Mullard master valve in its original box.

Mullard PM22A 5-pin master valve in its original box (130 x 50 x 50 mm) used to power a radio from a 120V battery, probably in use from the mid-1920s until the 1950s.

Object Details

Other Number: not specified
Normal Location: Pedestal Unit 1: drawer 4
Current Location: normal location

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