My Dad. He owned a shop in the 50's-60's (he died in '66). They did sales, service, and installation of Audio, TV, and Communications (ie intercoms). I would go to the shop with him on Saturday, while he and his partner worked repairing customers gear he sat me down with a screw driver, pliers, and an old broken piece of gear so I could "work on it". I was 6-7 or so. We always had a decent hifi in the house too. And I had my own system when I was a teenager. Of course I didn't really become an audiophile until college. That's when I found how much difference there was in consumer gear and the hi end.