Repair for Meixing amp?

Anyone know where I can get a mc-34a looked at. It keeps blowing the fuse.

TIA Mark
Have you tried new tubes first?
Is this a new amp? I had that problem when my Ming Da arrived a couple of years ago. The fuse was rated for 220V. For 110 V the fuse needed to be twice as high -- eg 6 amp instead of 3 amp.