Matched Pair of Mullard 6SJ7 Tubes NOS NIB Amplitrex Tested
Matched Pair of Mullard 6SJ7 Tubes - NOS NIB - Amplitrex Tested. See Pictures for Test Scores. For best results - before you install your tubes be sure that your power is off, that the tube sockets are tight and cleaned periodically with a product like Detoxit 100%. All tubes are tested and matched on the Amplitrex AT1000 digital tester, in Fixed Bias mode.