I replaced the pads on my AKG Q701 headphones today for the 4th time. It made me realize that I’ve used these headphones for at least 40 hours a week for 14 years straight. I’ve had to repair the left side speaker solder joint a few times, but they’re designed to be easily torn down and repaired. Truly BIFL headphones.
I’ve heard that the newer AKG K702 headphones are identical but I can’t vouch for that. They go for around $250.
I found some K501s on the side of the road a few years ago. The only thing that needed to be fixed was the rubber band in the head band which was easy to replace. Apart from that these things are still perfect and I can see them working for another few decades. Truly great headphones.