One small bonus: great balance between left and right channel after checking with SPL meter

But I never expected these $20 a pair G.E. tubes to have the best overall tonal balance across the frequency range

There is no need to spend $$70 on three different driver tubes that I tried including a pair of Sylvania driver tubes I picked up for $14.These G.E. tubes are really great and have a terrific full sound as well as great tonal balance

Great imaging and soundstage, excellent excellent balance from top to bottom