Tube Amp Doctor Matched Pair JAN GE USA NOS - Amplitrex AT-1000 Verified
Very desirable.
This listing is for (2) brand new (NOS), JAN 12AT7 as a matched pair. Matched by Tube Amp Doctor. Matching verified on an Amplitrex. The Amplitrex is a computer controlled tester of laboratory accuracy. It is becoming an industry standard. Manufactured in the USA. Tubes matched to gm within 10% or better). We also check noise and Micro-phonics. You can see how closely matched they are from the box labels. Highly desirable and rare. These tubes are generally used as drivers in power amplifiers and final outputs in pre-amplifiers because of their drive capability.
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