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API Select TranZformer GTR Pedal

EQ, boost, and overdrive pedal incorporating the proprietary API 2510 OpAmp and a signature API output transformer
MFR# TranZformer GTR

Product Description

The API Select TranZformer GTR Guitar Pedal incorporates API’s legendary EQ circuit into a versatile and compact guitar effects pedal. Designed to easily fit on your pedalboard and engineered to run on standard 9V power supplies, the API Audio GTR offers ±15 dB of gain on three specific frequencies.

Additionally, the gain stage can be switched from Clean Boost to Overdrive mode to drive the input OpAmp and add even more tones to your arsenal. Other features include a buffered bypass, -20 dB output pad, selectable peak/shelf for upper frequency range, transformer output, and of course the classic API sound.


When you plug into the TranZformer GTR, the first thing a user sees is the pedal's variable-gain preamp. Filled with classic API character, this preamp includes a Gain knob with roughly 0dB to +40dB of gain, offering more gain for more boost or overdrive. The Mode knob can toggle between an undistorted Clean Boost and an Overdrive mode that helps drive a 2510 op-amp into saturation. Guitarists love the TranZformer GTR's Output Pad, which offers a -20dB pad on your output.

The TranZformer GTR is an API EQ and can fit on any pedalboard! The TranZformer GTR Boost Pedal can be configured as an undistorted clean boost or even as an overdrive that pushes this stompbox's 2510 input amplifier into a full saturation. Users can also get a guitar-optimized three-band equalizer for classic API-style sonic sculpting. A muscular-sounding transformer output can put the final sonic stamp on this guitar effects pedal's iconic API sound. 

The TranZformer GTR Pedal was engineered for high-performance operation through a standard 9-volt power supply. At home in both the studio and on stage, the pro audio quality stompbox boasts high-quality buffered bypass switching for an optimal signal, even if the studio rig includes arena-sized cable runs. An easy-to-see LED indicator helps round out the API TranZformer GTR's outstanding features.

Requires separate power supply. 9 - 18V DC negative center, 2.1 x 5.5mm barrel connector. Do not use more than 18V DC.


  • Proprietary API 2510 OpAmp
  • Signature API output transformer
  • 3-band EQ each with ±15 dB of gain
  • OpAmp overdrive circuit
  • 40 dB of gain
  • -20 dB output pad
  • Buffered bypass

Product Specifications

Condition New
Input Connectors 1/4-inch TS
Output Connectors 1/4-inch TS
Power Supply Required (not included)

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I would like to thank VK for the wonderful sales assistance, service and prices. This was my first purchase with you and it won't be my last. I only wish I'd discovered you years ago!
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In almost 20 years in Pro audio buying, never did I receive a unit so well packed and exactly as described. Works flawlessly. The whole process has been so smooth. I will never hesitate to do business with you guys in the future and will recommend you to everyone I know.
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This was my first experience buying something from Vintage King (although I surf the "used" categories on the website frequently!), and, despite being on the other side of the world, I had absolutely no trouble and everything went very smoothly.
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The speed of delivery exceeded my expectations! I was VERY pleased that my shipment arrived in time for a scheduled vocal tracking session. The packing insured that my order arrived safely. And the sales staff responded quickly to questions regarding the product.
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