6688 JAN
  • 6688 JAN
  • 6688 JAN
General Electric

6688 JAN

18.00 USD

Best quality Mil. Spec. high mutual conductance pentodes manufactured for the Armed Forces in the United States by General Electric. These 9 pin miniature glass tubes, designed for dependable operation under conditions of severe shock and vibration, have short gray plates and top halo getters. They are glass etched 6688 U.S.A. with dot code and printed in green with GE logo, JAN 6688 MADE IN U.S.A. with variable 1960's and 1970's production codes. Boxes are standard military brown or beige printed JG or JAN 6688, some with NATO code 5960-820-8717.

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

General Electric
17 Items

Data sheet

Base
9 pin miniature Noval B9A
Boite type
1/2
Emplacement
47
Quide
546
Fonction
Pentode