API TranZformer GT Guitar Pedal
API TranZformer GT Guitar Pedal
API TranZformer GT Guitar Pedal

API TranZformer GT Guitar Pedal

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API: TranZformer GT Guitar Pedal


  • 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
  • Balanced and Unbalanced Output Phase reverse
  • Balanced Output Ground lift
  • Included 18 volt external power supply optimizes performance
  • Hard wire bypass switch
  • Universal +18VDC power supply
  • Clip LED monitors Input and Output stage clipping

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, transformer output and a hard wire bypass switch. 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.



Input connection:

1/4" Hi-Z unbalanced instrument input

Input Impedance:


Maximum Hi-Z instrument input level before clipping:


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: 7.5kΩ
Balanced Line output: Less than 75Ω

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




Less than 0.01%

Tone Control:

200Hz & 1500Hz Peaking, 5kHz Shelving, continuously-variable boost/cut, +/-16dB range.


Ratio: Varies from 2:1 to 20:1 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:

18VAC @ 1A


8" x 5.5" x 4"

Size (Boxed for Shipping):

10" x 8" x 8"

Actual Weight:


Shipping Weight:



Shipping costs are calculated at time of checkout by our shopping cart, based on the weight of your order and the method of shipment.

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