Cayin TA-30 fuse specs and suggestions for upgrade

I am wanting to try an upgraded fuse in my Cayin TA-30 amp but cannot find the ratings other than 250v. Specs for proper ordering and recommendtions for fuse upgrade would be appreciated. Thanks.
Best you contact Steve at CayinUsa. com. He is the distributor and a technical expert on all Cayin/Vas products. Steve s a really nice guy.