put the tubes on the floor and roll... which tube goes further wins : )
What sirspeedy means is swapping different brand and model of tubes (like tires on your car) and you'll get different performance. Some do better in (wet, ice, dry pavement, sand..) clarity, body, extension, and presence.
It takes a lot of lab test ( trial and error ) to get the best performace you want for your taste of music.
It took me over 50 different 6DJ8/6922/7308 (except CCa because they're too expensive) tube families to get the way I like on the SP-11 MK II. I'm not big fan of SP-10 because it sounded a little slow and thick for my taste.
What sirspeedy means is swapping different brand and model of tubes (like tires on your car) and you'll get different performance. Some do better in (wet, ice, dry pavement, sand..) clarity, body, extension, and presence.
It takes a lot of lab test ( trial and error ) to get the best performace you want for your taste of music.
It took me over 50 different 6DJ8/6922/7308 (except CCa because they're too expensive) tube families to get the way I like on the SP-11 MK II. I'm not big fan of SP-10 because it sounded a little slow and thick for my taste.