I have worn several out in another life.
Did you turn them up to 11? I knew this electronics guy who got his start soldering wires for Apollo rockets and NASA. His name (I think he’s still around) was/is John “Dawk” Stillwell of Freeville NY. He had his own business called Dawk Sound Limited. He specialized in amp mods. Ritchie Blackmore, Keith Emerson, and Chris Squires were among his clientele. Back in the ‘70’s Jim Marshall even came stateside to see what Dawk was doing to his amplifiers. Many of the mods became production items.
I'm proud to own a British-made Dual Super Lead 50 watt.
One day I'll convince my wife that I really need a 100 watt plexi full stack in the bedroom. That's my dream anyways!