I have not yet tried the Black Treasures (and I'm a big fan of those tubes), but I've rolled quite a few other very nice tubes in my LS 100. My favorites so far are Brimar, clear glass, black base with orange lettering. For me these have bested NOS TS round plates, RCA red base 5962's, Sylvania VT-231 bad boys, RCA clear & smoked glass, Pope and KenRad VT-231's.
The Brimars, along with Pope or Sylvania's in the driver position of my 845 amp, seem to be magic.
I'm also using a Mullard fat base gz34 as the rectifier.
Randy