RCA vacuum tubes

6AB4 / EC92 BLACK PLATE

8.00 USD

Quality miniature glass amplifier tubes manufactured in the United States by RCA. These wonderful 7 pin triode tubes, designed as HF oscillators or RF amplifiers, come with black plates and top getters. They are glass etched 6AB4 U.S.A. and printed in white RCA ELECTRON TUBE with old style RCA logo, and various codes. Boxes are standard RCA red and black printed 6AB4. Photo is typical of available inventory.

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.