Various

1620

17.00 USD

Special quality metal pentode amplifier tubes manufactured in North America by various manufacturers. These fine 8 pin octal based tubes, functional equiavalent to 6J7, are designed especially for applications where microphonics are critical. They come with various makers markings, including 1620 on tube, and 6J7 U.S.A. stamped on base. Boxes are standard manufacturers marked 1620 with makers name.

Condition

New Old Stock (New in box)
Used Tested

	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.