AMC CVT3100MKII User guide

H.O.M.E. AUTOMATION SERIES
POWER
PHONES
CVT3100MKII
CVT3100MKII
INTEGRATED VALVE
AMPLIFIER
IA

2
The AMC CVT3100MKII has been
designed to give superb sound quality
and represents outstanding value for
money.
The CVT3100MKII is a hybrid mosfet
valve design, capable of giving superb
sound reproduction. The components
are all of the highest quality.
The AMC proprietary designed Class A
hybrid MOS-FET amplification
topologies are accomplished as
following : a. Designed with 1000V
MOS-FET using exactly the same as
Classical Valve (MOS-FET Valve based
on majority current the same as
Classical Valve ) class A amplifications
in order to create excellent dynamic
range at the same time very accurate
and reliable with long life that Classical
Valve can't not achieve. b. MOS-FET
Valve Topology will be able to be
designed to more accurate in order to
have much better sound than Classical
Valve as FET Valve has much more
consistent and accurate characteristics.
c. MOS-FET Valve can keep the same
superb sound quality throughout the
much longer life. Classical Valve will
keep changing characteristic for worse
and worse sound reproduction through
the relative short life. d. The hybrid
MOS-FET Valve use output stage with
Classical Valve in order to make the
Class A amplifier lower cost for making
AMC Class A amplifiers can be
affordable for all music lover to enjoy
instead of only for rich people. With
Classical Valve as output stage to take
high temperature without huge heatsink
in order to cost down. At the same time,
it will be ok for output stage to change
characteristics as output stage only
take care of power portion of Class A
amplifier. So, the topology can have
much lower cost and much longer life
for Classical Valve. e. So, AMC hybrid
MOS-FET valve design can achieve
superb sound quality, much longer life
time and with much lower price.
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
CVT3100MKII is one of the coolest
running Class A valve amps available,
uninterrupted air flow is most important.
2) There are two silent fans in the base
under each pair of EL34 values. 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," which can take 15 - 20
minutes. Avoid operating the
PHONES/NORMAL/DIRECT switch
during this period.
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 correctly 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.
INTRODUCTION

3
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 colored
in accordance with the following code:
Blue -Neutral
Brown -Live
Note: Export units for certain markets
have molded mains plugs fitted as
standard.
As the colors in the mains lead may not
correspond with the colored markings
identifying the terminals in your plug,
proceed as follows:
The wire which is colored blue must be
connected to the terminal which is
marked by the letter N, or colored black
or blue. The wire which is colored
brown must be connected to the
terminal which is marked by the letter
L, or colored red or brown.
If the mains plug is fused, fit a 3.15amp
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 conpetent engineer using the
correct replacement types.
FUSES
Should yo have any difficulty in operating
your amplifier, switch off and check the
following before suspecting that a fault
has developed:
1. Check that all mains supplies,
connections and fuses are good and that
the power is switched on.
1. Check that the amplifier is connected
to the desired input and that the correct
input on the amplifier is selected.
2. Check that the loudspeakers are
connected correctly to the power
amplifier.
3. Check that the Direct/Phones switch is
not set to "Phones."
4. Check that the Tape Monitor switch is
not set to "Tape."
1. Check that the left and right channels
of the selected source are connected
correctly and that the input wiring is not
faulty. If doubt, contact your dealer.
2. Check that one section of the volume
control is not set to minimum.
1. Check that the ground lead from the
turntable (if fitted) is connected firmly to
the ground terminal on the rear of the
amplifier.
2. Check that the amplifier is correctly
earthed via the mains lead.
3. Check that other transformers in the
vicinity are not radiating into your
amplifier.
No power and LED not illuminated
Power on and LED illuminated but no
output
Power on and LED illuminated but
output from one speaker only
Loud hum heard through
loudspeakers when disc is selected
INSTALLATION
CHECK LIST

