API TranZformer GT Guitar Pedal


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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, 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.


    • 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
    • Features Five Year Parts and Labor Warranty
  • Input connection: 1/4" Hi-Z unbalanced instrument input
    Input Impedance: ~500kΩ
    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: 7.5kΩ 
    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
    Noise: -75dBu
    THD+N: Less than 0.01%
    Tone Control: 200Hz & 1500Hz Peaking, 5kHz Shelving, continuously-variable boost/cut, +/-16dB range.
    Compressor: 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
    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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