arthursmuck:
Most of the nos tubes will have a thicker, denser, sound due to a less extended high end. My RCA's sound nice. Another approach is to reduce grain and glare by upgrading the amp's fuse to a Synergistic Research Black fuse and the wall outlet to a Oyaide R-1 or a SR RED or BLACK. TheOyaide has a darker sound. The SR outlets provide a sense of more music and richer denser harmonics.
David Pritchard