12SH7 / VT-288 JAN CRC
  • 12SH7 / VT-288 JAN CRC
  • 12SH7 / VT-288 JAN CRC
Radio Corporation of America

12SH7 / VT-288 JAN CRC

6.00 USD

Top of the line octal based pentode tubes manufactured for US military by world renowned RCA. These metal tubes are printed in white JAN 12SH7 VT-288 MADE IN U.S.A. with old style RCA logo, and coded K6E or H5E. Brown military boxes are printed U.S. ARMY U.S. NAVY MFGD. BY RADIO CORPORATION OF AMERICA, different contract numbers and 1940's dates. Some boxes are also printed LINK RADIO CORP. N.Y.C. or ADMIRAL CORP. CONT. 62370, and stamped in German GEPRUFT.

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

132 Items

Data sheet

Base
8 pin Octal
Boite type
3/1
Emplacement
19+7
Quide
2892
Fonction
Pentode
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