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I had this same dryer, purchased April 1978 (electric) and my mom got hers fall of 1979 (gas). The extra care button simply extended the tumble of the cool down for an additional 10 or 15 minutes on the Poly Knits cycle and an added 20 to 25 minutes on the cotton/perm press cycle. It tumbled continuously, not intermittantly like Whirlpool products. With signal "on" the buzzer "buzzed" for 2 minutes nonstop. (In an apartment that would drive you nuts). My first house had the laundry in the garage so it was great there. If you added "extra care" on, then it buzzed for 4 minutes then either 30 seconds or 1 minute every 5 minutes after that. It was also a very loud and obnoxious buzzer with no adjusting of sound level. Another difference with the 19788, there was no "electronic control" plastic thing right behind the lint filter. The strips were just simply inside facing inside toward the drum. Mine wasn't very accurate. "Light" handled just about everything. "Normal" dealt with towel loads well. "Heavy" was overkill. Also, on my panel,l instead iof "special" on the heat column (right side of button), both my momj's and my dryer had Normal Heat. My sister had std. capacity version of this dryer from 1977 with the exact same arrangement. I also had a no-tumble rack ya hooked on the holes in the door--shaped like a tongue.
