Here is my 1975 cordova wrap slingerland 3ply I purchased in October. It has new bottom rims and front hoop. I put ambassadors on the top and Ludwig mediums on the bottom of the toms. I have the 12 and 13 a minor 3rd apart and the 16 a fifth lower than the 13. I don't know if this is right but it's a place to start. The top head is tuned one step highter than the bottom on the racks and the floor reso is a minor third higher that the top head. I really like this set compared to my rockstar. It was a lot easier to tune. This is my second drumset.
peg