International

7543 GRAY PLATE

14.00 USD

Special quality 6AU6 tubes manufactured in Germany or elsewhere by renowned International. These 7 pin miniature glass pentode amplifier tubes, for use where minimising microphony and hum are critical, come with gray plates and top disc getters. They are printed in white INTERNATIONAL SERVICEMASTER 7543 W. GERMANY, and are in standard International blue boxes printed 7543.

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

18 Items

Data sheet

Base
7 pin miniature B7G
Boite type
1/3
Emplacement
47
Quide
5
Fonction
Pentode
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