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This example of the AC/P has the classic envelope and is of later production than AC/P with the balloon envelope. It was probably made much later than 1930 and produced for replacement purposes, rather than for new radios.

Although the envelope is partially opaque the internal structure can be seen. The cathode is flat, and the whole electrode structure is smaller than the original.

The carton describes the AC/P for use as an LF amplifier or output valve. The cathode is indirectly heated making it suitable for operation on alternating current supply.

As an output valve the power available was up to 640 mW.

The classic envelope is 42 mm in diameter and, excluding the B5 base pins, is 93 mm tall.

References: Data-sheet, ¹⁰⁴⁰ & ¹⁰⁴³. Type AC/P was first introduced in 1929. See also 1929 adverts.

Pin Connections

Absolute Maximum Operating Conditions^¶

PDF scanned from an original document held by the museum