Classe Audio C-103 User manual

CLASSÉ AUDIO
C-103
REMOTE CONTROL
BALANCED LINE PREAMPLIFIER
C-103
OWNER'S MANUAL

C-103 Issue 2 November ‘97
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CLASSÉ DESIGN PHILOSOPHY
1. REPEATED LISTENING DESIGN SESSIONS:
Fine tuning of sound by exchanging and mixing of parts (transistors, capacitors, wiring, PCB boards
etc.), and adjusting many specific operating voltages within proper engineering ranges, producing an
overall sonic recipe giving the most natural harmonic realism of music typical of instruments in a
live performance.
2. UPGRADABLE SINGLE CIRCUIT DESIGNS:
All Classé products (all preamps and all amps) share exactly the same circuit design philosophy
(excluding moving coil and moving magnet phono circuits). This means all amplifiers and all high
level circuits of the preamps benefit from the same design goals. Similar circuits are then tailored to
different power levels etc. Differences between less expensive models and more expensive models
are parts quality and compliment, power supply extravagance and the amount of filtering etc., as
well as features and packaging.
This means that for years Classé has been constantly sonically fine tuning and technically upgrading
this circuit design and its application, thus reaching a very high level of natural musical enjoyment,
as well as excellent reliability which benefits all models - least expensive, most expensive, preamps
and amplifiers alike.
3. EXTREME LONG LIFE IN REAL WORLD CONDITIONS:
Choosing the best attainable quality parts and materials combined with the advantages of the two
above-mentioned areas provides Classé owners with years of proven trouble free reliability and
musical enjoyment.

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C-103
OWNER'S MANUAL
TABLE OF CONTENTS
UNPACKING & SET-UP...…................................................ 4
A.C. LINE POWER................................................................. 5
INPUTS..................................................................................... 6
OUTPUTS................................................................................. 8
FRONT PANEL CONTROLS.……............…....................... 9
FEATURES AND SPECIFICATIONS ……….................... 18

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UNPACKING & SET-UP
Your CLASSÉ C-103 preamplifier has been carefully wrapped in heavy gauge plastic, packed in
semi-rigid foam and contained in a special box. To remove the unit, open and spread the top flaps of the
box. By its sides, lift out the entire unit with foam pieces intact. Remove each foam side by pulling
straight out. Remove the plastic wrap and inspect the unit for any concealed damage. Apart from this
owner's manual, please ensure the following has also been included:
1) DETACHABLE LINECORD.
2) ALLEN KEY FOR TOP COVER.
3) REMOTE CONTROL UNIT (Allen key and Batteries: AAA x 2 included).
Please report any damage or missing parts to your dealer promptly.
This preamplifier, being capable of very high gain, must be located in a position free of any
hum-inducing magnetic fields. (This also applies to turntables and interconnect cables.) Positions
adjacent to power amplifiers, A.C line filters, or regulation devices should be avoided. Ideally, a few feet
should separate the preamplifier from the power amplifier. As well, keep low-level interconnect cables
away from the power amp and separate from A.C. linecords.
Heat generated by the preamplifier is negligible. Air space around the unit need not be a
concern.
Check the Serial Number sticker on the back of the unit for the correct operating voltage.
Regardless of voltage, the internal fuse rating should be 1 AMP SLO-BLO.

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A.C. LINE POWER
The Classé C-103 preamplifier has no power switch. Its low power consumption and improved
sonics from always being ON led to the omission of an ON/OFF switch. In fact, while thoroughly
musical shortly after turn-on, the preamplifier will exhibit "sonic growth" during its first 300 hours of
use.
For optimum sonic performance, you should consider the use of the optional CLASSÉ REFERENCE
A.C. LINECORD. Consult your dealer regarding this accessory.
SAFETY FEATURE:
The C-103 preamplifier is designed with an auto-muting circuit which engages during the initial
20 seconds count down and is indicated by MUTE at the right of the display when the unit is first
connected, or after an AC power failure. After the 20 seconds countdown, the MUTE signal at the right
of the display will be ON thus showing that the unit is in MUTE mode.
This feature will prevent any turn-on surges or unstable output from reaching the power
amplifier and possibly the loudspeakers. Similarly, make sure the MUTE is ON again when removing
A.C. line power.
CAUTION:
DISCONNECT AC LINE CABLE WHILE MAKING ALL CONNECTIONS. "FLOATING THE GROUND” OR
DEFEATING THE GROUND ON A 3-PRONG LINECORD MAY CREATE A SHOCK HAZARD. CONNECT ALL
INTERCONNECT CABLES BETWEEN THE ELECTRONICS BEFORE CONNECTING THE A.C. LINECORDS
TO THE WALL OUTLETS. THIS WILL REDUCE THE POTENTIAL SHOCK HAZARD. SEE ALSO THE
WARRANTY SECTION OF THIS OWNER'S MANUAL.

