Plinius M14 Manuale utente
Phono Preamplifier
2
3
CONGRATULATIONS
CONGRATULATIONSCONGRATULATIONS
CONGRATULATIONS on your decision to become the proud owner of this
Plinius M14 Preamplifier.
This manual has been prepared to help you understand the operation of your amplifier, and to provide
information about its design and the variety of ways it may be used.
We have designed and manufactured this preamplifier to reproduce faithfully and accurately, your
favourite music. With a little care and a full understanding of the operating recommendations in this
manual, your Plinius M14 Phono Preamplifier will provide years of high-quality, trouble-free performance.
Serial Number: ..................................................................................
Date of Manufacture: ..................................................................................
Final Test Certified By: ..................................................................................
IMPORTANT: PLEASE TAKE THE TIME TO READ THIS MANUAL
THOROUGHLY BEFORE USING YOUR PREAMPLIFIER.
4
Introduction ...................................................................................................................................Page 3
Precautions ...................................................................................................................................Page 5
Preamplifier Features – Front Panel .............................................................................................Page 6
Preamplifier Features – Rear Panel ..............................................................................................Page 8
Installation and Operation ............................................................................................................Page 10
Input/Output Connection ..............................................................................................................Page 11
M14 Features ..............................................................................................................................Page 13
Specifications .............................................................................................................................Page 14
Index ...........................................................................................................................................Page 15
Contact Details ............................................................................................................................Page 16
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Please take special note of the following precautions before operating your new preamplifier:
•This preamplifier operates at hazardous voltage levels. We recommend that any work requiring
removal of the lid or base be referred to a suitably qualified and experienced service technician.
•DO NOT attempt to connect any input of this preamplifier to its own outputs.
•DO NOT earth any output terminal or connect any of these terminals together without following the
instructions in this manual or seeking qualified assistance.
•DO NOT place this preamplifier in any position where liquids or any foreign material may
accidentally enter it.
•DO NOT connect any voltage source, short circuit, earth/ground or appliance (other than suitable
audio preamplifiers) to the phono preamplifier output terminals.
•DO NOT connect any voltage source, short circuit, earth/ground or appliance (other than suitable
phono turntable) to the phono preamplifier input terminals.
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The front of the Plinius M14 Preamplifier incorporates all the facilities
you will require on a daily basis.
FRONT PANEL LAYOUT SHOWING GAIN AND CARTRIDGE LOAD
KNOBS, PHASE AND MUTE SWITCHES, AND DISPLAY LED
DISPLAY LED
The Display LED will light whenever the Plinius M14 is operating. The LED will dim (to about half
brightness) when the preamplifier is put into mute.
PHASE SWITCH
Use the phase switch to change the phase response of the Plinius M14 from absolute to inverted 180°.
As labelled on the front panel, absolute phase is selected with the switch to the upper position, and
inverted 180°phase is the lower position.
MUTE SWITCH
Use this switch to mute the output of the Plinius M14. The display LED will dim to show the phono
preamplifier is in mute.
22
47
100
470
1 K
47 K
CARTRIDGE LOAD
GAIN
HIGH
LOW
PLINIUS
14
PHONO PREAMPLIFIER
OPERATE
MUTEPHASE
INVERT
7
GAIN SELECTION KNOB
Use this knob to set the gain of the phono stage to suit your particular phono turntable. When changing
the gain setting, the output of the Plinius M14 is momentarily muted to prevent any transient offset thump.
CARTRIDGE LOAD SELECTION KNOB
The phono cartridge load can be adjusted to suit your particular phono cartridge using this selection knob.
Use the cartridge load selector to set the load to one of six impedance values; 22Ω, 47Ω, 100Ω, 470Ω,
1kΩ, or 47kΩ. In our experience 47kΩis a suitable ‘all round’ setting, although some cartridges seem to
work well into lower values. Please consult your cartridge manufacturer literature for specific
recommendations.
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This panel incorporates all the terminals for connecting the input signals from your phono turntable, CD
player, tuner, etc, and the outputs to the power amp and mains supply.
Please remember that your Plinius M14 Phono Preamplifier is a high quality electronic instrument
capable of an exceptional level of performance. Be sure that you understand your system’s requirements
fully before you make any connection to this phono preamplifier.
