12AT7 / ECC81
  • 12AT7 / ECC81
  • 12AT7 / ECC81
General Electric (GE)

12AT7 / ECC81

23.00 USD

Quality double triode tubes manufactured in the United States by renowned General Electric. These fine 9 pin miniature glass tubes, suitable for audio or RF amplification, oscillator or mixer service, come with short gray plates and top halo getters. They are printed in white with GE logo, ELECTRONIC TUBE 12AT7 / ECC81, and coded SK 188-5, indicating Owensboro Kentucky manufacture. They are also glass etched 12AT7 U.S.A. with dot code. Boxes are standard GE gray and orange printed 12AT7 / ECC81.

Condition

Tube Matching
Tube Matching
6.00 USD by tube

WHY ?

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.

HOW ?

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.
Quantity

General Electric (GE)
15 Items

Data sheet

Base
9 pin miniature Noval B9A
Fonction
Double triode
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