The back of the panel is a 3AG Fuse 4amp. One recommendation I can suggest to you is the Furutech TF-4A (32mm), would be a great upgrade from that. We sell them if you are interested.
Magnepan MG1.7 fuse question
I have placed an order for a pair of 1.7s. I want to upgrade the fuses but I don't know what spec is shown on the back place for the fuse. One person thought the spec was for a 4amp but I thought that seemed high. Could someone please let me know what the amp size it is. I assume it's a fast blow. Any help would be appreciated.