​​​​The TONEMONSTER SEB Series preamps are a cost-effective solution for any instrument equipped with passive magnetic pickups. With a +/- 12dB range for either two (treble/bass) or three (treble/middle/bass) bands of equalization, they are pre wired and ready to install. Best of all they will bring your passive pickups to life! Features include brass shaft potentiometers and a balance potentiometer with a NO SOLDER terminal block for easy pickup connection (neck~shared ground~bridge). For single pickup or pickup selector switch applications simply remove the balance potentiometer.

The SEB Series also features a gain trim potentiometer mounted right on the circuit board (small blue cube) so you can increase or decrease the incoming signal based on the pickup(s) being used. SEB PA+ models feature the PPB v.1 passive/active volume upgrade with a passive tone control. The SEB MT models feature a mids toggle for 250Hz, 500Hz and 800Hz frequencies.

The circuit board, manufactured using Surface Mount Technology (SMT), is covered in epoxy to prevent damage and secure the wiring. Top quality components and meticulous soldering ensures noise free performance. The plastic case (45 X 25 mm) includes an adhesive pad for secure mounting. Powered by a 9V alkaline battery (not included) the circuit can handle up to 18V (2-9V in series) for increased headroom. We offer DIY power upgrades including the BAT-1 (18V) or BAT-2 (9 or 18V switchable).

 SEB-AB - concentric (stacked) treble/bass potentiometer to reduce the number of controls

SEB-B – standard configuration with brass shaft potentiometers for longer life and smoother control

PA+ - passive/active push/pull volume & tone control

MT - selectable mids 250/500/800Hz


Manufactured in South Korea

Pre wired harness ready to install

Brass shaft potentiometers for smoother control and longer life

Center detent on balance and treble/middle/bass potentiometers

+/-12dB range for 2 or 3 bands of equalization

Configurations from 3 to 6 potentiometers

  Gain trim potentiometer for level adjustments

Balance potentiometer with a NO SOLDER terminal block for pickup connection

DIY upgrades available for (18V) power

Bass: +/-12 dB at 100 Hz

Middle +/- 12dB at 800 Hz (SEB3)

Treble: +/-12 dB at 4 kHz

Balance: MN500K w/center detent
Input Impedance: 1Mohm
Current: 0.16 mA
Voltage range: 6 ~ 22 volt
Battery Requirement: 9V alkaline

Standard Potentiometers: 6mm
Concentric (stacked) Potentiometers: 6mm top / 8mm bottom


SEB2-AB (3 pots) Balance~Volume~Treble/Bass

SEB2-B (4 pots) Balance~Volume~Treble~Bass

SEB3-AB (4 pots) Balance~Volume~Treble/Bass~Middle

SEB3-B (5 pots) Balance~Volume~Treble~Middle~Bass

​PA+ - active/passive volume & tone

MT - mids toggle for 250Hz~500Hz~800Hz

*adds a potentiometer