are you saying the shutoff is soldered on both sides???i may have read you wrong,that would be a 1st for me,i'd go for the repack if you got summin funky like that..i,d be surprised if its as you state,i agree w/spruce i pic will help
Sounds like it's some kind of inline device rather than a stub out. Around here I still see a lot of saddle valves used.
Be sure you live your life, because you are a long time dead.-Scottish Proverb