Just open it up and see...or if you're lucky, they put the fuse in the female IEC receptacle. I have HiFi fuses in all my gear. Same results as jfrech above.
Hi Fi Tuning Fuses & Ayre
Has anyone installed Hi-Fi Tuning Fuses or other upgraded fuses in his or her Ayre C-5xe cdp or K-1xe preamp? If so, which fuses and what changes did you notice in the sound?