DW4/350 Mullard original boxes UU120/350 442BU oxide coated ribbon filament

Mullard DW4/350 boxed £ 200 pair.

Mullard DW5/350 boxed £ 350 quartet.

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Description

DW4/350 Mullard UU120/350 442BU oxide coated ribbon filament.

First introduced in 1936 and used in radio and PX4 PX25 amplifiers

Full wave directly heated rectifiers that came after the Mullard DW3 and quite similar.

Full getter with ribbed black plates.

All four valves are mint with original boxes and tested 100% emission

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