No issue with using a fuse with a higher voltage rating - as long as the current rating is the same.
Not exactly on topic, but close; has anyone had problems with the 2 amp AC fuse blowing on the 25? Mine went for no apparent reason and I cannot see anything inside the case that looks out of the ordinary. There is no sign on any component that would indicate a problem. I have just ordered 5 new fuses so will be trying one out when they arrive (couple of weeks, unfortunately) to see if it blows immediately or ??
Any experiences like that?