General Electric

12BV7 / 12BY7A

19.00 USD

Fine pentode miniature amplifier tubes manufactured in various countries by renowned General Electric. These excellent 9 pin glass tubes, designed fro television receiver service, mostly from USA/Canada/Japan, come with gray or black plates and vriable position getters. They are printed in white with GE logo, ELECTRONIC TUBE, with various production codes. Boxes are old style or new style GE orange and white printed 12BY7A 12BV7 and sometimes 12DQ7. Photo is typical of available inventory.

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
26 Items

Data sheet

Base
9 pin miniature Noval B9A
Boite type
2/1
Emplacement
SS
Quide
285
Fonction
Pentode