• New


12.00 USD

Fine diode-pentode diode power amplifier tubes manufactured in the United States by renowned Ken-Rad. These pristine gless 8 pin octal based tubes, designed for low current drain battery operated equipment, come with silver plates and bottom getters. They are glass etched 1N6G, printed in whitre on base KEN-RAD MADE IN U.S.A. and coded C1R. Boxes are standard old style Ken-Rad red and black printed 1N6G.


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.


9 Items

Data sheet

8 pin Octal
Boite type
Diode pentode
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