5U4C (aka 5Z4) Russian Rectifier tube. NOS

NOS Russian tube rectifier 5U4C. Equivalents 5Z4GT. This vintage Russian 5U4C (5Ц4С in Cyrillic script) rectifier is a 5Z4 equivalent. This slow rise, indirectly heated rectifier should be considered an upgrade for a 5Y3 tube in most circuits, and will drop slightly less voltage. It has gray plates and a bottom dish getter. The silver print on the base has the OTK inspection stamp. Made XI-75.