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JHS Colour Box Studio Grade Preamp Pedal
JHS has gone to great lengths to bring the color and character of a real vintage console to your feet or desktop. JHS started with two gain stages in series that produce beautiful clean tones but that can also destroy any signal into a beautiful fuzzy mess full of rich harmonics and body with over 39db of gain on tap. The local feedback of each gain stage makes for a very unique type of distortion. JHS used the same topology and discrete gain stage found in the Neve* 1073 but we have two gain stages in series instead of one. JHS used a high quality Lundahl transformer that adds weight heft and a 3D quality just like preamps that you will find costing much more. The transformer fattens the lows adds harmonic complexity and richness to the midrange (kinda like stirring flour into your drippings to give you gravy) as well as smoothing and rounding of the high frequencies. It also blocks all DC voltages adds electrical isolation and blocks RF frequencies ensuring super quiet operation and noise floor.
The Controls and Jacks?
Think of the controls as three separate sections:
1. Gain (RED)
The gain structure is made up of three parts:
–The Pre Volume (labeled Pre-Vol) can be used the same as you would a Drive knob on an overdrive pedal. In this circuit the Pre Volume is between the two gain stages and the setting of the Pre Volume determines how much signal continues to the second stage.
–The Master Gain (labeled Master) is what would typically be considered as a Volume control. Other terms are master volume or the output trim.
–The Step Gain (labeled Step) changes the gain of each preamp stage in five stages. Rotating the Step knob from left-to-right will increase the gain by the following:
2. Equalizer / Tone Control (BLUE)
The tone control section is a highly modified Baxandall type that is tuned for less control interaction and more boost/cut capability. The center frequencies are Treble 10kHz Middle 1kHz and Bass 120Hz with +/- 17dB of control.
3. Highpass Filter (YELLOW)
The Highpass spans from 60Hz to 800Hz with a 6dB per octave slope. This control allows you to only let high frequencies pass. In return you will find a vast palet of tones that sit perfect and inspire textures that you have never heard from your rig. The toggle switch will turn the Highpass on or off.
In and Out Jacks
You will notice that in addition to the normal 1/4 instrument input/output found on a guitar pedal we added an XLR input and output so that The Colour Box can be used as a vocal bass acoustic or keyboard preamp live or in the studio. The 1/4 mono output and the XLR output are independent and allow you to run parallel outputs to two destinations. For example run the 1/4 mono out into your guitar amplifier and at the same time run the XLR output to your front-of-house mixing board. Another example of using parallel outputs would be to track amp tones and the direct in sound of your performance onto two separate tracks. JHS achieved the parallel output by way of a discrete shunt-feedback circuit.
Input Selector Switch
The input selector switch located above the input jack lets you choose line or microphone input. In the down position it is in mic mode. In the up position it is in line mode.
The Colour Box runs on 18v DC negative center power.