Assuming you're looking for an integrated, I'd second Celtic66's Jolida rec for either the 1301 or 1501. They're both hybrids, but as such are a great and affordable way to get into tubes. I owned a 1501, loved the sound and would have kept it if I'd bought the remote version and if it had a headphone jack. It responds well to tube rolling, and since it uses only two 12ax7s you can tune the sound to your liking rather inexpensively. If you want a full tube amp, a Cayin A50-T is at the top of my own list right now: incredible transparency, dynamics, bass, air--and for a great price at $1300 new/$900 used. For the money, though, the Jolidas are tremendous bargains and frequently show up here used.