This round, I’m testing tubes which claimed to be “matched pair” by the seller. I’m using uTracer 6 for this purpose.

In general, it’s not easy to find what so called “matched pair” tubes as we need a lot of tubes to be matched and most likely those tubes were not made 100% the same from the factory. So finding two which are matched are actually kind a rare situation and must have one (if you could afford) 🙂