Growing up in the '60's I never saw many dryers that were not timed dry. We had a Bendix gas dryer that went to 60 minutes but it broiled the clothes. I have used Auto-Dry on this 40 year old Maytag since I bought it and everything dries fine.
Ken- Drool! If you own that machine I'm envious LOL. That knob looks so pretty and I love the 140 minute dry with complimentary fluff cycle. Comes in handy not just for 120 volts but also drying large, heavy loads on medium or low heat. I feel that dryers get way to hot on high heat.
You're knob now has me picturing something like this: