JBL 6233 Amplificador
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Modelo:
6233
Data:
1978
Categoria:
Grupo:
Descrição:
Dual Channel Power Amplifier
Informação
More Than Raw Power
Although high power amplifiers have been available for some
time, they generally have been bulky units designed
primarily for consumer use rather than for the more rigorous
requirements of studio, reinforcement or PA applications.
For the most part, they perform adequately, but lack
reliability when used under road conditions, even with
additional cooling.
The primary design goal was to build a rugged, high power
Amplifier of the highest quality, smallest size and lightest
weight possible. This goal has been achieved in the Model
6233, a reliable, two-channel Amplifier that mounts in three
EIA standard rack spaces and weighs less than 16 kg [35 lb].
Intended for use in recording studios, wide-range sound
systems and similar applications, the 6233 delivers stable,
virtually distortion-free amplification for sustained time
periods at any power level, up to and including full output,
without requiring additional cooling.The 6233 is clean as
well as powerful: Each channel is capable of delivering 300
W continuous sine wave into a 4 Q load, or 200 W into an 8 n
load with total harmonic distortion of less than 0.05%,
20 Hz- 20 kHz. In addition, the two channels can be bridged
for single-channel operation, in which case the 6233 will
deliver 700 W continuous sine wave into 8 Q [the minimum
recommended impedance in the bridged configuration] or 400 W
into 16 Cl, 20 Hz-20 kHz at no more than 0.05% THD.
Input sensitivity of the 6233 is high: full rated output can
be achieved with an input of only 0.77 V. Rise time is 4 us
into a 4 o load or 3 jus into an 8 D load, and the unit has
a slew rate greater than 20 V//xs. The result is accurate,
well-defined high frequency performance that is transparent
and effortless, and which does not become veiled, muddy or
harsh at even the highest power levels.
The 6233 is the first Amplifier in its power class to use an
inverter power supply. This saves weight and space: the 6233
is approximately one-third the size and weight of a
comparable conventional Amplifier, making it far more
convenient to pack and transport. The inverter also provides
transformer isolation from the power line, unlike other
lightweight power supplies.
The inverter power supply uses high-speed switching
technology, long proven in computers, to convert [or, more
correctly, invert] the 50/60 Hz power line frequency to 20
kHz. This allows use of a 0.9 kg (2 lb] transformer instead
of the 23 kg [50 lb] transformer normally required.The
transformer output is then rectified to the DC voltages
required by the Amplifier modules. The inverter power supply
has an output capacity greater than 2 kW, more than enough
reserve to support both Amplifier channels without strain
under any conditions.
Advanced Circuit Design
Full complementary symmetry in each channel’s output stage
allows broad bandwidth without the imbalance inherent in a
quasi-complementary approach. It also helps improve
Amplifier power response, reduce distortion and eliminate
turn-on transients. Fourteen 150 W output transistors per
channel greatly improve reliability, because each transistor
typically operates at only a fraction of its capacity,
regardless of Amplifier power level. '
The 6233 employs forced-air cooling: each transistor is
mounted on an individual heat sink and optimally positioned
in a cooling tunnel extending from the front to the rear of
the Amplifier. A two-speed fan forces air through the
tunnel; thermal sensors in each channel and in the power
supply increase fan speed as required. A thermal protection
device in each channel suspends operation of only that
channel if it overheats, and the device automatically resets
when the module cools to a safe operating temperature. The
6233 will operate in ambient temperatures as high as 50°C
[122°F] without degradation of performance.
Each channel of the 6233 operates independently and is fully
protected against short circuits, mismatched loads,
excessive temperatures and installation errors. Either
channel can enter the protect mode without affecting the
other. The 6233 will remain stable under all conditions,
including operation into reactive loads presented by long
cable lengths and high-quality loudspeakers. Most
importantly, the protective circuitry cannot chatter when
activated. [Chattering, a byproduct typical of the
protective circuitry in large amplifiers, occurs when the
circuitry releases too soon, sending a large burst of
current that can destroy high frequency drivers.]
Versatility
Five sequential indicator lights for each channel allow the
operator to monitor visually the power reserve available.
A unique sensing circuit triggers the top, red light when
the output level is 2 dB below clipping; each successive
light indicates an output level of 6 dB {/ power] less than
the light above it. The lights are far more useful than VU
meters, because they are an accurate performance indicator
even when the power line voltage drops and can also be read
quickly and accurately from a distance.
Any source device capable of driving a load of 20 kn or less
can be used* The Amplifier inputs are unbalanced, the
configuration typical of most applications. However, the
high input sensitivity of the 6233 allows it to achieve full
output when driven by almost any source, balanced or unbalanced.
Tipo de manual:
Serviço e Manual do Usuário
Páginas:
25
Tamanho:
6.63 Mbytes (6950087 Bytes)
Idioma:
english
Revisão:
ID de manual:
Data:
1978 11 01
Qualidade:
Scaned documento, todas legível.
Data de upload:
2017 10 29
MD5:
5551b8606ba737f705344e704637922d
Downloads:
513
Informação
Installation and Service Manual