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.

File information

Download:	Download this File
Filename:	007_1~19.JPG
Album name:	don93s / lighting components
Keywords:	Gear
File Size:	277 KB
Date added:	Jan 09, 2019
Dimensions:	1200 x 900 pixels
Displayed:	51 times
Date Time:	2019:01:09 21:01:00
DateTime Original:	2019:01:09 21:01:00
Exposure Bias:	0 EV
Exposure Time:	1/50 sec
FNumber:	f 3.2
Flash:	No Flash
Focal length:	9.5 mm
Make:	Canon
Model:	Canon PowerShot S2 IS
White Balance:	0
URL:	https://www.lighting-gallery.net/gallery/displayimage.php?pos=-155079
Favorites:	Add to Favorites

Comments

rjluna2
Sr. Member

Offline

Gender: Male

Posts: 268
View Gallery

Robert

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

Pretty, please no more Chinese failure.

don93s
Sr. Member

Offline

Gender: Male

Posts: 425
View Gallery

Thanks, Robert!

rjluna2
Sr. Member

Offline

Gender: Male

Posts: 268
View Gallery

Robert

You are welcome, Don

Pretty, please no more Chinese failure.

streetlight98
Sr. Member

Offline

Gender: Male

Posts: 323
View Gallery

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
Sr. Member

Offline

Gender: Male

Posts: 425
View Gallery

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.