Which pre should I choose?

faust168-

Consult Accuphase  for parts/service on those older pre-amps prior to any buying.  Those prices are on the high side for vintage pieces as well.

Keep me posted & Happy Listening!

I agree with the suggestion for a tube preamp. It has been the single biggest improvement in my system. I can't speak to the "accuracy" of the sound, but the increased warmth made me want to listen longer than with a solid state unit.

faust168  said..."Aolmrd 1241: Tks for your suggestions. I am afraid the vintage gear will always need repair constantly. It will cost your time and money and inconvenience. Also, I have heard that Tube amp. is not as durable as transister one."

I thought you were interested in vintage gear since you mentioned that the SS preamps you were interested in were up to 24 years old. With that said... try to audition a Primaluna Dialogue Premium preamp. I own one, and it rocks!  Lots of info on line. 

 I cannot see parts availability being a problem either as resistors and capacitors are the same as they were years ago. There is really nothing very new in electronics. 

Good medium priced tube preamps are usually trouble free as the tubes last a long time.