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Charles is correct. Take the preamp over and give it a try. The v4's are very unassuming but sound musical, natural, detailed. Just right. They do require good wire. And, I prefer them with KT 88s. I have tried several preamp as well as direct from my DAC. It took a CJ ET 5 to better the direct connection. Yet Quicksilver's line stage without the remote is another hidden secret. Get the amps and take your time finding the right preamp.
FWIW, I suggest you consider the reverse of your current plan: get a good, tube preamp and pair it with a good SS power amp. This arrangement will give you the advantages inherent in both modes of amplification. And, again FWIW, the Parasound JC-2 preamp has gotten GREAT reviews from most of the major hi-fi mags. The other writers in this thread are correct: take your JC-2 with you to the dealer to test with the Quickie.
I don't know what speakers you're using but I would make the effort to hear them with the Quicksilver V4. If you're really happy with this match I'd be cautious about reversing to tube preamplifier and SS amplifier. If you find the V4 the sound you've been looking for, a SS amplifier will be hard pressed to Sound the same (even fronted by a tube preamp). They're not the same, I'd strongly recommend that you listen to both approaches and decide by simply trusting your ears. There's no substitute for actually listening when this is possible to do so. The speaker's design characteristics and load (ohms) will determine which type of amplifier is the better match for it. You have to listen and go with the one that moves you the most.
An "A" rating from Stereophile doesn't necessarily mean good sound
The dealer could have been expressing his sincere opinion which another listener may or may not agree with. Hopefully Rob can take his preamp to the dealer and hear for himself.Both tubes and transistors have sonic artifacts, they're just different in nature.