Magnetic ballasts have been around for a long time, and are used in apps such as fluorescent lights.
Outwardly they look extremely simple -- much like a "transformer" ...

... and the way they are usually wired to the fluorescent lamp couldn't be simpler -- there's a connection diagram on the SOLA label above as well as this stand-alone schema.

But I can't seem to readily find a magnetic ballast for my 13W, Bulb: PL-S (Single Tube), Base: 2-Pin (GX23) ( I have seen these with both ELECTRONIC and MAGNETIC ballasts).
That SOLA in the first pic is the direct replacement as is this Philips...

So my question is what's the schematic of the actual coil winding(s)?
Thx!