Re: Need 6l6GC type tube with more upper mids.
I can only tell ya my experiences from what I've tried...I've tried the sovtek 5881, the ruby 6l6gc, and the JJ/tesla 6l6gc.
Out of the three, I like the JJ/teslas the most. I found that they're a bit smoother on the high-end than the others. They go in all my 6l6 amps, and I've never really found a reason to stray.