Just picked up a 2103 from 1977 today. This is my first 100w amp and I love it! It’s not really any louder than my 50w JMP but it has a rounder and balsier delivery. Some might say more “open”. It’s sounds surprisingly good at very modest volumes. A real eye opener for sure. It’s quite road worn, but not abused! It has the original 80w Mckenzie speakers which sound pretty good. My inspiration for the purchase was the love of Danny Kustows sound from the Tom Robinson Band which I believe was a master volume Marshall. Certainly sounds familiar! More pics of the guts to follow.