Since you can DIY and are also somewhat familiar with the ST70, I would suggest that you look into a VTA ST-120 over at tubes4hifi. It is I would say. somewhat based on the old Dynaco but much improved.
The input and driver circuit utilizes a Mullard topology now and there are two versions of the driver board available; one that uses the 12**7 family and one based on the octal 6SN7.
All components including the pre-punched SS chassis and the transformers are new US made parts. At under $1K as a kit, it is most certainly a great deal.
http://www.tubes4hifi.com/bob.htm#ST120
The input and driver circuit utilizes a Mullard topology now and there are two versions of the driver board available; one that uses the 12**7 family and one based on the octal 6SN7.
All components including the pre-punched SS chassis and the transformers are new US made parts. At under $1K as a kit, it is most certainly a great deal.
http://www.tubes4hifi.com/bob.htm#ST120