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12FX8A
  • 12FX8A
  • 12FX8A
Raytheon

12FX8A

9.00 USD
6.00 USD Save 3.00 USD

Top quality miniature glass triode-heptode tubes manufactured in United States by renowned Raytheon. Thes amazing 9-pin tubes are designed for automobile radio receiver service, and run with plate and screen voltages supplied by a 12 volt storage battery. The triode section is an RF amplifer, and the heptode section a frequency converter. Tubes with black plates, and top halo getters, are printed in yellow RAYTHEON REGISTERED 12FX8A U.S.A. and coded QO2; also glass etched 12FX8 U.S.A.. Boxed in standard red and white Raytheon boxes identified 12FX8A.

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

Raytheon
145 Items

Data sheet

Base
9 pin miniature Noval B9A
Boite type
1/3
Emplacement
43
Quide
1168
Fonction
Triode heptode
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