.

The anode load is 3,500 Ω and the output for a single valve is 450 mW.

The electrodes have a rectangular mica support at the top but this is not wedged into the balloon envelope.

A closer view of the grid and oxide coated filament.

The Cossor name and Type designation. This style was in use for at least a decade.

Thanks to Mark from Vintage-parts for sending these images.

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

References: Data-sheet, & ¹⁰⁴³. Type 230XP was first introduced in 1929. See also 1929 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

Thanks to Frank Philipse for supplying the above PDF datasheet.