Astin Trew AT2000 User manual

Website: www.astintrew.co.uk

AT2000
high definition integrated amplifier
Rosebank House
Shepherd's Green
Nr. Henley on Thames
Oxfordshire RG9 4QL UK
Telephone: [phone]
Facsimile : [phone]
Email: [email protected]
Astin Trew
Website: www.astintrew.co.uk

Operating information for the Astin Trew AT2000
integrated amplifier
SECTION PAGE
1. Introduction
2. Unpacking
3. AC Mains supply
4. Safe use
5. General Set up
6. Description of AT2000 amplifier and functions
7. Operation and remote control.
8. Valve and internal fuse replacement.
9. Troubleshooting
10. Specifications
11. Spares, cables for multi-room connectivity.
12. Guarantee
13. CE, RoHS and WEEE
14. Architectural / Engineering description for
specifiers.
1
2
3
3
3
4
4
14
17
18
19
20
20
21
21

1. Introduction
Congratulations on your purchase of the Astin Trew AT2000 stereo integrated
amplifier, an amplifier with musical sound qualities, multi-room and A/V features. This
amplifier has been designed and is manufactured to a very high design specification,
making it a true audiophile product. It will give you many years of listening pleasure. The
following notes explain all aspects of its functions and use, to help you get the very best
from it.
The AT2000 integrated amplifier, when used with high-quality audio source components
and loudspeakers, will offer an involving musical experience, normally only achievable
with far higher priced products.
AT2000 features include:
1. Incorporation of the patented Never Connected (NC) power supply, perhaps the
lowest noise and cleanest mains power supply available to audiophile amplifier
designers. Using the NC supplies allows the designer to use a single toroidal multi-
tapped transformer as the NC design ensures that the individual circuits in the
amplifier do not 'see' one another and effect the sound qualities.
This can be partially achieved by using separate transformers for each separate
circuit, at a much higher cost. The savings made using one power supply
transformer have been directed toward higher quality audio components in other
areas of the design, offering a higher quality sound and better value.
2. Balanced input and output circuitry, offering the best sounding solution available,
short of using specialist and expensive transformers (Bill Whitlock of Jensen
Transformers actually helped develop the circuit design for balanced audio we use).
3. The use of over rated power supplies and generous power capacitor storage for the
power amplifier MOSFET's.
2
The AT2000 amplifier has many features that offer flexibility in use, without
compromising your enjoyment of the highest quality sound. These include:
·Audiophile quality two or three room function, allowing all your master listening
room source components to be used remotely, up to 100Mtrs. distant, offering
high quality second room sound through balanced audio cables.
·Alternative two room function, allowing your master listening room source
components to be used remotely, up to 100Mtrs. distant, using low cost audio /
data cable.
·2:1 active sub-bass option.
·Pre-amplifier output, for bi-amping
·Line level output for analogue to digital conversion (ADC), recording, or monitoring.
TM

·RS232 data bus connectivity for remote control in 'smart home' installations,
compatible with Creston, AMX and other controllers.
·XLR and RCA (phono) inputs to pre-amplifier.
·Direct input to power amplifier, for integration into multi-channel A/V systems.
·InfraRed (IR) control cable input and output for remote control of source components.
3
The other components you use within the chain will also affect the fidelity of the sound.
The AT2000 integrated amplifier deserves to be used with the highest quality source
and ancillary components to give the best results, and works particularly well with
other AT range products, whilst being flexible enough to work with virtually any other
equipment you have in your audio system.
2. Unpacking
Included with your AT2000 integrated amplifier:
Mains lead(s); UK type and Europe type at 230VAC; or US type for 115VAC.
One remote control with batteries.
One Alan Key
One spare fuse, located within the fuse holder, see section 7.
Please retain all packing materials. Re-packing may be necessary to transport your
integrated amplifier in the future, without risk of damage to the equipment.
3. AC Mains supply
This amplifier is designed to work on either 220-240VAC or 110-120VAC supplies. The
amplifier is factory packed at 220-240VAC. If you live in a
This switch can be
found on the rear face of the unit, next to the mains input socket.
110-120VAC supply area,
you must change the voltage switch to 115VAC supply.
4. Safe use
The amplifier generates the some heat when switched on. Do not place on a carpet or
any material where the feet may sink into the surface, obstructing the ventilation slots on
the underside.
The amplifier should be located in a well ventilated area and kept away from sources of
heat, dust, humidity and direct sunlight.
Do not open the equipment at any time with the mains cable attached to the amplifier.
See section 7 for full details.

