6D2 / 6AL5 DOUBLE TESTED
  • 6D2 / 6AL5 DOUBLE TESTED
  • 6D2 / 6AL5 DOUBLE TESTED
Ediswan

6D2 / 6AL5 DOUBLE TESTED

8.00 USD

Rare mint boxed NOS double-diode miniature glass tubes manufactured in England by Ediswan; 1953 P CX coded production. These tubes have been in Geneva warehouse for 60 years until we found them, and have been individually tested post production for mutual conductance and plate current, with test slips inside; each tube is marked with painted pink tip. Tubes are stamped EDISWAN VALVE 6D2 P CX CODE MADE IN ENGLAND B.V.A. Corrugated cardboard rolls protect tubes inside standard blue and red Ediswan boxes marked FOR EXPORT ONLY. Also BVA logo and SIEMENS EDISON SWAN, 155 CHARING CROSS RD, LONDON W.C.2. ENGLAND AN A.E.I. COMPANY.

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

Ediswan
91 Items

Data sheet

Base
7 pin miniature B7G
Boite type
2/1
Emplacement
48
Quide
1748
Fonction
Double diode