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RP520
5
Studio Tube Mic Preamp
Channel One Ch
Channel Two
VOLUME
GAIN VOLUME
NORM
+48V
-30dB
LINE
INPUT
- OO
PHANTOM
POWER
INPUT
PAD
+38 dB +65
dB 0
Studio Tube Microphone Preamp
3
0
5
10
20
3
6
dB
CHANNEL ONE CHANNEL TWO
3
5
10
20
dB
NORM
+48V
-30dB
LINE
INPUT
INPUT
PHANTOM
PAD
POWER
0
3
6
GAIN
+38 dB +6
Bellari is a division of
ROLLS Corporation
Salt Lake City, UT
+65
dB 0
- OO
RP520
OWNERS MANUAL
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OPERATION
MICROPHONE INPUT EXAMPLE
Connect a microphone to one of the XLR inputs located on the rear
panel. If the microphone is a condenser type, press in the +48V phantom
power switch. Connect the output to a mixer or recording device. Speak
into the microphone and adjust the GAIN control for a signal level just
below the point at which distortion occurs. Adjust the VOLUME control for
the desired output level.
LINE INPUT EXAMPLE
When mixing down tracks from a digital multitrack recorder, the RP520
may be used to "warm-up" the final mix. Connect the multitrack to a
mixer, and connect the mixer to the line inputs on the RP520. Connect
the outputs of the RP520 to the input of your mixdown deck or other twotrack recording device.
Set the GAIN and VOLUME controls as indicated in the Microphone
Input Example.
INSTRUMENT INPUT EXAMPLE
Connect an instrument such as a guitar or bass guitar to an input of the
RP520, and connect the output to a mixer or recording device. Play the
instrument and adjust the GAIN control for a sound to your liking. Note
that the RP520 can be overdriven to provide a slightly distorted signal,
which may be desired. Adjust the VOLUME control as indicated in the
Microphone Input Example.
NOTE: These are just suggested settings. Your applications may require
different procedures for setup.
BLOCK DIAGRAM
250V
Output
OUTPUT
LEVEL
3
0
5
10
20
3
6
dB
Buffer
30dB
PAD
SWITCH
2
OUTPUT
INPUT
250V
GAIN
PHASE
REVERSE
30dB PAD
2
Congratulations on choosing the Bellari RP520 Studio Tube Preamp. We
recommend that you take a moment and read this manual as it provides
information that will help you in using your unit to it's fullest potential.
The RP520 provides clear sonic quality and performance for the working
musician, studio operator or anyone who needs a preamp with the warm,
smooth, analog sound. Each channel uses one Bellari premium 7025
tube in a unique configuration to give smooth controllable gain with a true
transformer balanced input. The unit has both XLR and 1/4" inputs and
outputs with Pad switches and Phase Reverse switches to adapt to any
performing or studio situation.
INSPECTON
1. Unpack and Inspect the RP520 package
Your RP520 was carefully packed at the factory in a protective carton.
Nonetheless, be sure to examine the unit and the carton for any signs of
damage that may have occurred during shipping. If obvious physical
damage is noticed, contact the carrier immediately to make a damage
claim. We suggest saving the shipping carton and packing materials for
safely transporting the unit in the future.
2. Please complete the Warranty Registration Card and return it to the
factory.
WHY TUBES
The primary purpose of a preamp is to provide low noise gain to microphones and instruments without coloring or distorting the sound in any
way. But any audio electronic device seems to have a characteristic
"sound," sometimes it can be pleasing, sometimes not.
Tube preamps have gained in popularity to counteract the "digital sound"
of digital recording equipment. Many engineers preferred the "sound" of
analog recording equipment, but like the editing and predictability of
digital. Because tubes have natural compression they have a smoother
sound than solid state preamps. When they do clip, they have a more
even harmonic structure. Attempts to duplicate these characteristics with
solid state circuits have met with limited success.
+48 VOLT
PHANTOM POWER
+12
+250
-12
+48
Power Supply
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FRONT PANEL DESCRIPTION
Note: Channel One descriptions are identical to Channel Two
REAR PANEL DESCRIPTION
Note: Channel One descriptions are identical to Channel Two
PHANTOM POWER +48V
Turns on the internal 48 volt power supply for using phantom powered
microphones. It should be left off when not in use.
30 dB Pad
When pressed in, the rear panel XLR input is attenuated by 30 dB. It
does not switch the instrument input.
INSTRUMENT INPUT
1/4" input jack for plugging a guitar, electric bass, or other instrument
direct into the preamp. When this jack is used, the XLR input on the rear
panel is disconnected.
GAIN
Adjusts how much actual gain the preamp has. This is similar to a "trim"
control on some mixers and is different from volume. With the gain set
high the input may be distorted. For best signal to noise ratio this control
should be set as high as possible without distortion, (unless distortion is
desired).
VOLUME
Sets the output level as desired, for best signal to noise ratio it should be
set in the middle of its range or higher.
