12BW4 BLACK PLATE
  • 12BW4 BLACK PLATE
  • 12BW4 BLACK PLATE
Sylvania

12BW4 BLACK PLATE

7.00 USD

Quality miniature glass full-wave rectifier tubes manufactured in the United States by renowned Sylvania. These 9 pin high current tubes can output a steady 350 mA, and come with black plates and top round getters. They are printed in yellow SYLVANIA MADE IN U.S.A. and coded CR AER. They are also glass etched 12BW4 U.S.A. Boxes are standard Sylvania yellow and black printed 12BW4.

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

Sylvania
15 Items

Data sheet

Base
9 pin miniature Noval B9A
Boite type
1/1
Emplacement
42
Fonction
Full-wave rectifier
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