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The TranZformer GT is a multifunction pedal that is designed to easily and affordably bring the world-famous analog sound of API to your guitar

Offering the user an unsurpassed level of sonic control, the TranZformer GT combines an API 525 feedback-type compressor with a guitar-optimized 3 band equalizer, both independently in/out switchable. The unit also features phase invert switches on each output, ground lift, clip indicator and transformer output. Like all API products, the TranZformer GT is built to API's exacting standards and remains true to the design philosophy that has made API the leader in professional analog gear for nearly 50 years.


  • Traditional fully discrete API circuit design
  • Variable Compressor with in/out switching
  • 3-Band +/- 15dB Equalizer with in/out switching
  • Input Gain control with +30dB of gain
  • Clip LED indicating Input or Output overloading
  • Balanced and Unbalanced Output Phase reverse
  • Balanced Output Ground lift
  • Included 18 volt external power supply optimizes performance
  • Specifications

    Input connection: 1/4" Hi-Z unbalanced instrument input
    Input Impedance: ~500k
    Maximum Hi-Z instrument input level before clipping: +13dBu

    Output connections
  • 1/4" Hi-Z unbalanced output w/ variable level control
  • XLR Male balanced line output, fixed level
  • *Balanced line output level is +6dB higher than Hi-Z output with Level control fully clockwise.

    Output Impedance:
  • Hi-Z output: 7.5k
  • Balanced Line output: Less than 75

  • Gain Control:
  • 9.2dB - 30dB, Variable, Hi-Z output
  • 15.2dB - 36dB, Variable, Balanced line output

  • Level Control: -inf. to 0dB, Variable, Hi-Z output only

    Maximum output level before clipping
  • Hi-Z Output: +21dBu
  • Balanced Line Out: +27dBu

  • Frequency Response: +0, -0.5, 20-20kHz, both outputs, low-capacitance cable
    Noise: -75dBu
    THD+N: Less than 0.01%
    Tone Control: 200Hz & 1500Hz Peaking, 5kHz Shelving, continuously-variable boost/cut, +/-16dB range.

  • Ratio: Varies from 2: to 20: depending on compressor control setting.
  • Attack (fixed): Less than 5ms
  • Release (fixed): 100ms average (frequency-dependent for natural envelope tracking)
  • Compressor Control (6 Switchable settings): 1 = subtle compression, 6 = maximum compression. Turning clockwise Increases gain reduction (lower threshold) while simultaneously raising output level to match.

  • Power Supply: +18VDC @ 650mA
    Size: 8" x 5.5" x 4"
    Size (Boxed for Shipping): 10" x 8" x 8"
    Actual Weight: 4lbs.
    Shipping Weight: 6lbs.
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