I've had trouble with those strips occasionally. Sometimes the are fine other-times I struggle to get a decent looking solder joint. I have since moved on to those ones in my pictures above. AES has them.Thanks for looking, gable.
I wouldn't say I'm 100% confident in any joint soldered to those strips (I found that these didn't take the solder very well, and the holes are really big to fill), but I just shone a light on those, and I think you're seeing reflection. They're full, and the wire's in there pretty good. Still, that is the 6.3V winding, so it couldn't hurt to touch it up. I'll do that.