Mullard vacuum tubes

CV483 / M8157

9.00 USD

Best quality beam tetrode amplifier tubes manufactured for the Armed Forces in England by renowned Mullard, starting in 1947. These robust thick glass 9 pin loctal based B9G tubes, designed for low VHF driver and frequency multiplier service, come with oval gray plates and double top getters. They are printed in white with Mullard logo, MULLARD M8157 MADE IN GREAT BRITAIN CV483, and engraved on metal base 5E2 B4K4.

Condition

New Bulk

	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.