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I have owned my DT25 for a few years now, and it has only seen light rehearsal use and the odd gig here and there. I haven't used my DT25 in a few months due to the lockdown and no rehearsals allowed. I went to try it out on Friday. I switched the power on, with the standby OFF, and noticed that it had a louder mains hum than I remembered, I let it warm up for a minute or so, then flipped the standby switch on, immediately the mains hum increased in volume almost as if someone was rolling the volume up to maximum, ten there was a slight whistle and crackle, followed by a pop or phut, and then no sound. This happened in a few seconds. All the lights were still on, the topology lights swapped when I moved the switches but no sound whatsoever. Switching it off and on made no difference. Just lights but no sound. I tested using both guitar directly in and HELIX LT via L6 LINK. No sound. I checked the fuse that is mounted on the back of the chassis and it looks intact BUT there looks like there are black marks on part of it and a tiny black burn mark dot on the glass. I think its blown. I suspect that some part has failed and the fuse has blown protecting the amp, so I don't think simply replacing the fuse is a good idea. I think it needs to go in to an authorized repair centre to be checked out and very likely repaired. Just wanted to check on here if anyone else has had a similar problem and if so, what it turned out to be? And could it be repaired? Thanks.