CV21 / VP41
  • CV21 / VP41
  • CV21 / VP41
Various manufacturer

CV21 / VP41

18.00 USD

Extremely rare octal-based metalised glass tubes designed for the HF stages of television receivers. Originally designed and manufactured by Mazda Ediswan in England in 1938, these high frequency glass pentode tubes were manufactured until 1948. With a variable-mu characteristic, and large signal handling capacity, these tubes are printed War Office arrow CV21, they have gray metalised glass finish, are wrapped in a corrugated cardboard and tissue paper roll, and boxed in brown miltary boxes printed CV21 10E/21.

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
56 Items

Data sheet

Base
8 pin Octal
Boite type
1/1
Emplacement
28
Quide
1624
Fonction
Pentode
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