85 / 285 / CV2549
  • 85 / 285 / CV2549
  • 85 / 285 / CV2549
International

85 / 285 / CV2549

9.00 USD

Excellent quality double diode triode tubes from the United States by renowned International. These fine audio tubes, of shoulder type glass construction, similar to 285, PH285 and British Military CV2549, come with 6 pin bases. They are printed in white INTERNATIONAL SERVICEMASTER 85 U.S.A. coded 922-87, and are 1980's production, glass etched 85 FIVRE, possibly manufactured by them in France. Boxes are standard International blue printed 85.

Condition

Tube Matching
Tube Matching
6.00 USD by tube

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.
Quantity

International
14 Items

Data sheet

Base
6 pin UX6
Boite type
1/1
Emplacement
23
Quide
704
Fonction
Double diode triode