ECC801S / 12AT7

49.00 USD

Best quality double triode 9 pin audio amplifier tubes, garanteed 10,00 hours (mil. spec.). These fine miniature glass amplifier tubes have gray plates, thick mica spacers, and top round getters. They do not have diamond bottom, but we believe the manufacture may have been subcontracted to General Electric or others in USA in the 1970' or 1980's. They are printed in white with Telefunken logo ECC801S with various 5 digit codes. Boxes are standard Telefunken blue, white and orange printed ECC801S.

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.