If this is the right 801, it is not an 'easy' load, rather an amp eater.
No tubes would probably work well, at least electrically.
Good sensitivity helps some, but look at the phase data:
http://www.stereophile.com/content/bw-nautilus-801-loudspeaker-measurements
No tubes would probably work well, at least electrically.
Good sensitivity helps some, but look at the phase data:
http://www.stereophile.com/content/bw-nautilus-801-loudspeaker-measurements