VLS631 / CV342
  • VLS631 / CV342
  • VLS631 / CV342
International Telephone & Telegraph

VLS631 / CV342

9.00 USD

Top quality miniature glass thermal delay tubes manufactured for the British military in England by renowned International Telephone and Telegraph (ITT). The heater takes a defined time to heat a bi-metallic strip and make contact; used to delay application of HT voltages until tube heaters are at correct temperatures. Tubes are marked in blue ITT VLS631 MADE IN ENGLAND and date stamped 7036 indicating 1970 production. Boxes are white military marked STC VLS631 VALVE ELECTRONIC MADE 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

70 Items

Data sheet

Base
7 pin miniature B7G
Boite type
1/1
Emplacement
50
Quide
630
Fonction
Thermal delay switch
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