I thought it was listed in the manual. If not, call McCormack (Conrad Johnson) Also, look on the existing fuse. Usually, its type is listed on the fuse. should have amperage, voltage and type(probably slo-blow)
I have the DNA .5 and when I blew a fuse I couldn't find a replacement. All I could get were slo-blo's and this needs a quick-blow. I called Steve McCormack and he had some mailed out. Incredibly nice guy.