Marantz PM Ki Ruby vs Musical Fidelity M6si

I already checked and it uses a 5x20mm 1.6A fuse. This Marantz PM-KI Ruby definitely needs a High End Fuse.

I had a $6 k Krell vanguard and bought the Marantz ruby integrated .
i know the musical Fidelity’s latest 6 , it is fast and pretty musical 
but the KI Ruby is for sure more fleshed out and involving especially instrumental 
depth and soundstage depth.saying it is harsh as with all quality equipment these amps take a solid 250 
hours to fully run in ,and for sure use a quality power cord , as well as replacing the 2 fuses in there which is a noticeable step up in resolution .and being in Audio for over 40 years ,observing the matched parts quality is much better then MF for sure the preamp is also active with seperate power supplies ,not passive the KI is a dual mono design direct coupled to the Copper speaker terminals, just look at the pictures,the others use cheap brass connectors also preamp is totally isolated and ,volume is regulated microprocessor much better resolution then the plastic carbon volume pots on the MF and copper chassis is $$ for its anti magnetic isolation they put in over a year designing it and voicing it it is a bit tube like but with SS grip and dynamics 
the Ncore modules put out not the stated 100 ,actual 170wpc into 8 ohms 280 into 4 and the  negative current feedback design truly controls Loudspeakers impedance loads. We played maggi 3.7s to the Amphion  3S monitors with  great control and musicality.Ken Isawata  died last year 
just after retiring after 40:years with  Marantz . This was his last effort,
and a very good one at that.RIP Ken, a true Audio pioneer.

I am detailing the parts in the KI Ruby,,I took a quick look inside and I believe there are 
2 fuses ,I will be replacing them ,one to the power supply , behind the IEC the wire loom is partially blocking it,
and the 1.6 amp T or slow blow ?always buy next size up 1.8 ampT if possible for stock fuses can vary over 15% these high end fuses are accurate and can pop
plus the engineers I spoke with and uncle which  is a design engineer said a minimum of 20% over tolerance is built into the design .

do you know the value of the second fuse? I know one is a 1.6A 5x20mm and I like to replace with Furutech blue fuse. the other one I didn't check yet. So, do you recommend use a 2.0A fuse instead 1.6A

I actually have a PM Ki Ruby playing a pair of Revel F208 and had a MF M6si for 3-4 years playing the same speakers and a pair of Monitor Audio Gx300 before them.

I upgraded the M6si to a Pass Labs x250.5 and then I moved it for a second system so I needed a new amplifier and got the PM Ki Ruby.

I need to say both are excelent, the most important difference is the presence of a very good DAC in the M6si.

I never did a direct comparisson but I remember clearly the sound signature of the M6si.

The Marantz has more bass impact and a little warmer sound. The M6si is flatter with more resolution and shows more mids presence. Again the soundstage o the Ruby is three dimensional and shows a lot of depth and is the first thing you will note. Both are very engaging not analytical in anyway.
The cons of the Ruby I would only quote for a little hi frequency sparkle that bothers me in some recordings. The M6si is less engaging but easy on long listening sessions.

I would like to say that a I struggle with the M6si until I discover the impact of speaker cable on it. I am not a snake oil head but in this amplifier the speaker cable has a lot of contribution for the results.
If I could choose now maybe I would prefer the M6si over the PM Ki Ruby but here in Brazil we have limited availability of eletronics and sometimes the prices got a lot higher than the international prices.
Another point is the aesthetics. The PM Ki Ruby is a wonderful piece of equipment and gives a lot of proud of ownership.