Mating an AR LS3B with a CJ Sonographe sa 400?

I do not believe that you will have a problem pairing most SS preamps with your Sonographe SA-400. I ran an SA-400 with a CJ PF-R SS pre for a while - it worked very well. I have also paired the SA-400 with an Audio Reseach LS-15 tube unit and it was also a good match. You should have no problems with your LS-3B.

If you do ever want to kick it up a notch; look for a good used CJ PV-12 tube pre.

Paul, which speakers are you using?

Great speakers, assuming that you have the right room for them. As much as I like the Sonographe SA-400, IMHO you will need both a better amp and pre to get the most out of the VR4s. They can be tough speakers on electonics - VERY detailed and revealing. If it were me I would probably replace the LS-3B first.