KLH model 9 electrostatic Speakers

Will Dynaco st 70 watt good enough power for the nines?

It will run them. But the amp, as good (as a refurbished one is) will be a bit outclassed. 

Yes, they would absorb some power but they would cost only $40 dollars and I bet you would still get 60 Watts out of the M60's. The other thing is the roll off would be way up there and I doubt most of us could hear it?

You can hear it. Its an interesting idea; if the power isn't an issue it might work.

"Will Dynaco st 70 watt good enough power for the nines?"

Depends on how loud you listen. I would love to hear the 9's with something like a Pass XA 60.8. Parasound JC 1+ would be overkill. 
I am not familiar with the Plinius amp but if it sound fine stick with it. It is a 100 watt/ch Class A amp which in my experience should be more than enough. If it sounds anything like my old Krell KMA 100's you should be in hog heaven.

Ralph and Myjostin , I agree to both of you. Thanks

I tried my MIT Speaker Cable with a box , I think it’s the s3 , there is no sound coming out from KLH.

I connected my MIT speaker cables with a box to my KLH , no sound came out. The mit works on my other non electrostatic speakers, I wonder why..