 

The SV-Pre is a JFET preamplifier that has been modeled after the preamp section of the 70s SVT. Each gain stage has been carefully designed to capture the feel of warmth and breakup found on the original amp. Coupled with a cab sim, you could have the monstrous tone of the classic bass amp stack without the challenge of transporting 250 pounds of gear.

 

In addition to the gain stage design, the EQ and tone switches have been designed to give the same response as those on the original amp. The Bass and Treble controls are the standard James stack configuration, having a shelving response of the lows and highs. The eq is flat when at noon.

 

The middle control uses a simulated inductor to emulate the same frequency response and width of the mid control on the SVT. Instead of three fixed frequencies, the frequency knob continuously varies from 220 to 3k Hz. The mid eq is flat when at noon.

 

The Low toggle switch uses the same circuitry as the three-way Ultra lo switch on the SVT. With the toggle to the right, a 2-pole high pass filter is applied, and allows for a more natural drive tone. With the toggle in the middle position, the low end is unaffected. With the toggle in the left position, a slight scoop is applied, emphasizing deep lows and treble frequencies. The Bright toggle switch applies a treble boost, and is more pronounced at lower gain settings.

 

A Master volume knob has been added on the output to set the overall level. Use the Gain knob to set the desired amount of warmth and overdrive. The Gain knob is equivalent the the Volume knob on the 70s SVT.

 

The pedal requires a 9V DC power supply (not included). Do not exceed 9V as this will damage the pedal. The DC supply should be a standard Boss style connector, center negative polarity. The current draw is approximately 20 mA.

 

Power Supply Notes

The JFETs are sensitive to power supply noise. Ideally you should use a clean power supply that is isolated from other pedals (i.e. not daisy chained). Some switch mode power supplies tend to be more noisy and should be avoided. Use a good quality, isolated supply and the SV-Pre will perform with very low noise.

 

The SV-Pre has a true bypass switch.

 

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Review by 
Theo And His Pedals - Red

Demo by Hondo Felder Music

SV-Pre

The Messenger Jr captures the high quality features of its predecessors in the smallest format yet. The Messenger Jr is a high fidelity instrument preamplifier that is perfect for the studio and live performances. The preamp offers a wide array of features in a compact, easy to use format.

Up to 20 dB of clean gain
Shelving bass and treble EQ
Variable low pass and high pass filters
Middle EQ with adjustable frequency
Unbalanced line out and balanced XLR out with ground lift
Volume control for the balanced out signal
Foot switch function can be assigned to either bypass the EQ or mute the signal 

Review by Basschat

Review by reddit /basspedals

Messenger Jr

The Parametric Equalizer offers three bands of equalization with independent control of frequency, bandwidth, and level for each band.

Each band has up to 15 dB of boost or cut. The bandwidth ranges from 0.25 to 2.5 octaves. 
Low - 40 to 400 Hz
Mid - 200 to 2,000 Hz
High - 1,000 to 10,000 Hz

Parametric Equalizer

The Filter FX Loop is a utility pedal used for mixing any external effect with your clean signal while offering filtering, level, and phase controls for further tone shaping.

 The Filter FX Loop works by splitting your signal into two parallel paths: Clean and Effect.

The Clean path has LPF and Level controls (white knobs).
The Effect path has HPF, LPF and Level controls (blue knobs) as well as a phase switch. The HPF is placed before the effect, while the LPF, Level, and Phase controls are post effect.
The two signals are summed together and sent to the output.
 
The filters can be used to alter the feel and performance of an effect. Experiment with your effects to find new possibilities.

Filter FX Loop

The Super Stack is a tube boost with a Fender tone stack EQ. The new production JJ 12AX7 tube is powered by an internal high voltage charge pump, giving the same gain and response as that found in many classic amps.

The EQ is an exact recreation of the Fender tone stack with Mids. It is also the same as the Alembic F2B.

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