((((I have located a Cary 200.2 which is a possible start. It would good amp to build on; I had an AES tube preamp by Cary for a few years, and I really liked it.)))))
OP
The AES is a nice affordable tube preamp designed by Dennis now retired from Cary.
When looking at the Cary 200.2 not designed by Dennis it has a lower than normal input impedance and you may experience roll off at the frequency extremes with that preamp.
I would also make sure you can return it and agree with the seller he can guarantee that there is no hum in either channel in that particular amp when you get it.
Best JohnnyR
OP
The AES is a nice affordable tube preamp designed by Dennis now retired from Cary.
When looking at the Cary 200.2 not designed by Dennis it has a lower than normal input impedance and you may experience roll off at the frequency extremes with that preamp.
I would also make sure you can return it and agree with the seller he can guarantee that there is no hum in either channel in that particular amp when you get it.
Best JohnnyR