Def Leppard: Pyromania. Vinyl.
I think around the same time I had a K-Tel compilation album called Blast Off. I just looked it up, and I think there may have been a Canadian version that I got somehow because I didn't recognize the album artwork. There was also one I had called Masters of Metal volume 1. Those, Pyromania, Metal Health and Diver Down were the start of my record collection in 1983.
I listened to my dad's ABBA albums and the Cats soundtrack previously. Then one day I saw a Def Leppard video on Good Rockin' Tonight and I've basically been a headbanger ever since.