I just stumbled across this pdf link, see Reply #3: http://www.ybw.com/forums/showthread.php?t=247520 (http://www.ybw.com/forums/showthread.php?t=247520) which leads to http://www.ganssle.com/jack/st4000.pdf (http://www.ganssle.com/jack/st4000.pdf)
I don't have an ST 4000, but given the number of questions that regularly come up about them, I thought this may be helpful to some of you.