ECH83 DIAMOND BASE
  • ECH83 DIAMOND BASE
  • ECH83 DIAMOND BASE
Telefunken vacuum tubes

ECH83 DIAMOND BASE

18.00 USD

 Top of the line triode heptode tubes manufactured by Telefunken in Germany. These fine miniature glass 9 pin tubes, designed as mixers in car radio sets, have filaments which may be operated at 6v. or 12v. and they come with silver plates and top halo getters. They are printed in white with Telefunken logo, MADE IN GERMANY ECH83 and Berlin factory coded 1970 or 1971 production. They are boxed in standard Telefunken blue and orange boxes.

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

Telefunken vacuum tubes
25 Items

Data sheet

Base
9 pin miniature Noval B9A
Fonction
Triode heptode
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