CV138 / EF91 / 5A/160H
  • CV138 / EF91 / 5A/160H
  • CV138 / EF91 / 5A/160H
Various manufacturer

CV138 / EF91 / 5A/160H

8.00 USD

 Excellent quality RF amplifier tubes manufactured in England for the British military. These 7 pin miniature glass tubes, equivalent to 6F12, 8D3, Z77, have smoked glass, double mica supports and top getters. They are printed in white with military arrow GH, HG, HK, HL, HM, CV138 KB/EN indicating Thorn AEI Sunderland or Brimsdown, STC Footscray, or MOV Gateshead factories. Production dates are 1950's.  

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

Various manufacturer
111 Items

Data sheet

Base
7 pin miniature B7G
Boite type
4/1
Emplacement
49
Quide
2109
Fonction
Pentode
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