API Audio GTR Guitar TranZformer
- Proprietary API 2510 OpAmp
- The 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
The API Select TranZformer® GTR incorporates API’s legendary EQ circuit into a versatile and compact guitar effects pedal. Designed to easily fit into your pedal board and engineered to run on standard 9V power supplies, the GTR offers +/- 15dB of gain on 3 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, -20dB output pad, selectable peak/shelf for upper-frequency range, transformer output, and of course the classic API sound.
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
The 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
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: +18VDC @ 650mA
Size: 8″ x 5.5″ x 4″
Size (Boxed for Shipping): 10″ x 8″ x 8″
Actual Weight: 4 lbs.
Shipping Weight: 6 lbs.