4
Do not attempt to change or alter any component or part of this amplifier except for
those which are user replaceable (see sections 6 and 7). Unauthorised adaptations will
void the warranty and may cause damage.
5. General Set up
After unpacking, check the mains voltage switch on the rear face is set to the correct
voltage for your country. IT IS FACTORY SET FOR 220-240VAC. Select the mains cable
supplied to suit your mains output socket type. All the mains cables supplied are fitted
with an IEC female plug that fits the IEC socket on the rear face of the amplifier.
The performance of this amplifier may be impaired if the electrical supply is in poor
condition. We recommend that you use a high-quality wall socket directly, or a multi-way
socket unit designed for audio use. You may also wish to try a combined multi-socket
and power supply conditioner unit, designed for audio, to optimise fidelity.
We recommend that you place the amplifier on a suitable rack, table or platform support,
offering maximum isolation from mechanical vibration.
We also recommend that the amplifier is turned on half an hour or more before use, as
most audio electronics sound better once they have 'warmed up' and this is the case
with the AT2000 . We do not recommend that you leave it on all the time - but it will
come to no harm if you do. From new, you'll find that the amplifier will need about 100
initial hours use to achieve its optimum high quality sound.
All the RCA (phono), XLR and other sockets are mounted on the rear panel, except for
the MP3 input socket. We recommend that you use high-quality signal cables for
optimum performance. Upgrading to an audiophile quality mains cable may also improve
the sound quality; however, the use of Never Connected power supplies does isolate
the critical amplification stages in the AT2000.
6. Description of the AT2000 amplifier and functions
The AT2000 integrated amplifier combines a high quality class 'A' biased pre-amplifier
stage, with a hybrid design MOSFET power amplifier. Never Connected power supply
to the pre-amplifier ensures a perfectly clean and isolated supply, allowing the amplifiers
electronics to operate with optimum fidelity under all working conditions. The volume is
controlled through a resistor ladder network, ensuring a high quality signal to the power
amplifier stage.
The power amplifier design employs a valve in its power supply regulation, optimally
driving a single pair of audio quality MOSFET's per channel in a circuit designed with
short PCB tracks and minimum components in the signal path. The power amplifier
supply is sourced from an overrated toroidal transformer and large (32 Joules)
capacitive storage per channel. The power amplifier design is particularly tolerant of low
or awkward loudspeaker impedances. The design will offer high quality sound through all
loudspeaker types.
TM
TM

5
Front fascia illustration Figure 1
integrated amplifierintegrated amplifier
MP
3in
MP
3in input
p. ampp. amp
input
disp.
At 2000At 2000
on off
/
on off
/mute
rem.
remote sourceremote source
Power on LED
IR control receiver
Remote source LED
Volume control Display
Power
on/off Headphone
Earphone MP3 in
Display brightness
Remote sourced
input
Power amp.
Input
Mute
Source inputs
selection

6
Rear panel showing connections illustration Figure 2
CAUTION
RISK OFELECTRIC SHOCK RISK OF ELECTRIC SHOCK
DO NOT OPENDO NOT OPEN
MODEL AT2000
POWER CONSUMPTION : <300W
SERIAL NO.:
MODEL AT2000
POWER CONSUMPTION :<300W
SERIAL NO.:
AC INAC IN
VOLTAGE
SELECTOR
VOLTAGE
SELECTOR
~230V~230V
50Hz
~115 V~115 V
60Hz
SPEAKER OUTSPEAKER OUT
RL
CD TUNER TA P E AUX 1AUX 1LINE AMP
SUB.
OUT
XLR OUTXLR OUT
LR
RS-232RS -232
OUT
IR
IN
XLR INXLR IN
LR
L
R
CAT 5CAT 5
OUT
CAT 5CAT 5
IN
PRE-AMP
OUT IN
IN
TM
FUSE: T5AL 250VAC/FUSE: T5AL 250VAC/
1. XLR balanced line
signal output
3. I.R. data
remote control
5. XLR balanced line
signal input (aux 2)
12. Pre-amp.
output
11. RCA (phono)
line level output
16. Power input
voltage select
switch
15. Loudspeaker
outputs, spade end,
banana or bare wire
2. RJ45 Balanced L/R
audio output and I.R.
data control
4. RS232 data
remote control
6. RJ45 Balanced L/R
audio input and I.R.
data control
7,8,9,10. RCA
(phono) inputs
13. RCA (phono)
power amp. Input
14. RCA (phono)
mono sub-bass
output
17. IEC power
input socket
18. Mains input fuse
and spare fuse holder

