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  • -11.00 USD
CV428 / 5B/254M
  • CV428 / 5B/254M
  • CV428 / 5B/254M
Standard Telephone and Cable

CV428 / 5B/254M

26.00 USD
15.00 USD Save 11.00 USD

Amazing glass beam tetrode tubes manufactured in England for the British military by renowned STC. These tubes, electrically equivalent to the legendary 807 tetrodes, are built with extra thick glass, black vertical plates complemented by cooling fins, double top D-getters, and top cap plate connection, with 8-pin loctal bases. Tubes are identified on one side in white with STC logo, MADE IN ENGLAND 5B/254M, and on reverse side CV428 KG War Office arrow, and KB/F (indicating production at STC Paignton factory in England).

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

Standard Telephone and Cable
100 Items

Data sheet

Base
8 pin Loctal
Boite type
1/1
Emplacement
28
Quide
3103
Fonction
Tetrode
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