Sylvania

7A4 JAN

10.00 USD

Top of the line Mil. Spec. triode amplifier tubes manufactured for the United States Armed Forces by Sylvania. These JAN type glass tubes are designed for use in high mutual conductance UHF circuits. They come with 8 pin loctal bases and chrome tops. They are printed in yellow JAN-CHS-7A4 VT-192 MADE IN U.S.A. SYLVANIA, and glass etched 7A4. Boxes are standard blue Westinghouse printed 7A4.

Condition

New Old Stock (New in box)

	Tube Matching 6.00 USD by tube
LEARN MORE 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.