2C51 / 396A
  • 2C51 / 396A
  • 2C51 / 396A
National

2C51 / 396A

18.00 USD

 Fine 9 pin miniature glass tubes manufactured in the United States by renowned National. These double triode amplifier tubes, designed for industrial and aircraft equipment where long service life and uniform operating characteristics are on prime importance, come with gray plates, thick mica supports, and top halo getters. They are printed in red with National logo, NATIONAL 2C51 / 396A MADE IN U.S.A. Boxes are standard National red and white printed 2C51 / 396A.

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

National
12 Items

Data sheet

Base
9 pin miniature Noval B9A
Fonction
Double triode
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