Coda FET PREAMPLIFIER 01 User Manual

TECHNOLOGIES INC.

FET PREAMPLIFIER 01

OPERATION MANUAL

SAFETY PRECAUTIONS

INTRODUCTION

INSTALLATION CONNECTIONS

DETAILED INSTALLATION

DESIGN PHILOSOPHY

TECHNICAL DATA

CARE and HANDLING

WARRANTY

WARRANTY REGISTRATION

1

2

3

4

8

11

12

13

14

ADDRESS

15

SAFETY PRECAUTIONS

CAUTION

CAUTION

WARNING

WARNING

CAUTION: TO PREVENT ELECTRIC SHOCK,
DO NOT REMOVE COVER. NO USER

SERVICEABLE PARTS INSIDE, REFER
SERVICING TO QUALIFIED SERVICE
PERSONNEL.

THIS SYMBOL IS TO ALERT YOU OF THE
PRESENCE OF UNINSULATED DANGER­OUS VOLTAGE WITHIN THE UNIT'S
ENCLOSURE THAT MAY BE OF SUFFI­CIENT MAGNITUDE TO CONSTITUTE A
RISK OF ELECTRIC SHOCK.

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1

WARNING:

CAUTION -

THIS SYMBOL IS INTENDED TO ALERT
YOU OF THE PRESENCE OF IMPORTANT
OPERATING AND MAINTENANCE

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TO PREVENT FIRE OR SHOCK HAZARD, DO NOT
EXPOSE THIS UNIT TO RAIN OR MOISTURE. TO
AVOID ELECTRICAL SHOCK, DO NOT OPEN THE
UNIT. REFER SERVICING TO QUALIFIED PERSONNEL.

Never install or remove the power cord from the chassis
unless it has been disconnected from the AC power source
first.
Never pull on the power cord when removing it from an AC

-

power source. Grasp it by the plug.
Do not leave the power cord connected to an AC power

-

source unless it is connected to the unit.

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It is recommend that during extended periods of nonuse
that the units power cord be unpluged from its AC power
source.
Route the AC power cord so that it will not be damaged or

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walked on.

INSTRUCTIONS IN THE LITERATURE
ACCOMPANYING THE UNIT.

INTRODUCTION

This preamplifier is a precision device, designed in an effort to provide the listener with
unmatched sound quality, design, and construction. In order to operate your preamplifier
properly and to realize all of the capabilities of the FET PREAMPLIFIER 01, we recommend

that you read this entire manual carefully.

2

AC LINE INPUT (SEE BOTTOM) GROUND

LEFT

PHONO / LINE

RIGHTRIGHTRIGHTRIGHTRIGHTRIGHTRIGHTRIGHT LEFTLEFTLEFTLEFTLEFTLEFTLEFTLEFT RIGHT

COMPACT DISCTUNERVIDEOINRECORD ONEOUTINRECORD TWOOUTOUTPUT

LEFT RIGHT

BALANCED OUTPUT

INSTALLATION CONNECTIONS

3

The first section of the installation instructions for the FET PREAMPLIFIER 01 is a diagram of
the basic configuration required to bring the preamplifier into an operating mode. These
brief steps will allow you to begin operating your system. Make sure during installation
that the level control is turned fully counter clockwise, all other components are off, and
AC power connections are interrupted to the preamplifier. While the diagram may be
self explanatory, we strongly recommend that you read the detailed instructions

following this introductory section.

POWER AMP

POWER AMP

OUTPUT

INPUT

RECORDER TWO

OUTPUT

INPUT

RECORDER ONE

PHONO / LINE

COMPACT DISC

TUNER

VIDEO

DETAILED INSTALLATION

4

I. Set up and Installation

WARNING: NEVER OPERATE THIS UNIT WITH THE TOP COVER REMOVED. NEVER MAKE ANY

INTERNAL ADJUSTMENTS WHILE THIS UNIT IS CONNECTED TO AN AC POWER SOURCE.

1. If the phono stage has been incorporated in the preamplifier it will be necessary to set
the gain as well as the loading for each channel prior to installing the unit. With the unit
unplugged, remove the cover using the supplied Allen key. The default value for the gain
is “Low", such as would be used with a high output Moving Coil or a Moving Magnet
cartridge. The “High” setting will provide an additional 20dB of gain, if necessary, for

lower output cartridges.

LOW

HIGH

LOW

HIGH

PHONO STAGE

2. In order to set the input loading, it will be necessary to toggle the DIP switches which
are located on the main board of the preamplifier. Each one of these switches connects
a resistor or capacitor in parallel with the input and so adjusts the load value. The default
values are 47k Ohms and 50pF. Refer to the diagram below, which is repeated inside
the unit, to determine the values which need to be switched in for your cartridge.

Replace the cover after setting the switches.

22 22

1000 PF 1000 PF

200 PF 200 PF
100 PF 100 PF

50 PF 50 PF

Ω
Ω

47 47

100 100

Ω

1000 1000

Ω

ON

Ω
Ω
Ω
Ω

ON

DETAILED INSTALLATION

5

3. The balanced outputs are equipped with switchable phasing due to differences in the
USA/EUROPEAN standards. The default setting is EUROPEAN, but may be switched
according to the following diagram.

Note: These switches may also be used for selecting absolute phase .

LEFT RIGHT

_

2

2

1

1

USA

XLR BOARD XLR BOARD

BALANCED OUTPUT

1

+

3

3

1

+

3

3

2

2

_

EUROPEAN

BALANCED OUTPUT

LEFT RIGHT

+

2

3

1

1

__

3

2

+

4. Position the FET PREAMPLIFIER 01 in the space which you have chosen, leaving enough
space to connect the ancillary components of your audio system, and the AC power
cord for the preamplifier. Although the FET PREAMPLIFIER 01 has the ability to reject
external fields that produce system noise, it is recommended that the unit not be placed
near any sources of strong electromagnetic energy.

5. Before installation, make sure all of the power switches of any associated components
are switched off. If any of your other audio components do not have power switches,

make sure they are unplugged from their AC power source.

Note: The Operating Voltage of the FET PREAMPLIFIER 01 is convertible
in order that it may be used worldwide. Contact your dealer to

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arrange altering the operating voltage.