Sylvania

12AT7WA/C BLACK PLATE JAN

26.00 USD

Fine mil. spec. preamp double triodes manufactured in the United States by renowned Sylvania. These miniature glass 9 pin tubes have small ribbed black plates, thick mica spacers, four stout copper posts and top halo getters. They are printed in green JAN 12AT7WA/C SYLVANIA U.S.A. and coded typically 34167 ADS with late 1970's early 1980's date codes.

Condition

New Bulk
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.