SWR Grand Prix – Pre-Owned

Out of Stock

Product Description

The Grand Prix Preamplifier represents state of the art engineering in both design and features for the professional musician who prefers modular type reinforcement systems. The preamplifier is the “heart” of the sound in the electronic portion of the musicians rig. Great care has been taken in selecting the components used, the frequency points and bandwidths of the tone sections, and the attention to flexibility so that this product will remain essential even though the owners applications and needs may change over the years.
The precision electronic section is entirely hand-built and employs everything from a vacuum tube for the preamp section to integrated circuits for the tone sections. The chassis is made entirely of aluminum and is chosen for its repeatable electrical properties and superior resistance to the environment. This is preferable to commonly used steel. The front panel is grained and black anodized while the main chassis, top and bottom are painted satin black. All rotary pots and dual concentric potentiometers are custom made for SWR by Noble, USA. Only four coupling capacitors are found in the signal path and are employed in the tube circuit. They are a very high grade, hermetically sealed polyester or mylar type and come from West Germany.
Features that are unique from previous SWR products are a user optionable high pass filter, a mute function on the XLR record out, a dot bar line level display, a separate headphone amp and a new grounding system that provides for extremely low hum levels.
NOTE: We found that when using high power on stage or when several pieces of rack equipment are housed in the same rack unit, ground loops can occur through the rack rails themselves which tie the individual units together – both electrically and mechanically. This is one reason a “star” type grounding system is used in the Grand Prix. Basically, this means that each part of the circuitry has its individual ground routed via a wire to one common point. From this point, the circuitry is tied to chassis ground through a buss “jumper.” If you have an elaborate rack system or run high power on stage (such as 1000 watts or more) and are experiencing abnormal hum, crosstalk, etc., the buss that connects the internal circuitry of the Grand Prix to the chassis may be removed, totally isolating the circuitry from the rest of your system. This should only be done by a qualified technician (chances are that if you can afford this type of system, you also have your own technician). Please call the factory for details!
We feel that this is one of our finest preamp designs to date and truly hope it brings a new freshness and quality to your playing.

Product Specs/Additional Information

CHASSIS
Size: Single rack space (1.75″) High x 19″ wide x 8.75″ Deep Weight: 5 1/4 pounds
Material: 5052-H32 Aluminum
POWER SUPPLY
All discreet components switchable for 100V, 120V, 220V and 240V operation.
INPUTS
Input Impedance
Passive/Active Input Jack = 800K ohms Active Input Jack = 60K ohms
Effects Return Jack = 27K ohms
Gain @ 1KHz
Passive/Active Input Jack = 71.4
Active Input Jack = 14.3
Effects Return Jack = 1
OUTPUTS
Output Impedance
Effects Send Jack = 10 ohms
Line Out Jack = 100 ohms
Tuner Out Jack = 100 ohms
XLR Balanced Record Out Jack =1.5K ohms XLR Balanced Line Out Jack = 10 ohms Unbalanced Preamp Outs = 10 ohms Maximum Output @ 10K and 600 ohms Effects Send Jack: 9V and 7V RMS
Line Out Jack: 9V and 7V RMS
Tuner Out Jack: 9V and 7V RMS

XLR Balanced Record Out Jack: 10V and 5.5V RMS XLR Balanced Line Out Jack: 18V and 14V RMS Unbalanced Preamp Outs: 9V and 7V RMS
NOISE
Equivalent Input Noise: 2.80 microvolts
Signal to Noise Ratio, unweighted -93db
Typical Unweighted Noise reading less than 200 microvolts
DISTORTION
System Distortion (1V RMS, 600 ohm load, 1 KHz) 0.23% THD
TUBE
(1) Specially selected Groove Tube 12AX7A
DOT BAR DISPLAY
Accurate within .5db

Related Videos

Product Description

The Grand Prix Preamplifier represents state of the art engineering in both design and features for the professional musician who prefers modular type reinforcement systems. The preamplifier is the “heart” of the sound in the electronic portion of the musicians rig. Great care has been taken in selecting the components used, the frequency points and bandwidths of the tone sections, and the attention to flexibility so that this product will remain essential even though the owners applications and needs may change over the years.
The precision electronic section is entirely hand-built and employs everything from a vacuum tube for the preamp section to integrated circuits for the tone sections. The chassis is made entirely of aluminum and is chosen for its repeatable electrical properties and superior resistance to the environment. This is preferable to commonly used steel. The front panel is grained and black anodized while the main chassis, top and bottom are painted satin black. All rotary pots and dual concentric potentiometers are custom made for SWR by Noble, USA. Only four coupling capacitors are found in the signal path and are employed in the tube circuit. They are a very high grade, hermetically sealed polyester or mylar type and come from West Germany.
Features that are unique from previous SWR products are a user optionable high pass filter, a mute function on the XLR record out, a dot bar line level display, a separate headphone amp and a new grounding system that provides for extremely low hum levels.
NOTE: We found that when using high power on stage or when several pieces of rack equipment are housed in the same rack unit, ground loops can occur through the rack rails themselves which tie the individual units together – both electrically and mechanically. This is one reason a “star” type grounding system is used in the Grand Prix. Basically, this means that each part of the circuitry has its individual ground routed via a wire to one common point. From this point, the circuitry is tied to chassis ground through a buss “jumper.” If you have an elaborate rack system or run high power on stage (such as 1000 watts or more) and are experiencing abnormal hum, crosstalk, etc., the buss that connects the internal circuitry of the Grand Prix to the chassis may be removed, totally isolating the circuitry from the rest of your system. This should only be done by a qualified technician (chances are that if you can afford this type of system, you also have your own technician). Please call the factory for details!
We feel that this is one of our finest preamp designs to date and truly hope it brings a new freshness and quality to your playing.

Product Specs

CHASSIS
Size: Single rack space (1.75″) High x 19″ wide x 8.75″ Deep Weight: 5 1/4 pounds
Material: 5052-H32 Aluminum
POWER SUPPLY
All discreet components switchable for 100V, 120V, 220V and 240V operation.
INPUTS
Input Impedance
Passive/Active Input Jack = 800K ohms Active Input Jack = 60K ohms
Effects Return Jack = 27K ohms
Gain @ 1KHz
Passive/Active Input Jack = 71.4
Active Input Jack = 14.3
Effects Return Jack = 1
OUTPUTS
Output Impedance
Effects Send Jack = 10 ohms
Line Out Jack = 100 ohms
Tuner Out Jack = 100 ohms
XLR Balanced Record Out Jack =1.5K ohms XLR Balanced Line Out Jack = 10 ohms Unbalanced Preamp Outs = 10 ohms Maximum Output @ 10K and 600 ohms Effects Send Jack: 9V and 7V RMS
Line Out Jack: 9V and 7V RMS
Tuner Out Jack: 9V and 7V RMS

XLR Balanced Record Out Jack: 10V and 5.5V RMS XLR Balanced Line Out Jack: 18V and 14V RMS Unbalanced Preamp Outs: 9V and 7V RMS
NOISE
Equivalent Input Noise: 2.80 microvolts
Signal to Noise Ratio, unweighted -93db
Typical Unweighted Noise reading less than 200 microvolts
DISTORTION
System Distortion (1V RMS, 600 ohm load, 1 KHz) 0.23% THD
TUBE
(1) Specially selected Groove Tube 12AX7A
DOT BAR DISPLAY
Accurate within .5db

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