Fender Replacement Concentric Control Potentiometer (CTS) Go to amazon.com Related posts The 10 best 500k potentiometer concentric FeatureReplacement Concentric Control PotentiometerReplacement concentric vol/tone control on the Fender '62 American Vintage Jazz BassOriginal CTS part DescriptionReplacement Concentric Control Potentiometer. Replacement concentric vol/tone control on the Fender '62 American Vintage Jazz Bass. Original CTS part.