FW4/500 Mullard GEC brown base black plate U18/20 full wave rectifiers
Mullard FW4/500 audio rectifiers £ 400 pair
Mullard FW4/500 audio rectifiers £ 750 quartet.
Description
Mullard FW4/500 audio rectifiers, full wave rectifiers with black plate and square getter.
They look the same as a U52 bu these have 4-pin base.
Equivalent of U18/20.
Z code on glass made at Hammersmith, London in the 1955.
All four valves have been tested and in full working order 100% emission.
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