RCA vacuum tubes

3B25 SILVER PLATE

29.00 USD

Amazing xenon filled half-wave rectifier tubes manufactured in the United States by RCA. These 4 pin UX4 base thick glass tubes, capable of up to 400 volts on the anode, come with solid interior construction, silver plates and side getters. They are printed in white with old style RCA logo, RCA ELECTRON TUBE RADIOTRON MADE IN U.S.A. They are also glass etched 3B25. Boxes are standard RCA red and black printed 3B25. Photo is typical of available stock.

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

RCA vacuum tubes
3 Items

Data sheet

Base
4 pin UX4
Boite type
3/1
Emplacement
04
Quide
58
Fonction
Half-wave rectifier