REAR PANEL SHOWING INPUT AND OUTPUT TERMINALS,
GROUND LIFT SWITCH, MAINS SWITCH AND MAINS SOCKET.
INPUT TERMINALS
The input terminals of your Plinius M14 Phono Preamplifier are standard RCA terminals for use with single
ended signals from a phono turntable only. It is not wise to connect any other audio source (such as a CD
player) to the inputs of the Plinius M14. Consult your PLINIUS
PLINIUSPLINIUS
PLINIUS dealer for further advice if required.
OUTPUT TERMINALS
Connections for preamplifiers are provided in the centre of the rear panel. Connections are available for
both single ended (RCA type) and balanced (XLR type) cables. Note that the only time the outputs aren’t
‘live’ is when the preamplifier is in mute.
CAUTION
RISK OFELECTRICAL SHOCK
DO NOT OPEN
CAUTION:
TO REDUCE RISK OF
COVER. NO USER SERVICEABLE
PARTS INSIDE. REFER SERVICING TO
QUALIFIED SERVICE PERSONNEL.
CHASSIS
OPEN
CIRCUIT
GROUND
SERIAL No. POWER
CONSUMPTION
50/
60
15 0 V / A
VOLTAGE Hz DESIGNED AND MANUFACTURED IN
NEW ZEALAND BY
AUDIBLE TECHNOLOGIES LTD
P.O. BOX 1836
PAL MERSTON NORTH
PLINIUS MODEL 14 STEREO PHONO PREAMPLIFIER
INPUT OUTPUT RIGHT
PUSH PUSH
OUTPUT LEFT
9
GROUND LIFT SWITCH
This switch allows the signal ground to be disconnected from the chassis. In some installations a hum
loop may exist due to duplicate ground paths from different equipment. Use this switch to remove the
connection from 0V to ground thus allowing some flexibility in your particular set-up.
MAINS SWITCH
The heavy-duty rocker switch to the right of the panel turns the Mains/Line Power to the amplifier ON or
OFF. Depress the right hand side of the switch to turn the amplifier on. The amplifier draws a moderately
high current when switched on, so it is not good practice to rapidly turn the Mains switch on and off
repeatedly.
MAINS POWER CORD IEC SOCKET
This connector is where the mains supply cable from your wall connects to the preamplifier. You will
notice that a fuse holder is mounted within this connection, and it holds a mains fuse to provide surge and
overload protection for your preamplifier.
EARTH POST
This is a chassis connected gold-plated earth post for use with certain phono turntables.
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PLACEMENT AND VENTILATION
Ventilation through and around your Plinius M14 Phono Preamplifier should be kept unimpeded, so
ensure that the heat vents (slots in the lid) are not covered or restricted in any way. Also refrain from
placing the Plinius M14 on top of other electronic equipment to avoid RF interference being introduced to
the highly sensitive phono stage circuitry.
The Plinius M14 design incorporates a very high level of mechanical de-coupling of the input and output.
However, it can still be influenced by acoustical feedback in the operating environment. The use of
acoustic cones or a suitably spiked preamplifier stand or table, may further enhance the performance of
this preamplifier. Consult your PLINIUS
PLINIUSPLINIUS
PLINIUS dealer for further advice if required.
MAINS VOLTAGE CONNECTION
Firstly, check that the mains supply voltage printed on the rear of this preamplifier is similar to the mains
supply voltage in your area. If in doubt, please consult your PLINIUS
PLINIUSPLINIUS
PLINIUS dealer.
Mains supply power connection is via the supplied plug-in lead. A standard IEC socket connects the
mains power at the preamplifier end, while a local mains plug is required at the wall end.
The wiring code used inside all Plinius product is:
Green to Earth/Ground
Green to Earth/GroundGreen to Earth/Ground
Green to Earth/Ground
Blue to Neutral
Blue to NeutralBlue to Neutral
Blue to Neutral
Brown to Phase/Live
Brown to Phase/LiveBrown to Phase/Live
Brown to Phase/Live
Should a ‘local’ plug need fitting to the wall end of the lead, ensure that a suitably qualified service
technician wires the plug correctly.
IMPORTANT: DO NOT POWER UP YOUR PREAMPLIFIER UNTIL YOU
HAVE CONNECTED YOUR INPUT/OUTPUTS CORRECTLY
FOR YOUR SYSTEM, (AS EXPLAINED IN THE NEXT
SECTION).
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