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: 1pkg Belcat EQ-B2T 2 Band Active EQ Preamp Circuit for Bass Guitar with Output Jack : Musical Instruments
Guyker 2-Band Preamp/Tone Control with Adjustable Gain for JB Bass (with Jazz Bass Control Plate, Dome Control Knobs and Stacked Knob) : Amazon.ca: Musical Instruments, Stage & Studio
Amazon.com: MXR M80 Bass D.I.+ Bass Guitar Preamp Distortion Pedal with Footswitchable Distortion Channel, Noise Gate and XLR Direct Out with 2 Path Cable and 2 Instrument Cable : Musical Instruments