Curve tracing vs single point test. Tube factories matches tubes based on a single-point measurement. But we performs one to two hundreds mesurements in order to plot the curves. Therefore, our test can reveal  tube characteristic that is hidden in other tests. Hidden problems can also be revealed.

Why is matching important for tubes? Each tube is different from one another due to the handmade processing. You may be surprised how two tubes perform differently even though they are labelled as “matched” with the single-point test. But power tubes are so critical that matching them carefully can make the music more alive!