Well, having just gotten my 78 rig up again last weekend and getting pumped from this thread, I went up after work yesterday and started playing 78s. My 11 year old son came in. Touching the equipment...or much of anything...in my music room has been totally off limits to him so far, but over the weekend I began to show him a few things and explain stuff. He's just started trombone this year, so I dropped on some 40s vintage Dorsey, 30s vintage Teagarten, some Glenn Miller, and such. When I played a VERY early acoustic Duke Ellingtion recording of "The Mooche" and told him it was nearly 90 years old he seemed properly impressed. I am proud to say he stayed through it all and it was, in fact, me that reminded him he still had some chores to do.
We got so far as him dropping the needle on the Empire on 78s with the volume down, and rasing it after turning the volume down at the end. and then I showed him that the Shure arm on the LP turntable was about as 12th as heavy and had to be handled with extreme care and locked in place when not being used.
Still a ways to go, but I think he'll be a trained and reliable operator in the not too distant future. I am explaining to him the rare nature and fiduciary responsibility of many of my old recordings and he seems to be taking it seriously.
Good father/son times!
Dave