Try asking Conrad Johnson (Knut), they will give you an honest answer. As far as the best tube goes I have always found the stock tubes ultimately provided the best all around results / performance. Other tubes I have tried, and I have not experimented with alot of tubes, have always done a more of this a little more of that but ultimately I ended up back with using the tubes the equipment was designed for.
Just my thoughts.
Chuck
Just my thoughts.
Chuck