H.O.M.E. AUTOMATION SERIES
POWER
PHONES
CVT3100MKII
MAINS
230V 50Hz
UNSWITCHED 1A MAX
++
8W4W
SPEAKERS
L
R
230V 50Hz 1.8A
CCVT Integrated Amplifier CVT3100MKII
L
R
PHONO CDiPod / DAC TUNER VIDEO AUX
LLL
RRR
L
R
TAPE IN PRE OUT
TAPE OUT
1.PHONO GROUND TERMINAL
2.PHONO INPUT (OPTION: COAXIAL INPUT)
3.iPod/DAC INPUT
4.CD INPUT
5.TUNER INPUT
6.VIDEO INPUT
7.AUX INPUT
8.TAPE INPUT
9.TAPE OUTPUT
10.PRE OUT
11. LOUDSPEAKER TERMINALS
12.AC RECEPTACLE
13.AC OUTLET
1.POWER SWITCH
2.PHONES
3.INFRARAD RECEIVER
4.PHONES/NORMAL/DIRECT
SWITCH
5.BALANCE
6.BASS CONTROL
7.TREBLE CONTROL
8.TAPE MONITOR SWITCH
9.INPUT SELECTION SWITCH
10.VOLUME CONTROL
4
REAR PANEL CONNECTIONS/FRONT PANEL CONTROLS
FRONT PANEL
31
1245678910
3
2
45
REAR PANEL
67 9 10 1213
118

5
A/C OUTLET
INPUTS
CD INPUT
VIDEO
AUXILIARY INPUT
TAPE INPUT
The A/C convenience outlet is fitted so
that other components can be powered
when your amplifier is switched on. You
must fit an Standard 3 pin plug, available
from most specialist dealers.
All audio Inputs and tape outputs are via
gold plated RCA type phono connectors.
All the phono sockets on your AMC
amplifier are marked "L" for left and "R"
for right channels, with the left channels
nearer the top of the cabinet. Your
connection leads will have a white or
black plug for left, and a red plug for right.
The CD input is suitable for use with any
CD player. Connect your CD player to the
amplifier using the phono sockets marked
"CD."
The video input is suitable for most VCR's
with an audio output. Connect your VCR
using the phono socket marked "Video."
The Auxiliary input is suitable for use with
any extra source processing a line level
output, perhaps a second tuner or CD
player, or an additional tape or video
recorder wired for replay only.
This input is suitable for use with most
cassette, reel to reel or video recorders.
Connect the "record" leads of your tape
recorder to the phono sockets marked
"Tape out" on the rear of your amplifier
using phono/phono leads.
Connect the "playback"leads of your tape
recorder to the phono sockets marked
"Tape in" on the rear of your amplifier
using phono/phono leads.
If your tape machine processing DIN
outputs, then DIN/phono leads, or a
DIN/phono adaptor can be used. If you
experience level matching problems
when using DIN connectors, please
consult your tape machine manufacturer.
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
UNAUTHORIZED REPAIR MAY INVALIDATE
YOUR WARRANTY.
PHONO INPUT
iPod / DAC
TUNER INPUT
PRE OUT
The input is suitable for either moving
magnet or moving coil cartridges which
can be selected by the switch on Phono
board. Moving magnet cartridge is preset
in CVT3100MKII. Please ask your dealer
to change the MM/MC switch on Phono
board to MC if you use moving coil
cartridge. The plugs on your turntable
lead should be connected to the disc
input sockets on the rear panel of your
amplifier.
The iPod/DAC input is suitable for use
with any iPod/DAC player. Connect your
iPod/DAC player using the phono socket
marked iPod/DAC.
The tuner input is suitable for use with
most AM/FM tuners. Connect your tuner
to the amplifier using the phono sockets
marked "Tuner."
These RCA jacks provide the preamplifier
outputs which are adjusted by the volume
control. Normally it is connected to the
main-in input of an external power
amplifier.

