7289 / 2C39A
  • 7289 / 2C39A
  • 7289 / 2C39A
Radiotechnique

7289 / 2C39A

36.00 USD

Top of the line metal and ceramic high-mu triodes manufactured by Radiotechnique in France. These fine tubes are designed as grounded grid oscillators, amplifiers, or frequency multipliers up to 2 500 Mc/s. Printed in black RTC AIR 7289 RT 85 05, indicating 1985 production, they come in sealed plastic packs in foam and boxed in brown military boxes printed AIR MARCHÉ STTEA 84/80.176 RTC and NATO coded 5960-14-340 4956 AF.

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

30 Items

Data sheet

Base
N/A
Boite type
1/2
Emplacement
03+1
Quide
1170
Fonction
Triode
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