preamplifier tone control

P1,P2___________10K Linear Potentiometers (twin concentric-spindle dual gang for stereo) R1_____________100K 1/4W Resistor R2,R6___________18K 1/4W Resistors R3_______________3K3 1/4W Resistor (18K for shelving curves: see Notes) R4,R5____________1K8 1/4W Resistors (10K...