I can remember an episode of Dallas where a smoke alarm sounds, well thanks to TVTropes I found it, at least the episode before the one I remember.
S6E28 Ewing Inferno. It features an SA120 with a modified light (bulb is producing a white colored light) doing 5/6.
https://youtu.be/l-fG-cQAdNM 2:44
The episode I remember must have been S7E1 where another lower pitched alarm is also heard near the bedrooms.