Amazon.com: 1pkg Belcat EQ-B2T 2 Band Active EQ Preamp Circuit for Bass Guitar with Output Jack : Musical Instruments
Amazon.com: Guyker 2-Band Preamp/Tone Control with Adjustable Gain for JB Bass (with Jazz Bass Control Plate, Dome Control Knobs and Stacked Knob) : Musical Instruments
Fosi Audio P1 Tube Pre-Amplifier Mini Hi-Fi Stereo Buffer Preamp 6J1 Valve & Vacuum Pre-amp with Treble & Bass Tone Control for Home Theater System(with Power Supply) : Amazon.ca: Electronics
Amazon.com: MXR Bass Preamp : Musical Instruments
Ampeg Classic Analog Bass Preamp Pedal : Amazon.in: Musical Instruments
Amazon.com: Radial Bassbone V2 Bass preamp, dual input with EQ, power boost, FX loop & built : Musical Instruments
Amazon.com: Seymour Duncan STC-3ASB Steve Bailey 3-band Preamp Active Pickups : Musical Instruments