Stash of NOS 2011 FPolc Sun-Tech Photocells

From Ryan (thanks!). Here we have one dozen 480V yellow Sun-Tech PCs. Here's the awesome part: they all work on 120V! (Well the six in the plastic I did not test, but they're all identical and the six out of the plastic tested just fine). One is opened up and the cover is on its side for viewing purposes. Very sensitive PCs too. They must be 1.0ftc.

The opened one acts a little funny. Initially, it would shut off as normal and then come back on, even in broad daylight. Then I was able to get it working, but I noticed that it will only work once (it'll shut off and remain off until "dusk" and then at "dawn" it will remain on and become a dayburner until power is shut off and turned back on. then it will work for one cycle and dayburn again. Weird...

I wonder if that is the typical fail mode of those faulty Sun-Techs? For them to work for one cycle and then dayburn? Maybe that's why there were so many dayburners, as they weren't getting detected? IDK lol.