I bought a used Ampeg VH140C in rough condition that went down the first day I had it. Cost me $300+, it has some old Celestion Classic Lead 80s in it that I maybe able to do something with. Maybe use the amp as a cab? I can't have it repaired, it wouldn't be worth it anyway. Is it worthless now? Did I throw away $300?
Could be something simple like the power transistors or even just a pot or a jack. Too little information, sorry.
Are you sure you didn’t just blow a fuse?