(!!) 53KU=GZ37=CV378 Cossor Valve UK brown base used/tests very good 1948-1953 small mica flake inside tube, small rattle inside base (50/40 and 51/40)

$ 198.88

1 tube) 53KU=GZ37 Cossor UK used/tests very good brown base 1948-1953 balanced diode sections in white box



small rattle inside base; dried glue particles from age - does not effect tube performance

small white mica flake inside tube; rests at bottom of tube - does not effect tube performance

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