NOS NIB Matched Pair 6f8G / 6sn7 JAN Sylvania Made in Usa

Descripción

Description:

Internal features: shiny black plates

Test on Triplett 3444…Result

The double triode tester

Detects hums and mechanical noises through a sound test

Double triodes are tested in the tube tester of our own development and manufacture.

This equipment checks the valves in real working conditions, detects hums and mechanical noises through a sound test. In fact, unlike commercial testers, which perform a compromise test, this tester tests the tube as if it were operating in audio equipment (tube testers never test tubes at that level).

Therefore, you will receive: double triodes without instability or progressive increase in current due to gases, emitting grid or contamination in the separator micas, mechanical noises, random noises due to ionization of residual gases or difference in gain between both triodes.