Siemens

E83F / 6689 GOLD PIN

28.00 USD

Magnificent gold pin Special Quality miniture glass pentode amplifier tubes manufactured in Germany by Siemens. These amazing 9 pin tubes, manufactured for reliable 10,000 hour telephone service, come with silver mesh plates, rugged internal structure, top halo getters, and can take up to 550 volts on the anode. They are printed in white with Siemens logo, SIEMENS E83F 6689 MADE IN GERMANY. Boxes are standard Siemens yellow and blue printed E83F 6689.

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

Siemens
25 Items

Data sheet

Base
9 pin miniature Noval B9A
Boite type
1/2
Emplacement
49
Quide
92
Fonction
Pentode
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