Further developments, the fuse had blown again. I replaced it but it blew straight away for the third time. So something is causing the fuse to blow

Hi Guy's My beautiful Anniversary tiny terror has given up the ghost on me, would be grateful for any ideas! The fuse blew first, so I replaced that and following advice from Orange tech guy's I also replaced the power valves with a balanced set of JJ's. The Green light comes on now, and the valves ...