This is the url for where I got the circuit.
http://ourworld.compuserve.com/homep...den/page12.htm
I found the LM317T got a bit too warm during operation so used the TO3 package LM317K mounted on a small heatsink on the outside of the plastic case. The first circuit will easily handle the EQ5 drive if the regulator substitution is made. For more current look at the second circuit with the pass transistor. He specifies 380 Ohm for 6V, but I found using the standard 390 Ohm resistor only increases the output by about 0.5v, which is fine as new batteries will deliver that anyway. Battery/Box look a bit dusty, but they been outside for a few days
Cheers
Bill