Sound Scourge Nv73d User manual
User manual
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IMPORTANT SAFETY INSTRUCTIONS
CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK,
DO NOT REMOVE COVER. NO USER-SERVICABLE PARTS
INSIDE. REFER SERVICING TO QUALIFIED SERVICE
PERSONNEL.
The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to
alert the user to the presence of uninsulated dangerous voltage within the product’s
enclosure that may be of sufficient magnitude to constitute a risk of electric shock.
WARNING:TO PREVENT FIRE OR SHOCK HAZARD, DO
NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE
The exclamation point within an equilateral triangle is intended to alert the user to the
presence of important operating and maintenance (servicing) instructions in the manual
accompanying the appliance.
The equipment should be connected to a grounded AC outlet.
Never expose the equipment to rain or humidity.
Follow the instructions in the user manual.
Never attempt to repair the equipment on your own.
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INTRODUCTION
Thank you for purchasing Sound Scourge equipment. The equipment you now own is a result of
many hours of research and development as well as multiple recording and playback tests.
The Nv73d preamplifier is a transistor device with a signal path based solely on discrete elements.
The preamplifier has a transformer balanced microphone input with a high impedance instrumental
input. The preamplifier’s signal output is transformer balanced as well. All the preamp blocks
work in class A.
We have taken a rigorous approach to both components and sound of the preamplifier. The device
is manually assembled from selected parts characterized by a narrow parameter tolerance.
The signal path has been reduced to its minimal length and the signal is guided through top class
rotary switches. Switching impedance, signal phase, etc. is accomplished by hermetically sealed
signal relays.
The screened off power supply has an ample power reserve, which results in stable operation of
the device. Nv73d casing is made of anodized aluminum and all elements are machined with
high accuracy.
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FRONT PANNEL DESCRIPTION
1. Gain. It regulates the sensitivity of the microphone input, and an instrumental HI-Z input.
Gain sensitivity is adjustable in 5 decibel increments ranging from -10 to -65 dB for microphone and
Hi-Z input.
2. Phantom power switch +48V. Switching the phantom power on is indicated by the red LED.
3. 1200/300 input impedance switch. It switches the input transformer winding, changing the input
impedance form 1200ohm to 300ohm. The impedance is reduced to 300 ohms when the button is
pressed.
4. DI instrument input switch. Incoming signal is switched between MIC and HI-Z inputs. When the
button is released, the MIC input is activated, the Hi-Z input is activated when the button is pressed.
5. Signal phase switch . It rotates the output signal phase by 180 degrees, in the balanced output.
6. Output fader. Adjusts the output signal from the OUT socket.
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FRONT PANNEL DESCRIPTION
8. Hi-Z instrument input is used to connect the instruments with high output impedance (guitar,
bass, etc.). It is also suitable for active pickups and electronic instruments like synthesizers or samplers.
The impedance of Hi-Z input is 1Mohm.
The transistor impedance converter is based on a selected J-FET transistor and the output of this
system is directed to the microphone transformer, for revealing the full sound potential of devices
working with Hi-Z input.
7. Microphone input socket. Incoming signal to this socket is transfered directly to the microphone
transformer.
9. Unbalanced output socket. The outgoing signal passes through all amplifying stages of the device
but bypasses the output transformer.
10. Balanced output socket. The output signal from this socket is balanced by a transformer.
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2. AC power on switch.
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BACK PANNEL DESCRIPTION
1. AC power socket.
3. Serial number.
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USAGE
Attention! It is recommended to start the NV73d preamp about 30 minutes prior to recording in
order to stabilize its operating parameters.
The NV73d preamplifier is suitable for any recording circumstances. It is great for recording acoustic
and electric guitars, drum kit and all kinds of vocals. The HI-Z input can be used to record bass guitars
and various electronic instruments. The highly driven preamp will be very helpful for recording
instruments of lower quality, by adding harmonics to their sound. NV73d with a very large dynamics
reserve is not inclined to going to overdrive, allowing you to freely work on the sound.
The amplification of the microphone input is adjustable in the range of the -10 to -65 dB.
Such substantial gain is useful when working with classic ribbon microphones and recording
sound effects for advertising or films. All the whispers, murmurs, and other quiet sounds can be
recorded without unnecessary noise and tedious editing.
We can achieve a psychoacoustic effect of sound concentration by skillfully setting the input stage.
This effect occurs with varying intensity depending on the gain level of processed traces, that is why
the input level should be adjusted to suit your personal taste. At higher gain settings a light
compression of the signal occurs, devoid of side effects, otherwise to using an compressor.
This effect is very desirable if we want to slightly take the edge off the signal amplitude peaks.
NV73d can be successfully used on stage. Owing to a compact casing design with a convenient
carrying handle, and a built-in PSU. In addition to the canonical use as a mic preamp or line, we can
connect the device as a high quality splitter with a galvanicly separated symmetrical output.
For example, using the HI-Z input you can connect your bass guitar, delivering the signal from the
unbalanced output to the bass amplifier, and deliver the signal from the balanced output to the mixing
console.
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SPECIFICATION
Microphone input gain: -10 to -65 dB in 5 dB increments.
HI-Z input gain: -10 to -65 dB in 5 dB increments.
Microphone input impedance: 1200/300 ohm switchable from the front panel.
HI-Z input impedance: 1 Mohm
Output impedance: 75 ohm at 1 kHz.
Frequency response: 20 Hz - 20 kHz +/- 0,5 dB. 20 Hz - 60 kHz +/- 3 dB.
Distortion: 0,07% at 1 kHz.
Maximum output level: +26 dBu at 600 ohm load. (Balanced out.)
Maximum output level: +22 dBu at 600 ohm load. (Unbalanced out.)
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BLOCK DIAGRAM
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WARRANTY
Sound Scourge grants a 24 month warranty for the purchased equipment, guaranteeing that it is void
of any defects in material and workmanship. The equipment has been tested before shipping.
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