Various manufacturer

12GN7 / 12HG7 FAT BOTTLE

13.00 USD

Fine fat bottle pentode amplifier tubes manufactured by various makers in North America. These 9 pin B9A based glass tubes, designed for television receiver service, come with gray plates and top getters. They are printed with various maker's markings, and glass etched 12HG7 U.S.A. Boxes are standard manufacturer's printed 12HG7. Photo is typical of available stock.

Condition

New Bulk
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.