• New
Motorola

7551 GRAY PLATE

11.00 USD

Top of the line beam pentode amplifier tubes manufactured in the United States by Motorola. These 9 pin based miniature glass tubes, designed for AF or RF amplifier service in mobile equipment, come with gray plates and top round getters. Thay are glass etched 7551 U.S.A., printed in red MOTOROLA MADE IN U.S.A., and coded 312 ACH 044. Boxes are standard Motorola black and white printed PART NO. 7551.

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

20 Items

Data sheet

Base
9 pin miniature Noval B9A
Boite type
1/3
Emplacement
47
Fonction
Pentode
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