53KU Early Cossor black ribbed plate, full round getter GZ37 CV378 pair rectifiers tested 100%
Cossor 53KU black plate early type £ 450 pair
Description
The GZ37 aka 53KU is an indirectly heated full wave rectifier and together with the U52 the 53KU and GZ37 are the most sought after valves here at AM.
Looking at the Cossor 53KU there are two separate valve in one envelope
Cossor started production of the 53KU circa 1958
Pair of Cossor 53KU for sale here feature black ribbed plate with large getter located in the middle of envelope.
Black base.
A well engineered valve that lasts longer than any other counterpart, delivering excellent rectification.
Clean top and in great shape.
Both come with Cossor boxes
Tested with AVO VCM 163 with A1=A2 100% emission
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