I have owned a few pair of SFs through the mid 90s into the early 00s, the Concertos, EAIIs, Signums and Grand Pianos. Over that time, my favorite amp for the SF were Brystons. I found that the rock solid nature of the Brystons worked extremely well with the smoother character of the SF...one was the ying to the other's yang...
Good Luck, John
Good Luck, John