Mitsubishi Pre's and vintage tube amps


I have an opportunity to pick up Mitsubishi DA-P10 and DA-P20 preamps at around $200 each on my local Craigs. Are these any good if combined with vintage tube gear, Dyna ST-70 or ST-35?

Thanks,
Serge
serge_s
Thanks Schubert. PAS-3 was/is my first choice, but when I see something intriguing locally I investigate. Both Mitsus are dual mono and look like quality built, which of course is not a good predictor of SQ:

http://buffalo.craigslist.org/ele/3621349468.html
http://buffalo.craigslist.org/ele/3618119614.html