• New
Radio Corporation of America



Best quality beam power amplifier tubes manufactured in the United States by RCA. These 12 pin Duodecar based glass tubes, designed for television receiver service, come with long gray plates, side and top getters, and are glass etched 35LR6 U.S.A. Thay are also printed in red with new style RCA logo and various production codes. Boxes are standard new style RCA red printed 35LR6.


Tube Matching
Tube Matching
$6.00 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.


35LR6 GRAY PLATE (nos)
4 Items

Data sheet

12 pin Compactron Duodecar
Boite type
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