Here it is, the classic OV-14B! The ballast is enormous, even though it is only 175w. It has an interesting set up, to change from 120v to 240v and vice versa, you only have to change one of two pre wired connectors.
BTW, the ballast may look like a single coil, but it is actually a 2 coil regulated output ballast, the other coil is beneath the one you see here, it is a stacked design. If I recall correctly, I think the top part is the secondary coil, the bottom is primary but will need to check again.
Actually this is a regulated output ballast, similar to a CWI. Yes it has capacitors, two in parallel. If you look at the pic closely, you can see them beneath the terminal block.
I've always thought this had a HX ballast lol, I see the caps too, it's a bit of a odd place to put them though. When did they start putting them in the sides instead?
Yeah the OV-12 and the OV-14B caps were hidden! The OV-12 caps were behind a ballast tray plate while the ballast was on the opposite side of the ballast tray!
Interesting, another thing I've noticed is that cap sizes shrunk over the years and that fixtures that used to have two or more caps now only have one cap.