OUTPUT LEVEL METERS
Each channel of the RP520 has an analog level meter to show the
output level of the tube stage - referenced to +4 dB. NOTE: The meters
respond only to changes in the Gain control. The Volume control will
have no effect on the meters.
PHANTOM
Studio Tube Microphone Preamp
3
0
5
dB 0
10
20
dB
CHANNEL ONE CHANNEL TWO
Channel One Channel Two
GAIN VOLUME
NORM
+48V
-30dB
LINE
INPUT
INPUT
POWER
PAD
- OO
dB 0
PHANTOM
POWER
NORM
+48V
-30dB
LINE
INPUT
INPUT
PAD
VOLUME
GAIN
+38 dB +65+38 dB +65
- OO
3
0
5
10
3
6
3
20
6
dB
RP520
INPUT
Standard XLR type balanced inputs, pin 2 is hot, for Mic or line-level
audio sources. (e.g., instrument, microphone or mixer).
OUTPUT JACKS
1/4" phone connectors or balanced XLRs used for connection to your line
inputs on your load (e.g., DAT, Am p. or mixer).
30 dB Pad
This switch changes the level of the Output XLR jack only. When in, it
attenuates the output level by 30 dB.
PHASE REVERSE
When pressed in, reverses the phase of the output signal 180 degrees
from the input signal.
SERIAL NUMBER
520-
OUTPUT
OUTPUT
CHANNEL
TWO
NORM
REV
PHASE OUTPUT
INPUT
NORM
-30dB
LEVEL
OUTPUT
OUTPUT
CHANNEL
ONE
NORM
REV
PHASE OUTPUT
INPUT
NORM
-30dB
LEVEL
120 VAC
50/60 Hz 15 VA
WARNING:
OR MOISTURE.
MADE IN U.S.A.
CAUTION:
NOT REMOVE BACK. NO USER SERVICABLE PARTS INSIDE. REFER
SERVICING TO QUALIFIED SERVICE PERSONNEL.
RISQUE DE CHOC - NE PAS ENLEVER
NRTL /C
CAUTION
RISK OF ELECTRIC SHOCK
DO NOT EXPOSE THIS EQUIPMENT TO RAIN
TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT
MODEL RP520
DO NOT OPEN
SPECIFICATIONS
Frequency Response 20Hz - 40kHz, +/- 3dB Mic/Line
5Hz - 40kHz inst.
Input Impedance 600 ohm balanced XLR
1M ohm Instrument
THD 0.1% typical
S\N Ratio >107 dB
Max Gain 48dB Inst or line, 70dB XLR
Indicators 2 - LEDs (Phantom Power)
2 - Backlit Analog Meters
Input/Output jacks XLR balanced and 1/4"
Dimensions 3.5" X 6" X 19" (89mm X 162mm X 482mm)
Power 120VAC (230VAC) 15VA
2 3
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TABLE OF CONTENTS
Introduction 1
Inspection
Why Tubes?
Front Panel Description 2
Rear Panel Description 3
Specifications 3
Operation 4
Microphone Input Example
Line Input Example
Instrument Input Example
Warranty 5
LIMITED WARRANTY
This product is warranted to the original consumer purchaser to be
free from defects in materials and workmanship under normal installation, use
and service for a period of one (1) year from the date of purchase as shown on
the purchaser’s receipt.
The obligation of Rolls Corporation under this warranty shall be
limited to repair or replacement (at our option), during the warranty period of
any part which proves defective in material or workmanship under normal
installation, use and service, provided the product is returned to Rolls Corporation, TRANSPORTATION CHARGES PREPAID. Products returned to us or to
an authorized Service Center must be accompanied by a copy of the purchase
receipt. In the absence of such purchase receipt, the warranty period shall be
one (1) year from the date of manufacture.
This warranty shall be invalid if the product is damaged as a result of
defacement, misuse, abuse, neglect, accident, destruction or alteration of the
serial number, improper electrical voltages or currents, repair, alteration or
maintenance by any person or party other than our own service facility or an
authorized Service Center, or any use violative of instructions furnished by us.
This one-year warranty is in lieu of all expressed warranties, obligations or liabilities. ANY IMPLIED WARRANTIES, OBLIGATIONS, OR
LIABILITIES, INCLUDING BUT NOT LIMITED TO THE IMPLIED
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, SHALL BE LIMITED IN DURATION TO THE ONE YEAR
DURATION OF THIS WRITTEN LIMITED WARRANTY. Some states do not
allow limitations on how long an implied warranty lasts, so the above limitation may not apply to you.
IN NO EVENT SHALL WE BE LIABLE FOR ANY SPECIAL,
INCIDENTAL OR CONSEQUENTIAL DAMAGES FOR BREACH OF THIS
OR ANY OTHER WARRANTY, EXPRESSED OR IMPLIED, WHATSOEVER. Some states do not allow the exclusion or limitation of special, incidental or consequential damages so the above limitation or exclusion may not
apply to you. This warranty gives you specific legal rights, and you may also
have other rights which vary from state to state.
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