MULLARD BLACKBURN 7189 1-Hole Plate Power Tube TESTS NOS on AT1000 6BQ5 EL84

TESTS NOS on Amplitrex AT1000. Amplitrex AT1000 Test Results 95%+ GM = Within NOS Specs 90%+ EM = Within NOS Specs.

All tubes are tested with the Audiophile in mind for SHORTS, GAS, MUTUAL CONDUCTANCE, EMISSION and NOISE (large tube lots are not tested for noise).