Kt88, this is a question that comes up every month or two and seems to get pretty much the sames replies. The fact you requested a tube tuner is a little different than most and I am not familiar with those, but there are people that really like the tube tuners.
For best bang for your buck, I would recommend a vintage tuner. There were some great tuners made through the 70's and early 80's when they were more popular, for whatever reason.
As an example, I used the Fanfare FT-1A tuner for over a year, it is a nice tuner and I really enjoyed it, but I sold it and purchased a Yamaha T-2 from the late 70's early 80's. The T-2 has and edge, IMO, in performance but the Fanfare has the remote and presets. But I purchased the T-2 for $368!
I recommend that you spend a little time at this site: http://www.geocities.com/tunerinfo/
Also, you may want to contact Don Scott at bdscott@nac.net.