’less costly’ tubes sounded better
My used Cayin amp had a pair of 6sn7 and pair of 6sl7, Cayin branded, no maker’s id, absolutely identical looking, but numbers were marked
Tested em all, incl power tubes. With my great experience I put two in wrong sockets and blew a 6sl7.
Put a used GE from stock, sounded great.
Ordered matched pair Sylvania Military grade, cool looking chrome tops (wanted visibly different, so smart) They did NOT sound good.
Brent Jesse had me first break them in 60 hrs, still didn’t like them, he gave me full credit, I tried some GE, half the price, sound great.
Oh Happy Day!