Tube Preamp and SS Amps - How?


I am considering moving to a tube preamp and SS power amp set up. Are there any rules of thumb in getting a proper match and what should I look out for or avoid? Any suggestions or insight would be greatly appreciated!!

Thanks!
stereomaniac
Why not just swap your MA-6450 for an MA-6850? From what I
can tell it's the exact same unit except with a tube preamp
section. The MA-6450 is a terrific amp. I can't imagine the
MA-6850 would be much of an improvement.
Unsound-

I am ALWAYS checking the archives here on the 'gon! This is a fantastic site which I read until I am bleary eyed at 1:00 am in the morning. Thanks to all for your input!!! It is very much appreciated. The Audiogon community is the best!

John
"Golden Ears" reckon SS pre + valve amp; eg Cello with Jadis. And it works. Or valve with valve. The golden rule? Listening!
Try EAR equipment. At the moment I've got a 834L pre (with Jadis valves) + Jadis JA30 + K'Horns. It's a lovely preamp and reasonably cheap.
Or listen to Electrocompaniet stuff.
Last week I listened to so's mega system & was rather disappointed. Genesis 1's with huge Gryphon mono amps. Good but not marvellous. Yet I repember being really bowled over a few years back with same speakers with Jadis JA200's. I think the room is probably to blame more than the equipment.