Jolida 502 with kt 66 or kt90s
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You will get different sonic characteristics depending on the amplifier and the type of tubes you are running. KT88/99 (Sonic Frontiers SFS-80/SFM) type tubes have a warm, but less detailed sound. Amp designs using 6550 (Audio Research vt100) are more detailed, but less warm. Single Ended amps (I've never heard one) are supposed to have a tremendous imaging capability. I've heard some tube amps (new sonic frontiers power 2) that don't have enough tube warmth for my tastes.
I think it is important to think about the speakers you want to use in deciding upon an amp - perhaps a dealer can configure a complete system. My experience with 300B SE amps is that they image well but lack power to handle some dynamics such as the cannon bursts on the 1812 Overture when use with speakers rated at 90db. I have had better luck with amps in the 35-70 amp range utilizing KT88's or KT90's. I would also suggest that you get an amp that has the option for triode or ultra-linear mode such as the Rogue Model 88 amp.