Any experiences with FM Acoustics Preamps

Greenfiledhk, a bit late in the day

advise whether the SL Tube PreAmp Ref or RG3 MK4 will be best matched with the KRAFT 300

I have used both these pres (some yrs ago). Sorry to be pedantic, and pls believe me -- there is NO way I can answer the question: the two pre's sound slightly but definitely different.
As you'd expect, they are both an excellent electronic match to the Kraft.

I just heard a FM 255 in my system as well as my friend's and my god, NOTHING prepares you for it as we nearly died of shock in what we heard. We also had a Krell KCT and a Mark Levinson No.32 in hand for A/B/C and once the FM 225 went into the system, it made the other two sounded like a TOY. It is clearly IMO 6+ times better as everything about the sound is so correct, natural, resolution, dynamic, scale, timber.....OMG.....Yoy guys have to hear this thing in action.
It is that good that Im not listening to music with the other pre amps.

I just got my FM 255 MKII as well,,, and I am not going to list other pre-amp brands here, but ... OMG........

The flow of the music is like ,,, geez.. its like FIRETRUCK's Hose vs MOTEL 6 Shower head,,,, HUGE HUGE Difference,,

Once you hear that sound.. everything will seem different,, its almost like um...
the first time I saw MATRIX Movie ! its like eye opening ( but it is also bad , because it is burn a HUGE Hole in your pants. ouch.....)

But if I was restart my audiophile journey again , I will go straight to FM,,and not waste time on other stuff... it is that amazing. ! !!!

Cool! FM is awesome, unfortunately I can only afford used nowadays, really. But, a used FM is better than other makes new,eh?

Jacksonkuo,
if you started now to built a system and you wanted to use as preamp-amps FMA units ,able to drive proprly a pair of kharma mini exq.diamond 87,5 db/8ohm ,which gears you would use as start point?Certainly have to consider the factor badget.