ADB3b
StereoTube Direct Box
CHANNEL ONE
CHANNEL TWO
GND
LIFT
GND
LIFT
+20 dB
-20 dB
+20 dB
-20 dB
PWR
ADB3b
- 00 dB
0
- 00 dB
0
INPUT
GND LIFT INPUT
GAIN
GAIN
INPUT GND LIFT INPUT
The tube direct box is the DI of choice for hundreds of
studios, engineers, producers, and artists the world over.
Synthesizers, drum machines and samplers, the ADB3
warms up the sound and provides an ideal interface for the
The clear, warm quality of the tube maximizes the sound variety of synthesizer output levels and impedances.
of musical instrument pickups and interfaces. The ADB3 is
a two-channel active impedance matching device utilizing
a 7025 vacuum tube. Unlike solid state active direct
boxes, the ADB3 delivers a warm, slightly compressed
Digital Recording, for eliminating the harsh, often brittle
digital sound.
signal due to the natural softening characteristics of tubes.
Each channel features two 1/4" inputs, an XLR output, a
Ground Lift switch, a 0 to - infinity Pad control, and a +20/-
20 dB input gain switch.
SPECIFICATIONS
Frequency Response: -20 dB Gain: 20Hz - 40kHz, +/-1dB
+20dBGain:50Hz-20kHz,+/-3dB
THD:
.03% (0dB in, -20dB Gain)
1% (-10dB in, +20dB Gain)
>90dB (Gain switch in)
Input: 1/4” unbal.
Output: XLR transformer bal.
100K Ω
600Ω
The ADB3 is housed in a heavy gauge steel chassis for
durability, and is easily mounted to any standard rack tray.
It is ideal for:
Noise Floor:
Connectors:
Bass Players, for interfacing between a preamp and a
mixing board to achieve that warm, tight sound.
Input Impedance:
Output Impedance:
Maximum Input Level: +20dB (Gain switch out)
-10dB (Gain switch in)
Maximum Gain:
Size (WxHxD)
Acoustic Guitarists, the high impedance of the ADB3
insures a perfect pickup match to provide a smooth,
natural sound.
+20dB
7.6” x 1.6” x 5.4”
(194mm x 40mm x 135mm)
2.5lbs (1.135kg)
12VAC 300ma
Electric Guitarists, for a clean DI sound, the ADB3 has a
clear, warm sound that retains all of the natural brilliance
and harmonics for a perfect electric guitar tone.
Weight:
Power:
(Adapter included in US models)
MODEL ADB3
OUTPUT
INPUT
OUTPUT
12VAC
INPUT
300 MA
SERIAL NUMBER
ADB3-
MADE IN U.S.A
CHANNEL ONE
CHANNEL TWO
Bellari is a division of
ROLLS Corporation
5143 South Main Street
Salt Lake City, UT 84107
11/98
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