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The Triotron SP2 battery audio output valve is described as a Magna Power Type. In the late 1920's and early 1930's a few hundred milliwatts was huge.

The Type is the same as the Mullard battery pentode - just to confuse. We have altered the Triotron Type from SP2 to SP.2.

The horizontal electrode assembly.

The identification is only on the dome.

The balloon envelope is 45 mm in diameter, and excluding the B4 base pins is 86 mm tall.

Reference: Data-sheet Data & ¹⁰⁴³. Type SP.2 was first introduced in 1930. See also 1930 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum