No problem John; it's not a matter of relaxation but simple facts. You'll find that most knowledgable listeners prefer the 45, PX-25, and 50 to the 300B given the speaker can be driven by all four triodes. 300B is weak at the bottom and rolled off at the top. The "magic" and mystique is in the mid-range which is in fact quite relaxed and supple. At the extremes, 300B is much too compromised and does not compare to the others.
Perhaps with a bit more experience you will understand.
Perhaps with a bit more experience you will understand.