I haven't tried any other tubes with the Havana, so can't be of help there. I've read people really like the Bendix.
After rereading this thread I think I agree with those in the Forest camp. They beautifully constructed speakers, and I found they matched well with a variety of equipment. In my time I had them with Parasound Halo gear, Krell, Bat SS and Aesthetix Tube. They are very engaging speakers and something you wouldn't be unhappy with. They're not the last work in bass reproduction in terms of impact, but their timing and grip is spot on.
After rereading this thread I think I agree with those in the Forest camp. They beautifully constructed speakers, and I found they matched well with a variety of equipment. In my time I had them with Parasound Halo gear, Krell, Bat SS and Aesthetix Tube. They are very engaging speakers and something you wouldn't be unhappy with. They're not the last work in bass reproduction in terms of impact, but their timing and grip is spot on.