Since no one has responded I'll hazard a guess. My Premier 12's use KTK-1 by Limitron. Since the circuits are similar good chance your 11's use the same.
Those fuses are not cheap. Most C/J products use the large KTK fuse. I suggest you call them back and ask for Ed. Tell them you never received a return phone call. They should be able to help you. If the fuse is blowing your amp needs service.
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