wemfan, FPB300 and FPB600 are cut from the same cloth. I prefer the FPB600, felt it had more control, like driving a V8 vs V4. Even around town at low speeds, you always feel the V8 torque and power.
I'm familiar with FPB650 mono so my guess your 350mcx is similar to the FPB600 with better separation.
Before FPBs, I had a Krell KSA100s and it was very very dark in comparison.
At the time, Krell was my favorite SS amp. Great bass, neutral, dynamic but bright and hard and always use MIT cables to tame it. The ONLY reason I sold FPB600 is try something new. It's one of my all time favorite amp with great great memories.
VAC preamp is a great match. It has low impedance so can drive anything. Very sensitive to tube rolling so you can tailor sound to your taste.
I've heard good things on PS Audio BHK preamp so worth checking out.
I'm familiar with FPB650 mono so my guess your 350mcx is similar to the FPB600 with better separation.
Before FPBs, I had a Krell KSA100s and it was very very dark in comparison.
At the time, Krell was my favorite SS amp. Great bass, neutral, dynamic but bright and hard and always use MIT cables to tame it. The ONLY reason I sold FPB600 is try something new. It's one of my all time favorite amp with great great memories.
VAC preamp is a great match. It has low impedance so can drive anything. Very sensitive to tube rolling so you can tailor sound to your taste.
I've heard good things on PS Audio BHK preamp so worth checking out.