Q&A regarding different micromhos scores
Hey Tubesound,
Hoping you can answer a question for me. I have an Amplitrex and a TV-7D/U tube tester. The Amplitrex tests a 12ax7 as new at 1600GM. According to your TV7 GM calculator, I believe that should translate to 64 on the TV meter. However, when I test the same 12ax7 on my TV-7 the meter only hits 42. Does it sound like my TV7 needs some calibrating or am I missing something? Hope you can help and thanks for the great calculator.