53KU Cossor GZ37 Square getter British made yellow print CV378 GZ33 U54 pair tested 100%
Cossor 53KU GZ37 yellow print rare £ 250 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 GZ37 on glass with yellow print, square getter and code on glass IS1 B9J and IS1 BOD both made at Blackburn works.
Brown base.
A well engineered valve that lasts longer than any other counterpart, delivering excellent rectification.
Tested with AVO VCM 163 with A1=A2 100% emission
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