AMC CVT2030 User guide

AMC CVT2030
VALVE POWER
AMPLIFIER
INSTRUCTIONS FOR INSTALLATION AND OPERATION

CAUTION: TO REDUCE
THE RISK OF ELECTRIC
SHOCK, DO NOT REMOVE
COVER (OR BACK).
NO USER-SERVICEABLE
PARTS INSIDE. REFER
SERVICING TO QUALIFIED
SERVICE PERSONNEL.
AFIN DEVITER UN
CHOC ELECTRIQUE
ET LES CONSEQUENCES
GRAVES QUI POURRAIENT
EN RESULTER, TENTEZ
PAS D’OUVRIR L'APPAREIL
ET DE TOUCHER AUX
COMPOS ANTS INTERNES
SANS LA PRESENCE D’UNE
PERSONNE QUALIFIEE.
PARA REDUCIR EL RIESGO
DE SACUDIDAS ELECTRICAS,
NO DEBERA QUITARSE LA
TAPA (Nl PARTE POSTERIOR).
CONSULTESE AL PERSONAL
CAPACITADO PARA LAS
REPARACIONES INTERNAS.
WARNING: TO PREVENT FIRE OR ELECTRIC SHOCK, DO NOT EXPOSE THIS APPLIANCE TO RAIN OR
MOISTURE.
ADVERTENICIA: PARA EVITAR EL RIESGO DE INCENDIO O SACUDIDA ELECTRICA, NO DEBERA EXPONERSE
ESTE APARATO A LA LLUVIA O HUMEDAD.
CAUTION: TO PREVENT ELECTRIC SHOCK DO NOT USETHIS (POLARISED) PLUG WITH AN EXTENSION CORD,
RECEPTACLE OR OTHER OUTLET UNLESS THE BLADES CAN BE FULLY INSERTED TO PREVENT BLADE
EXPOSURE.
ATTENTION: POUR PREVENIR LES CHOCS ELECTRIQUES NE PAS UTILISER CETTE FICHE POLARISEE AVEC
UN PROLONGATEUR. UNE PRISE DE COURANT OU UNE AUTRE SORTIE DE COURANT, SAUF SILES LAMES
PEUVENT ETRE INSEREES A FOND SANS EN LAISSER AUCuNE PARTIE FOND SANS EN LAISSER AUCUNE
PARTIE A DECOUVERT.
PRECAUCION: PARA EVITAR SACUDIDAS ELECTRICAS, NO DEBERA UTILIZARSE ESTA CLAVIJA POLARIZADA
CON UN CORDON DE PROLONGACION, RECEPTACULO U OTRO TIPO DE SALIDA A MENOS QUE SE HAYAN
INSERTASO COMPLETAMENTE LAS LENGUETAS PARA EVITAR SU EXPOSICION.
NOTE: Some AMC products are equipped with dual or multi-voltage transformers (which is indicated on the back
panel). If you wish to change the voltage, please bring your unit to an authorised AMC service technician for internal
conversion.
ATTENTION: Quelques pieces AMC sont munies de transformateurs k double ou a multi-voltage (indique au
panneau arriere). Si vous voulez changer le voltage, veuillez apporter votre appareil au fournisseur de AMC pour
le transformer.
ZUR BEACHTUNG: Einige AMC Gerate sind mit Umschaltern fur unterschiedliche Netzspannungern ausgerustet
(Ein Vermerk auf der Ruckseite weist darauf hin).
Die Anpassung, wenn notwendig, mu(3 von einem qualifizieren Techniker in einer AMC Servicestation vorgenommen
werden.
NOTA: Ciertos componentes de AMC estan dotados de transformadores de doble tension o de varias tensiones
(lo que se indica en el panel posterior). Si se desea cambiar la tension, sirvanse llevar el aparato a un tecnico
autorizado por AMC para su conversion interna.
NOTE to CATV systems installer: This reminder is provided to call the CATV system installer’s attention to Article
820-22 of the NEC that provides guidelines for proper grounding and, in particular, specifies that the cable ground
shall be connected to the grounding system of the building, as close to the point of cable entry as practical.
NOTA PARA EL INSTALADOR DE ANTENAS DE TELEVISION COLECTIVAS: La presente advertencia se provee
para llamar la atencion del instalador al Artfculo 820-22 de NEC (Cordigo Electrico Nacional) donde se facilitan las
directrices para la pertinente puesta a tierra y que especifica en particular que el condutor a tierra del cable debe
conectarse al sistema de conexion a tierra del edificio, lo mas proximo posible al punto de entrada del cable.
The lightning flash with arrowhead, within an equilateral
The exclamation point within an equilateral triangle is
M triangle, is intended to alert the user of the presence of
^k intended to alert the user of the presence of
uninsulated "dangerous voltage" within the product’s
^^k important operating and maintenance (servicing)
enclosure; that may be of sufficient magnitude to
instructions in the literature accompanying the
constitute a risk of electric shock to persons.
appliance.

