Ediswan

EZ90 / 6X4

22.00 USD

Rare miniature glass 7 pin rectifier tubes manufactured in England by Ediswan. These tubes are designed for use as full-wave rectifiers in audio, small transmitters, and auto applications. These tubes with black plates and top halo getters, are printed in white EDISWAN VALVE EZ90. Boxes are light green and dark blue printed EDISWAN EZ90 EDISWAN EXPORT DIVISION THORN RADIO VALVES.

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.