In a nutshell, 755 is by far the best phono amp I've experienced at home, among: CH P1+X1, EMT JPA66, Allnic H800, Karen PH1, Phasemation EA1000, Thoeress phono...
There're 3 inputs, 2MC and 1MM. Loading of MC has a very wide range that can cover almost all carts, with 2 levels of gains, 72db and 78 db. MM has also 2 levels of gains: 60db and 66db, and a set of capacitance values to be used. Interestingly, 755 can be used as a pure pre-amp with volume control, but no additional inputs for any digital or external phono sources. Though the manual says 775 has upto 83db gain, I assume it refers to the total gain if 755 is used as a pre-amp to directly drive the amps. Even, the 72db and 78db are a bit over-stated, since I don't feel such a high gain, though enough for most of the carts.
As Valin commented on TAS, 755 is a "bottom-up" phono amp, meaning it is powerful and with a velvet-sounded tone. Due to its power supply design, the 755 gives me a muscular presentation to the carts amplified by 755 and the sound is full of details. Somehow the layers of details are rich enough to give this velvet-sounded or bottom-up feeling, leading people to believe it prioritizes the mid and bass. If you listen with good attention, you don't feel there's anything missing at the top. This is actually quite interesting since most of the Soulution gears are transparent, clean and fast. 755 seems to stand on the other side of the pallet, with rich and analog sound.
It is as quiet as any 2 or 3 chassis phono amp, housing the power supply in one unit. Pitch dark. Sound stage is vast and deep.
(to be continued)