Hi there, this is my first post and I am wondering [ anyone out there knows what the differences between model numbers on Burny Les Pauls is? I know that as the number increases it is a higher end guitar, but how can you tell the difference between a FLG 50 and a FLG 70? I have a Supergrade late 80's early 90's with 2 piece back and 2 piece maple top flame veneered and vh1 pickups but have no idea what model it might be. It's one of the heaviest guitard I have ever picked up but sustaines forever. Also, the bridge pickup was highly microphonic when I got it, I wax potted it which helped a lot but it still squeals like a pig at high gain. pickups have amazing tone though, any ideas on how to get them to calm down? Thanks a lot, M