I had a 507u and a Leben CS300 for a short time. I found the Luxman to sound a bit thin on my Nines, but with plenty of power. The Leben sounded much better to my ears, but without enough power for a wide range of music. I imagine the Leben 600 would have plenty of juice for them. I am very pleased with my LM Audio EL34 amp, which is also imported by the same folks who import the Leben... Comparable at least in power at 32 watts per channel to the Leben 600, but much cheaper. It does sound great.
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