A trip to the Chiropractor may be needed after lifting it. Some hum once it has warmed up. Strong and impressive bass with all the speed of a quality solid stater. The 960 plays music with all of its richness that will not fail to please. Feed this baby good power and imput cables to really bring out the bass.
Ceramic cones are a worthwhile consideration.
If you are after a quality tube amp that won't disappoint, this is the one. I have KT88's in mine and the bass and dynamics are unbelievable. I have heard from a tube amp. This amp has a big, bold sound with a palpable and transparent midrange and has a very balanced overall sound. It will benefit greatly from a really good power chord and resonance control.