INTRODUCTION
The AMC CVT2030 has been designed to give
superb sound quality and represents outstand¬
ing value for money.
The CVT2030 is a hybrid mosfet valve design,
capable of giving superb sound reproduction.
The components are all of the highest quality,
but there are a few simple hints to follow in
order to get the best from your new amplifier.
1) Do not stand any object or other component
on the top. Whilst the 2030 is one of the coolest
running Class A valve amps available, uninterr¬
upted air flow is most important.
2) There are two silent fans in the base under
each pair of EL34 valves. Again, the air space
under the amp must not be restricted in any
way. Never stand the unit on a carpeted surface
or anything soft, or on another component
which generates heat.
3) The amplifier will sound best when it is
"warmed up", this can take 15-20 minutes.
4) The valves should last a very long time but
can be changed easily. However, as there is
always some voltage present inside, even when
the unit is turned off, we recommend that this
is carried out by your AMC dealer, it is only a
five minute job for an engineer.
5) We recommend you retain the original carton
and packaging so that it can be repacked corr¬
ectly if it ever becomes necessary to transport
the unit or return for service.
6) After switching off, always let the amplifier
cool down before turning on again.
INSTALLATION
Your AMC amplifier is supplied set to work on
your local mains supply voltage. Check that
your local mains supply voltage agrees with the
voltage setting indicated on the back panel of
the amplifier. If not, please contact your dealer
or national distributor for details on how to
proceed further.
The cores of the mains lead are coloured in
accordance with the following code:
Blue -Neutral
Brown -Live
Note: Export units for certain markets have
moulded mains plugs fitted as standard.
As the colours in the mains lead may not corr¬
espond with the coloured markings identifying
the terminals in your plug, proceed as follows:
The wire which is coloured blue must be
connected to the terminal which is marked by
the letter N, or coloured black or blue. The wire
which is coloured brown must be connected
to the terminal which is marked by the letter L,
or coloured red or brown.
FUSES
If the mains plug is fused, fit a 3amp fuse.
Your AMC amplifier contains fuses which are
designed to protect the amplifier and prevent
the occurrence of a dangerous fault condition.
These should only be inspected and replaced
by a competent engineer using the correct
replacement types.
2

REAR PANEL CONNECTIONS/FRONT PANEL CONTROLS
REAR PANEL
1. INPUT 3. AC CONVENIENCE OUTLETS
2. LOUDSPEAKER TERMINAL 4. AC LINE CORD
FRONT PANEL
1
1. POWER SWITCH
3

REAR PANEL CONNECTIONS
A/C OUTLET
The A/C convenience outlets are fitted so that
other components can be powered when your
amplifier is switched on.
UNDER NO CIRCUMSTANCES SHOULD THE
CASE OF THE AMPLIFIER BE OPENED BY
ANYONE OTHER THAN A QUALIFIED
ENGINEER, AS DANGEROUS VOLTAGES ARE
PRESENT INSIDE. ANY UNAUTHORISED
REPAIR MAY INVALIDATE YOUR WARRANTY.
INPUTS
The inputs are via gold plated RCA type phono
connectors. The phono sockets on your AMC
amplifier are marked "L" for left and "R" for right
channels, with the left channel nearest the top
of the cabinet. Your connection leads will have
a white or black plug for left, and a red plug
for right.
LOUDSPEAKER CONNECTIONS
The loudspeaker output terminals will accept
4mm (banana) plugs, pin connectors, spade
connectors or bare wires.
The amplifier has speaker outputs that will
match 4-8 Ohm speakers. Confirm the imped¬
ance of your speakers then connect as follows:
For 8 Ohm Speakers, connect the negative
(black) speaker wire to the "common" negative
binding post.
Then connect the positive (red) cable to the 8
Ohm red binding post.
Repeat for the right speaker.
For 4 Ohm speakers, the negative (black)
connections are the same as the 8 Ohm, but
the positive or red connection must be to the
4 Ohm binding post. Your AMC amplifier is
capable of generating high peak currents, so
all connections must be checked to avoid
inadvertent short circuits, and to ensure a
good clean contact.
UNDER NO CIRCUMSTANCES SHOULD THE
OUTPUTS BE SHORTED TOGETHER.
FRONT PANEL CONTROLS
POWER SWITCH
The amplifier is turned on by depressing the
power switch. The small indicator above the
switch will glow green. Before switching on,
always set the volume control of your Pre Amp
to minimum to avoid damage to your
loudspeakers.
Note: Your AMC amplifier will play music within
a few minutes after being switched on. However
in common with other audiophile products, the
internal circuits take some time to stabilise fully,
and the best possible sound quality may not be
obtained until the amplifier has had some time
(possibly an hour or two) to warm up.
CHECK LIST
Should you have any difficulty in operating your
amplifier, switch off and check the following
before suspecting that a fault has developed:
No power and LED not illuminated
1. Check that all mains supplies, connections
and fuses are good and that the power is
switched on.
Power on and LED illuminated but no output
1. Check that the amplifier is connected to the
desired input.
2. Check that the loudspeakers are connected
correctly to the power amplifier.
Power on and LED illuminated but output
from one speaker only
1. Check that the input wiring is not faulty.
If in doubt, contact your dealer.
Loud hum heard through loudspeakers
when disc is selected
1. Check that the amplifier is correctly earthed
via the mains lead.
2. Check that other transformers in the vicinity
are not radiating into your amplifier.
4

