Marantz SA11S3

There are seven fuses in the Marantz SA11-S2.
All are small -slow blow. 
All are inside the Player'
So you have to remove the top lid to replace the fuses.
At the back of the player there are 3 screws along the top edge. Remove screws. Slide the lid back about 1/2 inch. It will not want to slide towards the back. You will have to use a thin flat screwdriver to pry it backwards. You will feel it loosen and then you can lift it straight up and off.

Main fuse on is on far left side (looking from front of player) -2.5 amp. Substitute a 3 amp fuse.
There are six rail fuses to various sub circuits.
Two are 1.6 amp
One is 1.25amp
Three are 1 amp

I suggest using 1.6 amp fuses in these locations.
The main power fuse has the greatest single effect.
The other six fuses do add additional improvement.

David Pritchard

David thank you very much for the detailed description. Looks like I need to try one at least the main fuse. 

samzx12:

I think you will be quite happy putting in a Synergistic Research Black fuse in your Marantz. Leave your unit on 24/7. After about 100 hrs, the unit will really sound good.

David Pritchard

I saw the long thread on Synergistic Red Fuse but haven't opened it up but it still blows me away a fuse can improve the sound. In what way not sure but I am willing to try it :)

Yes it is fascinating that the right fuse can have a significant effect on the sound, but it does. I believe you will be very happy with putting in a Synergistic Research "Black" fuse.

David Pritchard