8425A / 6AU6A
  • 8425A / 6AU6A
  • 8425A / 6AU6A
General Electric (GE)

8425A / 6AU6A

12.00 USD

Special purpose miniature glass pentode tubes manufactured in the United States by renowned General Electric. With gray plates and top getters, these fine 7-pin sharp cut-off pentode tubes are operationally similar to 6AU6 tubes, but specially designed as wide band RF and IF amplifiers, with high mutual conductance to plate current ratio. They undergo special tests to ensure long life in industrial applications. They are white printed with GE logo, MADE IN U.S.A. 8425A/6AU6A, 4-digit date code, and Owensboro Kentucky plant code 188. Thay are also glass-etched 6AU6A U.S.A. and dot code.


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.

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2 Items

Data sheet

7 pin miniature B7G
Boite type
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