The SLP-98 is right on the money. If you want to try something a bit less warm, the AE-3 DJH is a nice little pre-amp (that's what I used when I had the Sixpacs).
tube pre amp for cary six pac tube amps
looking for late evening warmth. female vocals, mellow strings from the likes of mark knopfler, cowboy junkies, bonnie rait, eva cassady and the like. cary slp is a natural fit but any other quality tube pre recommendations would be appreciated, budget: +/- $1,500 (used, older but well regarded is therefore my domain). thanks for your thoughts and suggestions, including tube recommendations.