Philips

6688 / E180F JAN GOLD PIN

21.00 USD

Top quality gold pin wide band amplifier tubes manufactured for the Armed Forces in Holland by Philips. These beautiful 9 pin miniature glass tubes with 3 mica spacers, designed for operation under conditions of extreme shock and vibration, come with short gray plates and top getters. They are printed in white PHILIPS MADE IN HOLLAND JAN-6688, coded 74 HPA 30 indicating 1974 production. Boxes are standard military white printed JAN 6688, and NATO coded 5960-5674 under contract 3GE.T8080-0GE3-1321.

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

Philips
59 Items

Data sheet

Base
9 pin miniature Noval B9A
Boite type
1/2
Emplacement
47
Fonction
Pentode
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