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Component Value Description
R1 47R Choose a value to roughly balance the cartridge impedance. May be omitted altogether.
R2 1k5 Adjust as needed to set the gain.
R3 2k2 Needs to be low for low noise, but high to avoid loading the output of IC1.
R4 2k2 Set to balance R3.
R5 110k RIAA
R6 750k RIAA
R7 33k Keeps the output at zero volts DC. Value not critical.
R8 47R Defines the output impedance. Isolates the output stage from cable capacitance, improving stability.
C1 1.00nF RIAA
C2 2.90nF RIAA (2.2nF||0.68nF)
C3 4.7µF Output coupling. Must be non-polar.
U1 OP27 Input stage. Use OP37 for high gain versions.
U2 OP27 Output stage.
