Chatham valves


12.00 USD

Top quality Mil. Spec. power rectifier tubes manufactured in the United States by renowned Chatham. These versatile 8 pin octal based glass tubes come with brown military bases, and may be used as voltage doublers, half-wave or full-wave rectifiers. They are printed on base JAN-CAHG-25Z6WGT MADE IN U.S.A. CHATHAM ELECTRONICS. Boxes are standard military beige, NATO coded 5960-00-188-0841, and printed 25Z6WGT.


Tube Matching
Tube Matching
6.00 USD by tube


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.


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.


7 Items

Data sheet

8 pin Octal
Boite type
Full-wave rectifier
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