Tube tuners need to be aligned on a regular basis and Scott tuners need it on a more than regular basis. That would be every few years in some cases. If you don't have someone in your area who can align a tube tuner, I would pass. Otherwise, a good tube tuner is hard to beat as far as sound qaulity goes. Look for a Fisher or McIntosh or a modified Dyna.
Well, I did buy this tuner, 3 days ago. $47 is an unbeatable price. (I can't believe you didn't at least go and see it!) This 350B is in close to perfect condition, but did need a thorough cleaning. I'm listening to it now, all shined up - nice. There were some minor audio issues at first, but after I cleaned and lubricated the front knobs and switches (and left it on for 2 days), these problems evaporated. It still has the original Scott branded and Telefunken tubes! Yes, eventually I will change the ceramic disc caps, but it works close to perfect right now. The only "repair" I made so far was to resolder the tuning knob light socket. Now my Scott 350B glows AND sounds perfect. Alignment? Sure, at some point soon, but I'm not in a hurry. I'm so glad I caught this gem... <img>