I've still got my MFA Magus - I bought it in the mid 90's. It is an excellent pre-amp. I wouldn't put it in the same league (or system) as a Yamaha SS amp.
The only issue with this pre-amp might be the output impedence, which is as I recall, 3500 ohms, which rules out a lot of SS amps for consideration if for no other reason than the potential for impedence mismatch.
The only issue with this pre-amp might be the output impedence, which is as I recall, 3500 ohms, which rules out a lot of SS amps for consideration if for no other reason than the potential for impedence mismatch.