6
OPTION: COAXIAL INPUT
LOUDSPEAKER CONNECTIONS
VOLUME CONTROL
AMC 24bit/192KHz S/PDIF DAC Module,
MD1108s, can replace PHONO module to
have digital input in CVT3100mKII.
The loudspeaker output terminals will
accept 4mm(banana)plugs, spade
connectors, pin connectors or bare wires.
The amplifier has speaker outputs that
will match 4 - 8 ohm speakers. Confirm
the impedance 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.
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.
ecorder is routed to the loudspeakers/
headphones.
If your tape machine is a three head type
suitable for A/B monitoring, then turning
the Tape Monitor switch to the "Tape"
position will allow full off-tape monitoring
of the recorded signal to be carried out
via the loudspeakers/headphones.
The volume control adjusts the overall
loudness level of the sound. It has no
effect on the level of the signals fed to the
TAPE OUT jacks for tape recording. The
Volume control is designed for accurate
UNDER NO CIRCUMSTANCES SHOULD
THE OUTPUTS BE SHORTED TOGETHER.
POWER SWITCH
Note:
INPUT SELECTION
TAPE MONITOR SWITCH
The amplifier is turned on by depressing
the power switch. The small indicator
above the switch will glow blue. Before
switching on, always set the volume
control to minimum to avoid damage to
your loudspeakers.
Your AMC amplifier will play music
almost immediately after being switched
on. However, in common with other
audiophile products, the internal circuits
take some time to stablize 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.
The rotary input selector switch selects
which input signal (Phono, iPod/DAC,
CD, Tuner, Video or Aux) is fed to the
power amplifier. The selected signal is
also fed to the "Tape out" sockets for
recording.
The Tape Monitor switch is generally left
in the "Source" position, so that the
program selected by the input switch is
routed to the loudspeakers/headphones.
If the Tape Monitor switch is turned to the
"Tape" position, the signal from the tape
r
FRONT PANEL CONTROLS

tracking of its two channels, so that the
stereo balance will not shift noticeably as
the loudness of the sound is varied.
TONE CONTROLS
PHONES
TAPE RECORDING
PLAYBACK
The tone controls on your AMC amplifier
use low coloration passive circuitry to
ensure the minimum degradation of the
music signal. They are designed to
gradually modify the tonal emphasis of
the music and to compensate for such
problems as difficult room acoustics.
If required, the tone controls can be
completely by-passed with a resultant
increase in sound quality. To do this
simply turn the Direct/Mute switch to the
"Direct" position.
With the Direct/Mute switch in the
"Normal" position, the tone controls will
cut their respective frequencies when
turned anti-clockwise and boost them
when turned clockwise. The flattest
response is found when the controls are
in the "12 o'clock position. (DETENTED
POSITION)
The headphone socket will accept any
headphones fitted with a standard
1/4"(6.35mm) stereo jack plug. For
private listening via headphones, the
Direct/Phones switch should be set to
"Phones," thus cutting the output to your
loudspeakers. In this position the tone
controls remain active. The mute feature
is also useful for situations where the
output from your loudspeakers needs to
be cut momentarily (eg., for a phone call,
etc).
All sources, Phono, iPod/DAC, CD,
Tuner, Video and Aux can be recorded via
the tape connections. To record an input,
select the required source and set your
recorder to the record mode.
To record from one tape recorder to
another, the playback recorder should be
plugged into the Aux socket, and the
recording machine into the Tape socket.
The input selector switch should be set to
"Aux". A recording can now be made in
the normal way.
Set the Tape Monitor switch to the "Tape"
position and set your recorder into the
playback mode.
7

1
2
1
8
1.INPUT SELECTOR 2.VOLUME CONTROL
These buttons select any one of the Six
sources that are connected to the
inputs of the CVT3100MKII (PHONO,
iPod/DAC, CD, TUNER, VIDEO, AUX).
: VOLUME UP
: VOLUME DOWN

