I strongly second Jcbtubes' mention of Spectral & Symphonic Line (the Kraft series) from experience with an earlier (?) model of your speakers (the cls).
Among the other, excellent, recommendations, I have only experienced the 33H with cls -- but prefer the sound of the two other models mentioned above.
Note that it's just my taste, and I listen to classical & blues, some jazz.
BTW both Spectral & Symphonic Line are wide-bandwidth designs, if you're into that sort of thing...
Another tube that MAY fit your bill is the Tenor; I say "may" because I'm not sure of their driving power (nominal 75W) and, I've only heard these with box speakers -- was very impressed.
Cheers
Among the other, excellent, recommendations, I have only experienced the 33H with cls -- but prefer the sound of the two other models mentioned above.
Note that it's just my taste, and I listen to classical & blues, some jazz.
BTW both Spectral & Symphonic Line are wide-bandwidth designs, if you're into that sort of thing...
Another tube that MAY fit your bill is the Tenor; I say "may" because I'm not sure of their driving power (nominal 75W) and, I've only heard these with box speakers -- was very impressed.
Cheers