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INPUTS:
The input jacks are clearly marked on the back of the C-103. The following inputs are
provided: REG 1, REG 2, REG 3, REG 4, BAL 1 and TAPE (see fig. 3, page 14).
REGULAR INPUTS REG 1, REG 2, REG 3 , and REG4:
These are all high level inputs sharing exactly the same characteristics, and may be
interchanged if so desired. A tape machine should only be connected to the TAPE input. See TAPE
IN and TAPE OUT below. The REG 1 input could also be fitted with an OPTIONAL PHONO
BOARD plug in module installed in the unit. A ground screw is provided adjacent to the REG 1
input jack.
INSTALLATION OF THE PHONO BOARD
1) Disconnect the A.C. line cord from the wall outlet.
2) Remove the top cover with the supplied Allen key.
3) Locate and replace the two mounting screws (see Fig.5, page 17) with the supplied stand-offs.
4) Remove jumpers J5, J6, J13 and J14 (see fig. 5, page 17). Check if extension sockets are in
place on the reverse side of the phono board.
5) Install and secure the phono board using the screws removed previously in step 3, make sure
all the connectors are properly aligned.
6) Set MM/MC (see page 18) jumpers to the desired position. All six of these jumpers are located at
the far right of the phono board (see fig .5, page 17). Please note that for ALL HIGH OUTPUT
MC Cartridges, the jumpers have to be SET AT MM.
7) Replace the top cover.

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REMOVAL OF THE PHONO BOARD
1) Disconnect the line cord from the wall outlet.
2) Remove the top cover with the supplied Allen key.
3) Remove the screws securing the phono board, remove the phono board and the stand-offs,
replace the screws where the stand-offs were removed (see fig. 5, page 16) to secure the main
board.
4) Replace jumpers J5, J6, J13 and J14 (see fig. 5, page 16) on the main board. Jumpers from the
phono board can be used for that purpose.
5) Replace the top cover.
BALANCED INPUT BAL 1:
The BALANCED INPUT is a true differential high level input, wired as follows:
PIN 1: GROUND
PIN 2: POSITIVE (NON-INVERTED) SIGNAL
PIN 3: NEGATIVE (INVERTED) SIGNAL
It may be used with CD players that have a balanced output, or any other high level
balanced sources.
TAPE IN
The TAPE IN of the C-103 preamplifier should be connected to the LINE OUT or TAPE
OUT of the tape deck. The TAPE input does not appear on the selector switch. It is activated by the
TAPE switch. (See FRONT PANEL CONTROLS: TAPE BUTTON.)

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IR IN (and OUT)
This will permit you to install an outboard infra-red sensor and therefore be able to control
the C-103 remotely from another room where the outboard IR sensor has been installed. These
connections will be found below the AC power inlet at the back of the unit (see fig.3, page 14).

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OUTPUTS
The Classé C-103 preamplifier has both regular (single-ended) and balanced outputs (see fig.
3, page 14). Both are working at all times, and may be used separately, or simultaneously.
TAPE OUTPUT
Whatever input is selected by the INPUT SELECTOR will be fed to the TAPE OUTPUT
jacks. This should be connected to the TAPE IN or LINE IN of the tape deck.
REGULAR OUTPUTS
Simply connect your regular interconnects to the RCA output jacks marks REGULAR
OUTPUT on the back of the C-103.
BALANCED OUTPUTS
A balanced power amplifier and balanced interconnects are also required. For use with a
balanced power amplifier other than Classé, the wiring of the 3-pin XLR connectors must be wired
as follows:
PIN 1: GROUND
PIN 2: POSITIVE (NON-INVERTED) SIGNAL
PIN 3: NEGATIVE (INVERTED) SIGNAL
If the pin configuration of the power amplifier differs from above, the balanced interconnects
must be modified to accommodate the different power amp.
Having confirmed the correct connections, plug the XLR connectors of the balanced
interconnects into the locking XLR connector on the rear of the C-103 marked BALANCED
OUTPUT. (To remove the connectors, press the tab above the connector.)