Going for similar power, I've compared it to a Scott 299 and Eico 2036 (similar to an Eico HF81). They all sounded good. The Eico was more stereotypically 'tubey' sounding. Gooey, thick, fun. The Scott was closer to the Leben but not nearly as transparent, not as open, not as clean but had a bit more color and overt tone, to the point where it felt like it was adding it instead of playing it, but not to the point where that was necessarily bad. I've had the Leben on older speakers but nothing like a big Altec horn, which just aren't generally to my liking.Has anyone compared between Leben and vintage tube amp? Or even power an vintage speakers?