How do the Electro Harmonix 6sn7's sound?

Sub par

Thanks Chris...that's what I thought.

I've not heard any, but a friend whose ears I trust says they're somewhat edgy and not very musical sounding. What he says leads me to believe that they sound about as unattractive as the Sovtek 'N7s--thin and edgy, exactly the opposite of the sound I like.

BTW both of us love the sound, overall, of the Ken-Rad copper-post-hollow-filament-tube blackplates, staggered or not--slightly warmly balanced, NOT edgy in the treble, and very musical and attractive. He LOVES the sound of the similarly warmly balanced (and expensive) Brimars, altho they're a little edgy in the treble for me. I find the black-T-angleplates by Tung-Sol and Sylvania to be slightly thin and edgy. RCA black-ladderplates seem to do nothing right and are just boring.

I stumbled into 1 Raytheon-branded Tung-Sol roundplate but haven't listened carefully to it, as I'm looking for a mate for it. They're VERY expensive (as in over $100 each if they test strong), and I may sell the single.

Have you seen this rather-comprehensive thread on 'N7s? http://www4.head-fi.org/forums/showthread.php?t=119638
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It is not a bad sounding tube at all, pretty linear and fast. Sounds about as good as a Syl GTB which means you can do a lot worse.

EHs in general are a little edgy and can be slightly analytical in the highs. I noticed this consistently when tube rolling my CJ MV55, whether it was the EL34s, 6SN7s or 12AX7s. But they aren't bad tubes at all and in a soft system, they may be just right.

Arthur