The API Select TranZformer GTR is a compact, high-performance guitar EQ and boost pedal engineered with a signature API output transformer, delivering a versatile range of tonal control and gain-shaping capabilities.

EQ and Gain Architecture

The pedal features a precision 3-band EQ with ±15 dB of gain on selected low, mid, and high frequency ranges. Users can toggle the high band between a shelving and peak mode to sculpt the upper register with greater flexibility. This EQ circuit stems directly from API’s renowned studio heritage, bringing professional-grade tonal shaping to pedalboard setups.

Drive and Output Control

The onboard gain stage offers two distinct modes: Clean Boost for transparent amplification and Overdrive for pushing the input OpAmp, creating rich harmonic saturation. The pedal provides up to 40 dB of gain, ideal for driving amplifiers or hitting front-end pedals harder. A -20 dB output pad allows the player to maintain signal integrity when interfacing with sensitive downstream gear or during line-level routing.

Transformer and Signal Integrity

Central to its tone is the API signature output transformer, delivering a classic, punchy character associated with the brand's analogue circuitry. Buffered bypass ensures signal strength and clarity are preserved when the pedal is disengaged, minimising high-frequency loss over longer cable runs.

Design and Power

Housed in a rugged chassis, the TranZformer GTR integrates seamlessly into standard pedalboards and operates on a conventional 9V power supply, maintaining compatibility with typical stage and studio setups.