I can only share experience with the A308, and the A3 integrated amps, as those are the only ones I've owned. I had the 308 with two different speakers. First with the B&W Signature 805's and second with the Revel F30's. It was a great match for the B&W's. They seemed to go together very well. The bottom end was good, midrange was excellent, and so was imaging. The highs were not too bright, and the system seems to be very musically satisfying.
I have a strong feeling that you are going to notice a large difference stepping up to the 308. It is not the solid state version of the Tri Vista namely because it does not use choke regulated power supplies. Although, it is a true dual mono design. A very hefty amp at 55 pounds give or take. Build quality is as to be expected from Musical Fidelity. I'm thrilled with their integrateds. My next step is to try the Nu-Vista integrated. I'm very excited to try it based on my past experiences with MF integrateds. I have never used any plinius gear, but I do know it comes highly recommended. Lately, it seems like you can get a 308 for a very decent price. Somewhere in the ball park of 1700-1800. Worth every penny if you ask me.
I have a strong feeling that you are going to notice a large difference stepping up to the 308. It is not the solid state version of the Tri Vista namely because it does not use choke regulated power supplies. Although, it is a true dual mono design. A very hefty amp at 55 pounds give or take. Build quality is as to be expected from Musical Fidelity. I'm thrilled with their integrateds. My next step is to try the Nu-Vista integrated. I'm very excited to try it based on my past experiences with MF integrateds. I have never used any plinius gear, but I do know it comes highly recommended. Lately, it seems like you can get a 308 for a very decent price. Somewhere in the ball park of 1700-1800. Worth every penny if you ask me.