Amperex vacuum tubes

7788 / E810F GOLD PIN

75.00 USD

Top of the line pentode amplifier tubes manufactured by Amperex in the United States or Holland. These 9 gold pin based tubes are shock and vibration resistant, and are designed for wide band amplifier applications. They come with gray plates and top halo getters, and are printed in orange or white P. Q. (premier quality) AMPEREX 7788 MADE IN U.S.A./HOLLAND. Boxes are standard Amperex green and yellow printed 7788. Photo is typical of available inventory.

Condition

New Bulk
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.