Coupling caps should be increased in value to allow the extended low end to pass. Some film bypass caps would also open up the top end a bit. Sometimes these use small caps off the pickups to pre filter out noise, removing those also open up the tops. EQ caps should be replaced with Wima MKP-2 polyprop films. I would use a Linear Tech LT1352 opamp as it's very low current draw, high output current drive, imune to cable capacitance, low noise and distortion and a fast 200v/us slew rate.
Proper internal shielding will remove residual buzzes. This includes the entire control cavity as well as the areas underneath the pickups.
Last edited by Jim Williams; 6th August 2007 at 04:21 PM..
Reason: additional thoughts