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AC/DC mains rectifier

1935-1960

Rectifier, comprising metal box with carrying handle and wedge-shaped base

1950-1960

Two uniplate rectifiers

Mercury vapour thyratron rectifier, resemble large light bulb with 4-pin socket at base, English, 1935-1960

Mercury vapour thyratron rectifier

1835-1960

5 thyratron valve rectifiers, resemble large light bulbs with screw socket and insulated lead, made by B.T.H. Co. Ltd., Rugby, English, 1935-1969

5 thyratron valve rectifiers

1935-1960

3 mercury vapour thyratron rectifiers, resemble large light bulbs with 4-pin plug at base, made by B.T.H., Rugby, English, 1935-1960

3 mercury vapour thyratron rectifiers

1935-1960