Mark Levinson JC-2 User Manual
INSTRUCTION MANUAL
for the
JC-2 PREAMPLIFIER
IMPORTANT
Please read these instructions carefully
and completely before operating the JC-2
preamplifier.
A great deal of effort went into the design
and construction of this precision device.
Understanding its functions will enable you
to use it to fullest advantage.
INSTRUCTION MANUAL
for the
JC-2 PREAMPLIFIER
1. INTRODUCTION
The MARK LEVINSON JC-2 PREAMPLIFIER is the distillation of years of
scientific research and careful listening. The amplification circuitry
designed by John Curl combines the advantages of class A, completely
complementary push-pull operation, high open-loop bandwidth, and low
feedback configurations in order to approach perfect solid-state preamplification of the most demanding recorded musical material. Handmatched active and passive components not previously used in consumer
audio equipment eliminate subtle forms of error and distortion which
plague sensitive ears.
Mark Levinson Audio Systems utilizes the finest test equipment in its
product development program. More significantly, a large number of our
staff participate in the evaluation of these developments and refinements. When a product is made available, it is only after it has proved
itself on a wide variety of sophisticated sound systems. To realize the
full potential of these developments is a laborious and difficult task.
But - here is a true designer’s choice for the classic system.
2. UNPACKING THE JC-2
Inspect the unit for damage. It should be physically free of dents and
scratches. If the unit has incurred any damage, contact your dealer
immediately. Retain all packing material for future shipping. Shipments made in anything other than the original carton will invalidate
the warranty, unless authorized by factory.
3. INSTALLATION
3.1. Connectors
The JC-2 is equipped with phono connectors for all audio inputs and outputs. There are two cannon receptacles for connection to the power
supply. A binding post is provided for ground connections to the chassis
of the JC-2.
3.2. Power Supply Connection
The power supply for the JC-2 is mounted in a separate chassis to eliminate hum pick-up.
Check the voltage the power supply comes a cable with a three
power supply label to be sure they correspond to the voltage of
the power source being used.
From one end of the power supply comes a cable with a three
prong AC plug on the end of it. Connect this end to a wall
outlet, using a ground adapter plug if your wall outlet will
not accept three prongs. From the other end of power
supply comes a cable with a cannon connector on the end of
it. Connect this end to the four-pin male cannon connector
on the rear of the JC-2. This should be done before connecting
the JC-2 to the power amplifier because there is a transient
thump when power is first applied to the unit.
POWER SUPPLY CONNECTOR PIN CONFIGURATION: Pin 1 - ground
3.3. Rack Mounting
The JC-2 may be mounted in a standard 19" relay rack. (The rubber feet
may be unscrewed if necessary.) 10-32 screw should fit the threads on
most racks. Be sure to use nylon washers when mounting the JC-2 so as
not to scratch the unit.
4. OPERATION
4.1. Description of Controls
INPUT SELECTOR - selects any one of six inputs. AUX., TUNER, TAPE 1,
TAPE 2, and REMOTE PHONO are all high level inputs. PHONO 1 is an RIAAequalized low level input. The REMOTE PHONO input is an unequalized
high level input. It is intended for use with phono systems having
their own amplification and equalization, such as the EMT turntable/
cartridge system, or certain of strain gauge cartridge.
INPUT/MONITOR
or either of two tape monitor inputs. This switch will not affect the
tape outputs. When making copies from one machine to another through the
JC-2, the playback machine should be directed through the input selector
rather than the input/monitor switch. Tape copies can be made in this
manner without degradation of signal because there are no amplifiers
between the input selector and the tape outputs.
- switches between the program source at the input selector
Pin 2 - + V
Pin 3 - - V
Pin 4 - no connection
Loading...