Philips

E90F SQ / 7693 / 6BH6

15.00 USD

Top quality Special Quality RF pentode tubes manufactured in Holland by renowned Philips Minwatt. These miniature glass 7 pin tubes are shock and vibration resistant, and are designed for industrial and mobile equipment. They come with mesh plates, and top halo getters. They are printed in white PHILIPS MINIWATT 7693 E90F SQ SPECIAL QUALITY, and engraved HOLLAND. Boxes are standard Miniwatt yellow and red printed 7693 E90F.

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
36 Items

Data sheet

Base
7 pin miniature B7G
Boite type
4/1
Emplacement
37
Quide
693
Fonction
Pentode
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