Sovtek

5C4M / 5Z4

12.00 USD

Tough mil. spec full wave rectifier tubes manufactured in Russia by Sovtek in the 1970’s. These 8 pin glass octal based tubes come with huge steel plates, two thick mica spacers, and top getters. They can easily handle up to 400 plate volts at currents up to 250 mA. They are marked 5U4M OTK with various other codes. Photo is typical of available stock.

Condition

New Bulk

	Tube Matching 6.00 USD by tube
LEARN MORE WHY ? A tube may have one, two, or three internal sections depending on the purpose of the tube; somtimes these sections are all the same, sometimes they are different. Due to manufacturing and material tolerances, there may be slight differences between the original specification and the actual tube. Tube matching tests each one of these internal sections and selects tubes, compared to original specifications at manufacture, for balanced performance and good sound. HOW ? All our tubes are tested by us prior to packing on our Stark, AVO, Simpson or RF Laboratories Inc. calibrated testers. On request for tube matching, tubes are matched for Mutual Conductance in Micromhos and Plate Current in Milliamps on our Amplitrex or Radioelec Duovac testers, with results printed for each individual tube. Certain tubes difficult to test are matched for Mutual Conductance in Micromhos only on one of our regular calibrated testers. On request we can also test for Microphonics.