Their circuit layouts and wiring are pretty unfussy and very old-school. I took the Superline apart at the weekend to tighten up the BNC connectors and as an old fart electronics engineer it was a pleasure to see so many discrete components and hard-wired solder links.
Linn certainly did some great recent upgrades to the LP12 (Keel and Radikal for example). Never been a great fan of their amps..
Actually I am talking about the case, not the circuit layouts, I know it's silly, but...