Charles -
We replaced the 1974 machine in January 1983 when we moved to Charlotte. I lost track of the '74 in the late 90s when my friend/co-worker passed away. They had the machine much longer than we did - for something like 15 or 16 years, I think with one repair.
We replaced the '74 because we did not have a matching dryer, and the dryer we had was gas, and we needed electric in Charlotte. So, Mom replaced both with a new matching set to celebrate moving to Charlotte. We got a very common 1981 model 70-series (that was built well into 1983). By that time the DA had spread into the seventy series machines.
You're right Charles about the DA - in the 1978 models it had not yet filtered to the 70-series, in fact I think some 80-series didn't have it yet either. The same was true for the '79 models, then in 1980 the upper level 70-series machines got the DA, then by 1981 all the 70s had it, and in 1983, even one 60 had it.
Malcolm -
Thanks for the Avatar comment. I love that machine. That is my mother's first model, and thanks to James/70-Series here, he knew of a club member in Roanoke who had the machine, and I was able to get it, and become friends with him at the same time. If I get another one of these perhaps I'll let one go, however for now it's got a long-term home. I have collected one of each of my Mom's three Kenmores, and soon I'm going to have them all home and connected for use.
Gordon