9
SPECIFICATIONS
Weltronics Corp. reserved the right to improve its products at any time. Specifications
are subject to change without notice.
Rated Power into 8/4 ohms........................................................................80W
With both channels driven
Rated T.H.D. 45Hz-20KHz............................
1KHz clipping power into 8/4 ohms...........................................................85W
High level inputs.........................................................................................34mV/180mV
Phono input......................................................................................0.5mV/2.7mV
High level inputs...................................................................................20K ohms/100pF
Phono input ......................................................................................47K ohms/100pF
Tone bypass 20Hz-20KHz.................................................................................+/-0.5dB
Normal 20Hz-20KHz..........................................................................................+/-1.0dB
High level inputs -3dB..................................................................................10Hz/80KHz
High level inputs "A" WTD.......................................................................................80dB
Phono inputs"A" WTD............................................................................................79dB
Separation 20Hz-20KHz ......................................................................................>50dB
Bass at 50Hz......................................................................................................+/-8dB
Treble at 10KHz................................................................................................+/-7dB
Overall feedback................................................................................................14dB
Dimensions (W x H x D)......................................................................430x112x389 mm
Net weight............................................................................................................19 Kgs
Shipping weight ..................................................................................................20 Kgs
.........................................................1.0%
Input Sensitivity for 1W/Rated Power into 8 ohms:
Input impedance:
Frequency response:
Signal to noise ratio(ref. 1W/8 ohms):
Tone control range:
PHYSICAL:

All the safety and operating instructions should be read
before the appliance is operated.
The safety and operating instructions should be retained for
future reference.
All warnings on the appliance and in the operating instructions
should be adhered to.
All operating and use instructions should be followed.
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.
The appliance should be used only with a cart or stand that is
recommended by the manufacturer.
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.
This equipment is not designed for use mounted on a wall or a
ceiling.
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.
The appliance should be situated away from heat sources
such as radiators, heat registers, stoves, or other appliances
(including amplifiers) that produce heat.
The appliance should be connected to a power supply only of
the type described in the operating instructions or as marked
on the appliance.
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,
convenience receptacles, and the point where they exit from
the appliance
The appliance should be cleaned only as recommended by
the manufacturer.
The power cord of the appliance should be unplugged from the
outlet when left unused for a long period of time.
Care should be taken so that objects do not fall and liquids are
not spilled into the enclosure through openings.
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.
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 is
damaged.
(APPLIES TO TUNERAND RECEIVERS ONLY)
An outdoor antenna should be located away from power lines.
(APPLIES TO TUNERAND 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/NFPA No.
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 ) copper, No. 8 AWG (8.4 mm )
aluminum, No. 17 AWG (1.0 mm ) 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 )
copper, or the equivalent, when a separate antenna-
grounding electrode is used. See NEC Section 810-21(j).
1. READ INSTRUCTIONS
2. RETAIN INSTRUCTIONS
3. HEED WARNINGS
4. FOLLOW INSTRUCTIONS
5. WATER AND MOISTURE
6. CARTS AND STANDS
6A.
7. WALL OR CEILING MOUNTING
8. VENTILATION
9. HEAT
10. POWER SOURCES
11. POWER-CORD PROTECTION
12. CLEANING
13. NON USE PERIODS
14. OBJECT AND LIQUID ENTRY
15. SERVICING
16. DAMAGE REQUIRING SERVICE
17. POWER LINES
18. OUTDOOR ANTENNA GROUNDING
22
2
2
SAFETY INSTRUCTION
S3125A
PORTABLE CART WARNING
Antenna Lead
In Wire
Ground
Clamp
Electric
Service
Equipment
Power Service Grounding
Electrode System
(NEC Art 250 Part H)
Ground Clamps
Antenna
Discharge
Unit (NEC
Section 810.20)
Grounding Conductors
(NEC Section 810.21)
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).
AMC 21-4153

PN: 21R-4265
21R- 4265