Dynaco ST-70

I wouldn't presume to comment on the Wright or B & W based on never having heard either.

But would be greatly interested on what members would recomend as a pre for the st 70.

The ST-70 can be driven easily by any preamp made. The real issue is that the speakers are low efficiency- 88db, so the issue is whether or not 35 watts will be enough in your room with your listening habits.

I used a PAS 3 but that was a long time ago. I had one for a short while about 15 years ago and used both SS and a tube hybrid preamps so any should work. Agree that you might want more power, what about the mono MK 3s? Sixty watts per channel.