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Tung-Sol 6550
"Lots more girth in my tone, and they break up with a nice, Marshall-like grind just at the right volume."
SED 6L6GC
Very rich and 3 dimensional. Articulate in the mids.
Penta KT88SC
"I think the bass is a tad fuller and the top end is smoother, more refined, and has more detail."