You don't need to worry so much about tubes. Just enjoy their wonderful sound. The Cayin 70T is INCREDIBLE for the money. My neighbor has one and I've heard it with several speakers and it sounds knockout in every way and it autobiasing so there is no worry at all. Besides it looks killer. Also the Consonance tube amps for less money are also fantastic. I don't know the Jungson.
But if you want rich and full sound, you got the wrong speakers. Or you need a sub. YOur room is too large for the Sttafs to ever produce a full sound - no matter what amp you buy. If you're on a really tight budget, I'd suggest you keep the amp you have now and buy a small sub instead. It will do wonders for your sound quality and will give you the most improvement for the dollar. Trust me on this one.
Arthur
But if you want rich and full sound, you got the wrong speakers. Or you need a sub. YOur room is too large for the Sttafs to ever produce a full sound - no matter what amp you buy. If you're on a really tight budget, I'd suggest you keep the amp you have now and buy a small sub instead. It will do wonders for your sound quality and will give you the most improvement for the dollar. Trust me on this one.
Arthur