Re: difference between a SH-4 JB, an a TB-4 JB?
If he has a Floyd Rose, tell him to get a TB-4 JB. There is no difference between the regular SH-4. The TB-4 just has the polepieces farther apart, this is because the strings are also farther apart on a Floyd Rose. So in order for the polepieces to collect the best signal from the strings, a TB-4 is recommended.