Rolls RP520 User Manual
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
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
14
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