Sylvania

5814A / 12AU7 GOLD BRAND

24.00 USD

Rare top quality double triode preamp tubes manufactured in the United States by Sylvania. These fine 9 pin miniature glass amplifier tubes come with gray plates, thick copper posts, and top getters. They are printed in gold GB 5814A SYLVANIA MADE IN U.S.A. GOLD BRAND with several digit production codes. They are also glass etched GB 5814A U.S.A. Boxes are Sylvania gold, black and white, printed GB 5814A.

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
Last items in stock

Sylvania
1 Item

Data sheet

Base
9 pin miniature Noval B9A
Boite type
3/12
Emplacement
SS
Quide
437
Fonction
Double triode
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