SPECIFICATIONS
Power output into 8/4 ohms.30W
With both channels driven
Rated T.H.D. 45Hz-20KHz. 1 . 0 %
1 KHz clipping power into 8/4 ohms. 3 6 W
Input sensitivity for 1W/30W into 8 ohms.230mV/1250mV
Input impedance. 500K ohms/470pF
Frequency response:
20Hz-20KHz.+/-0.5dB
-3dB.10Hz/80KHz
Signal to noise ratio (ref. 1W/8 ohms):
"A-WTD.95dB
UN-WTD. 8 5dB
Separation 20Hz-20KHz. >65dB
Overall feedback.14dB
Dimensions (WxHxD). 430x112x288mm
Net weight. 13 « g
Shipping weight...i4«g
5

SAFETY INSTRUCTION
1. READ INSTRUCTIONS
All the safety and operating instructions should be read before the
appliance is operated.
2. RETAIN INSTRUCTIONS
The safety and operating instructions should be retained for future
reference.
3. HEED WARNINGS
All warnings on the appliance and in the operating instructions
should be adhered to.
4. FOLLOW INSTRUCTIONS
All operating and use instructions should be followed.
5. WATER AND MOISTURE
The appliance should not be used near water- for example, near a
bathtub, washbowl, kitchen sink, laundry tub, in a wet basement, or
near a swimming pool, etc.
6. CARTS AND STANDS
The appliance should be used only with a cart or stand that is
recommended by the manufacturer.
6A.
An appliance and cart combination
should be moved with care. Quick stops,
excessive force, and uneven surfaces
may cause the appliance and cart
combination to overturn.
7. WALL OR CEILING MOUNTING
This equipment is not designed for use mounted on a wall or a
ceiling.
8. VENTILATION
The appliance should be situated so that its location or position does
not interfere with its proper ventilation. For example, the appliance
should not be situated on a bed, sofa, rug, or similar surface that may
block the ventilation openings; or placed in a built-in installation,
such as bookcase or cabinet that may impede the flow of air through
the ventilation openings.
9. HEAT
The appliance should be situated away from heat sources such as
radiators, heat registers, stoves, or other appliances (including
amplifiers) that produce heat.
10. POWER SOURCES
The appliance should be connected to a power supply only of the
type described in the operating instructions or as marked on the
appliance.
11. POWER-CORD PROTECTION
Power-supply cords should be routed so that they are not likely to be
walked on or pinched by items placed upon or against them, paying
particular attention to cords at plugs, comvenience receptacles, and
the point where they exit from the appliance.
12. CLEANING
The appliance should be cleaned only as recommended by the
manufacturer.
13. NON USE PERIODS
The power cord of the appliance should be unplugged from the outlet
when left unused for a long period of time.
14. OBJECT AND LIQUID ENTRY
Care should be taken so that objects do not fall and liquids are not
spilled into the enclosure through openings.
15. SERVICING
The user should not attempt to service the appliance beyond that
described in the operating instructions. All other servicing should be
referred to qualified service personnel.
16. DAMAGE REQUIRING SERVICE
The appliance should be serviced by qualified service personnel
when:
a) The power-supply cord or the plug has been damaged; or
b) Objects have fallen, or liquid has been spilled into the appliance;
or
c) The appliance has been exposed to rain; or
d) The appliance does not appear to operate normally or exhibits a
marked change in performance; or
e) The appliance has been dropped, or the enclosure damaged.
17. POWER LINES
(APPLIES TO TUNER AND RECEIVERS ONLY)
An outdoor antenna should be located away from power lines.
18. OUTDOOR ANTENNA GROUNDING
(APPLIES TO TUNER AND RECEIVERS ONLY)
If an outside antenna is connected to the receiver, be sure the
antenna system is grounded so as to provide some protection
against voltage surges and built up static charges.
Section 810 of the National Electrical Code, ANSI/NFPANo. 70-1984,
provides information with respect to proper grounding of the mast
and supporting structure, grounding of the lead-in wire to an antenna
discharge unit, size of grounding conductors, location of
antenna-discharge unit, connection to grounding electrodes, and
requirements for the grounding electrode. See Figure.
a) Use No. 10 AWG (5.3 mm 2 ) copper, No. 8 AWG (8.4mm 2 )
aluminum, No. 17 AWG (1.0mm 2 ) copper-clad steel or bronze
wire, or larger, as a ground wire.
b) Secure antenna lead-in and ground wires to house with stand-off
insulators spaced from 4-6 feet (1.22-1.83 m) apart.
c) Mount antenna discharge unit as close as possible to where lead-in
enters house.
d) Use jumper wire not smaller than No. 6 AWG (13.3 mm 2 ) copper,
or the equivalent, when a separate antenna-grounding electrode
is used. See NEC Section 810-21 (j).
Antenna Grounding According to
the National Electrical Code
'"'National Electrical Code
Available from Library, book
stores, or National Fire Protection
Association (Batterymarch Park,
Quincy MA 02269).