For what it's worth, I have over the years built so many amplifiers that I have realized you can make almost any tube sound simply stunning based on how you design and voice the amplifier.  Since that time I don't get caught up in the current of "what's the best sounding tube" because I understand there isn't one.  The same tube will sound different in every single amplifier so it's really the amplifier that is responsible for making the tube sound great, not the other way around.

Steve

i just got an original Taboo and I'm running a CSP1 in front of it.
i was coming from all solid state stuff. adcom gfa-1a power amp and NAD1020B preamp. cd player is an old NAD a 530 maybe, i forget exactly, it's old. doesn't even have a remote sensor but I like the sound of it ok.

ok, the speakers are some one pi speakers i got used, they are spec'd at 95db but i put a 1ohm resistor in series in the tweeter to pad it down just a bit. i thought this made the speakers pretty balanced and made this change before i got the taboo but while i had the csp1 hooked up to the adcom.

after adding the Taboo to the CSP1, the sound is much more 3dimensional, soundstage is bigger and i like the overall presentation much better. mids sound way better, much more open and the bass sounds better controlled. one thing that i can't really describe is how everything sounds so clean and clear, maybe it's what everyone describes as airy, the idea in my mind is kinda like a perfect darkness or vacuum around the music so it gets all of your attention.

I was worried about 6 watts not being enough and i thought for a while that it wasn't.  
it was loud enough but i would've liked to still have a bit more volume.
sound though was very nice. clean and detailed. i was hearing little things from the recording i've never really noticed before. this was with the 6p15pev tubes. the note the seller put in that bag was that they had 50hours.
rectifier was Mullard 5u4g and driver tube was either a 12at7 or 12au7 by Mullard as well.
in the csp1 i had EH6922 in output sections and 6n1p in driver position with Philco 5u4g rect.

so i decided to swap a few tubes. i put a philco 5y3g in the rectifier position of the csp and then i swapped some tungsram el84 tubes into the Taboo.

there it was...all the volume i wanted with no clipping. just a bit more bass but a little less detail just like Steve describes in the taboo notes. the SV83 were almost to that volume. one which i won't play very often but the el84 got there.

overall i like the EL84 better but i'm wondering if i should swap some different SV83 in there to see if maybe they have a little more output than the sv83 that started clipping...i do have a new (sovtek i think) Cryoset of sv83...still in the shrinkwrapped package...

overall i'm real happy with the sound of my stereo now.

oh yeah, the cd i was playing was Bob Dylan- Time Out of Mind which is actually a pretty nice recording.

only problem now is i was using the phono amp in the NAD 1020B preamp...now i need a phono amp.

Steve, do you have any plans to release a phono kit in the near future???

that sounds great Steve, just what i need  ;)