OK! HOLD ONE A MINUTE!
the JB Proto is NOT like the JB's that came in the old Kramers...
The JB's from 80's Kramers, JBJ's, JB Prototypes and the old vs. new JB has been discussed at great length on the forum many many times...I will break down the basics...
-First, no 2 JB's will be exactally the same DC...the number you see for DC on the tone chart is a general number if you buy a JB it will vary a bit from that number.
-JBJ's are JB pickups wound by MJ and due to the fact that they were stock pickups in lots if old Kramers and the fact that MJ now works in the CS with Seymour some guys say that they have a mojo or magic about them but as far as the specs go the are the same as any other JB
-The JB Prototype is a JB with an Alnico II magnet...the coils are THE SAME as any other JB, the JB Proto has nothing to do with Kramers, George Lynch or MJ in any way
AS for old JB vs. new ones, like I said this has been discussed several times and Evan has even chimmed in on the subject...there is no difference.