Sylvania

408A GOLD PIN

15.00 USD

Finest quality gold pin audio pentodes manufactured in the United States by Sylvania. These beautiful miniature glass 7 pin amplifier tubes come with black plates and top halo getters. Designed for high frequency audio amplification, these tubes are glass etched GB 408A and printed in gold (some printing may be obscured) with Sylvania logo, GB-408A SYLVANIA GOLD BRAND MADE IN U.S.A. with various production codes.

Condition

New Bulk

	Tube Matching 6.00 USD by tube
LEARN MORE 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.