Universal 539-SL

These ballasts have one difference...the top one is Class P. It seems strange that the older top ballast (by only a few months) is thermally protected while the other is not. Perhaps it was an ordering option at the time.

The date code for the top ballast is B-76 and the bottom one is I-76.

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rjluna2
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Robert

The top one is February 1976 and the bottom one is September 1976 as well.

Pretty, please no more Chinese failure.

don93s
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Thanks, Robert!

rjluna2
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Robert

You are welcome, Don

Pretty, please no more Chinese failure.

streetlight98
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Mike McCann

Weird! Wouldn't expect to see a non-thermally protected ballast made as late as 1976! Any ballast I've seen made in the 70s or later has been Class P! Looks like a dated case design for the time too!

To resist is to piss in the wind, anyone who does will end up smelling.

don93s
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I've noticed that all three major brands had 'specialty' ballasts that kept the same original design well through the 70's at least, maybe into 80's...which includes shape, and lack of thermal protection. They must have found a way to be exempt from Class P requirements.