• New


49.00 USD

Finest powerful amplifier tetrode tubes manufactured in England by renowned Sylvania. These thick glass B9G 9-pin Loctal based tubes come with black plates, heavy internal structure, and top double getters. They are printed in yellow with Sylvania logo SYLVANIA, and in white KT67 MADE IN U.K. with 3 digit production code. Boxes are standard Sylvania yellow and black printed KT67.

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.


13 Items

Data sheet

9 pin Loctal B9G
Boite type
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