• New


27.00 USD

Top quality pentode tubes, latest version of 50C5, manufactured in the United States by renowned Sylvania. These 7 pin miniature glass beam power amplifier tubes require low plate and screen voltages, and are therefore particularly suitable for AC/DC radio receiver service. They come with long gray plates and top getters, and are glass etched 50C5 U.S.A. with dot codes. They are printed in yellow 50C5A SYLVANIA, and boxed in standard Sylvania yellow and black boxes printed 50C5A.


Tube Matching
Tube Matching
6.00 USD by tube


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.


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.


42 Items

Data sheet

7 pin miniature B7G
Boite type
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