Various manufacturer

3Q4 JAN

9.00 USD

Top quality Mil. Spec. pentode power output tubes manufactured in the United States by various manufacturers. These fine miniature glass 7 pin tubes were designed for the Armed Forces for minimal filament power consumption in mobile equipment. They come with silver plates, top getters, and are glass etched 3Q4 U.S.A. with various makers markings. Boxes are standard military beige NATO coded 5960-188-3540, and printed 3Q4 JAN. Photo is typical of available inventory.

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

15 Items

Data sheet

Base
7 pin miniature B7G
Boite type
1/1
Emplacement
33
Fonction
Pentode
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