
Anthony Easton
The ISP Technologies Theta Preamp Pedal is a professional guitar preamplifier with an internal +/-15 volt power supply, providing more than three times the headroom of a typical 9-volt pedal. It brings the full performance of the High Gain section of the THETA amplifier and THETA Rack-mount Preamp down to a foot pedal-based preamplifier pedal.
Key Features:
- Full Pre-Distort Preamplifier and THETA High Gain Distortion Stage
- Implementation of the award-winning Decimator G-string II circuit for noise
reduction
- Controls for Gain, Bass, Midrange boost/cut Level, Midrange Sweep from 300
to 3KHz, Treble, and Preamp Level
- Footswitchable Gain 1 and Gain 2 for selection of crunch and over-the-top
gain
- Dynamic Saturation Modulation circuit emulates the spongy modulated
dynamics of a full-throttle tube amplifier with a vintage tube rectifier power
section
- Dual remote control jacks for MIDI control functions or simple switch
closure
The preamplifier section can be used for clean tone shaping and/or to overdrive the front of the THETA High Gain distortion stage. The THETA distortion circuit offers over 160dB of gain and sustain, with incredible tone shaping flexibility. The inclusion of the on-board Decimator G-String II circuit provides greater than 80dB of noise reduction, ensuring silent operation.
Technical Specifications:
- Internal power supply: +/-15 volts
- Input Impedance: 5000k ohms
- Maximum Gain Preamp+ Distort: Greater than 150dB
- Treble Control / Preamp: +/- 15dB at 10 KHz
The THETA Preamp Pedal is designed for professional use, offering exceptional performance and tone shaping capabilities for discerning guitar players.
Watch the latest video demos and reviews for the Theta Preamp Pedal from YouTube. Stompbx updates this every six months to reflect the most popular reviewers and guitar pedal demos for each pedal.

Below are live Reverb listings for the ISP Technologies Theta Preamp Pedal from Reverb. Stompbx automatically aggregates current offers to give you a quick look at available models, conditions, and prices. Perfect for comparing options and making an informed purchase.

Excellent
$239.99


Discover pedals with similar features or sounds to the Theta Preamp Pedal. This section leverages data to suggest alternatives that complement or expand your pedalboard. Ideal for exploring related sounds or finding a pedal that matches your specific needs.

Lounsberry Pedals
The Nigel

Vox
Ice 9 Overdrive

Darkglass Electronics
Microtubes X7

Foxgear
Ryder (Doug Aldrich Signature)

MXR
Super Badass Distortion

MXR
Raijin Drive Overdrive

Amptweaker
FatMetal

Redbeard Effects
Angry Rhubarb

Lone Wolf Audio
Left Hand Wrath

Origin Effects
RevivalDRIVE Compact

Wren and Cuff
Small Foot Box of War

Movall Audio
Rock Highway

Okko
Diablo

Dwarfcraft Devices
Baby Thundaa

Arion
SDS-1

MXR
M-151 Doubleshot Distortion Pedal
Check out the latest news and articles from around the pedal world.

Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton
Anthony Easton