Here, some "metal" LP's that I think have great sound (of course I'm loosely using the term also):
Extreme - III Sides To Every Story
Metallica - Metallica
Hanoi Rocks - Two Steps From The Move
Queensryche - Empire
Thin Lizzy - Jailbreak, Black Rose
AC/DC - Powerage
Queen - News Of The World, A Day At The Races, The Game