Incredibly rare and considered to be one of the best 5U4G rectifier tubes made. This Winged "C" 5U4G / 5U3C tube has black-plate construction and was made from the late 1950's to early 1960's. This tube is labeled with it's Russian name 5U3C but is an exact replacement for any 5U4-G tube. Availability: Usually ships within 24 hours. 
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