TubeNet

I've got a recording (on LP and CD) of the Prokofiev 5 with the St. Louis Symphony under Leonard Slatkin, 1984. I really like the round, full, blended sound of the tuba on this one. Who was the player?

I'm pretty confident that's Gene Pokorny on an HB 2, he's also on the Chicgo/Levine DG recording several years later.