Manley Stingray Integrated amp.

What are you currently using?

You have a really good preamp. If you are simply looking to make a change to hear tubes with your SFs, I would consider trying the Music Reference RM10MKII, which sound great, is extremely reliable, and uses the wonderful EL84 tube. It gives you 35 watts per channel, don't know if that is enought for your speakers - not sure. All for $1,995 new!. Occasionally they might come up used for $1,200 or so, but you don't see them up for sale that much. Oh, and they get 10,000 of power tube life to boot. Now, if you are looking for an integrated for some reason, that is another issue. I do think the Stingray is one of the better sounding units out there, but there are other options.

I think that Clio9s recommendation of the VAC Avatar SE (EL34) is a good one. If you are looking for warm I'm not sure the RM10 would be recommedation; but I'm not sure that warm is what you are looking for (you may be). What tubes give me is bloom and a sense of space and instrument localization that I can't quite get with SS - and I think it is that quality that turns people into tube fans. I'm a bot confused by the mixed comments here on the Stingray, but I don't doubt that people heard what they heard, or experienced what they experienced, but I agree with Trelja's position on the Stingray. But if you can make the move to the VAC Avatar, I think that would be making the move, your current gear is pretty darn good as is. Just to throw another monkey wrench into this, Roger Modjeski only uses passive preamps with his amps and you could get the RM10 with one of his passives (under $200), but the preamp of yours should work awfully well with just about anything. If you truly want warmth, I would look for an older CJ amp with EL34 tubes, they are quintessentially "warm". Just noticed there is a nice looking SE up for sale today - $2,350 is the asking price.