Tube amps need high quality output transformers to have a chance of sounding right on low impedences speakers, and the sad fact is that good output transformers are very expensive.
Tube preamps and solid-state preamps tend to cost roughly the same for a given quality level, but because of the cost of output transformers in tube amps, not so with tube and solid-state amps (this would thus hold true for integrated amps).
In short, my experience and my advice is that if your speakers dip below 4 Ohms (most do these days), you are best off pairing a decent solid-state amp with a tube preamp. A lot of people buy them, but a tube amp on the cheap is just that.
Tube preamps and solid-state preamps tend to cost roughly the same for a given quality level, but because of the cost of output transformers in tube amps, not so with tube and solid-state amps (this would thus hold true for integrated amps).
In short, my experience and my advice is that if your speakers dip below 4 Ohms (most do these days), you are best off pairing a decent solid-state amp with a tube preamp. A lot of people buy them, but a tube amp on the cheap is just that.