Bendix Aviation vacuum tubes

12SG7 / VT-209 JAN

8.00 USD

Rugged Mil. Spec. pentode tubes manufactured by RCA in the United States for Bendix Radio Corporation. These excellent quality black metal 8 pin octal based amplifier tubes, designed for high mutual conductance applications, come printed with old style RCA logo, 12SG7 VT-209 U.S.A. coded SC 300-A. From 1942 production, they are boxed in standard military beige boxes printed U.S. ARMY SIGNAL CORPS TUBE VT-209 (2T209) ORDER NO. 151-WFSCPD-42 SC 278A BENDIX RADIO CORPORATION.

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

Bendix Aviation vacuum tubes
60 Items

Data sheet

Base
8 pin Octal
Boite type
4/7
Emplacement
19
Fonction
Pentode