7
6.1 Stereo amplification, connections.
The AT2000 design has a high quality audiophile integrated amplifier at it heart. In
single room operation, there is a choice of XLR (balanced) and RCA (phono) source input
sockets. The circuitry running the balanced XLR inputs is driven from a Never
Connected supply, offering the highest quality sound from your source equipment.
The loudspeaker output binding posts will accept bare cable, banana plug or spade end
terminals. To bi-wire your loudspeakers, we suggest you use spade terminals or bare
wire connections on the binding posts.
Loudspeaker outputs for stereo configuration illustration
Figure 3
CAUTION
RISK OF ELECTRIC SHOCKRISK OF ELECTRIC SHOCK
DO NOT OPENDO NOT OPEN
MODEL AT2000
POWER CONSUMPTION : <300W
SERIAL NO.:
MODEL AT2000
POWER CONSUMPTION :<300W
SERIAL NO.:
AC INAC IN
VOLTAGE
SELECTOR
VOLTAGE
SELECTOR
~230V~230V
50Hz
~115 V~115 V
60Hz
SPEAKER OUTSPEAKER OUT
R L
CD TUNER TA P E AUX 1AUX 1LINE AMP
SUB.
OUT
XLR OUTXLR OUT
LR
RS - 232RS -232
OUT
IR
IN
XLR INXLR IN
LR
L
R
CAT 5CAT 5
OUT
CAT 5CAT 5
IN
PRE-AMP
OUT ININ
TM
FUSE: T5AL 250VAC/FUSE: T5AL 250VAC/
RIGHT
LOUDSPEAKER
LEFT
LOUDSPEAKER
TM

8
6.2 Active sub-bass output, 2.1 operation.
The AT2000 2.1 option allows you to use smaller stand or bookshelf speakers with an
additional active bass unit, from a single RCA (phono) output socket. The stereo signals
are combined and buffered, again powered from the Never Connected supply, offering
the best low frequency audio source.
2.1 audio is useful if you wish to combine your audio with your TV set up. In this
configuration, small (high quality) bookshelf or stand mount speakers are placed either
side of the TV screen and a floor standing active sub-bass is used to 'fill in' the lower
frequencies and can be placed in a discrete position in the room.
Stereo speaker configuration with sub-bass (2.1 operation)
illustration Figure 4
CAUTION
RISK OF ELECTRIC SHOCKRISK OF ELECTRIC SHOCK
DO NOT OPENDO NOT OPEN
MODEL AT2000
POWER CONSUMPTION : <300W
SERIAL NO.:
MODEL AT2000
POWER CONSUMPTION :<300W
SERIAL NO.:
AC INAC IN
VOLTAGE
SELECTOR
VOLTAGE
SELECTOR
~230V~230V
50Hz
~115 V~115 V
60Hz
SPEAKER OUTSPEAKER OUT
R L
CD TUNER TA P E AUX 1AUX 1LINE AMP
SUB.
OUT
XLR OUTXLR OUT
LR
RS - 232RS -232
OUT
IR
IN
XLR INXLR IN
LR
L
R
CAT 5CAT 5
OUT
CAT 5CAT 5
IN
PRE-AMP
OUT ININ
TM
FUSE: T5AL 250VAC/FUSE: T5AL 250VAC/
RIGHT
LOUDSPEAKER
LEFT
LOUDSPEAKER
Active sub-bass
TM

9
6.3 Second / third room operation.
The AT2000 design allows you to operate your high quality main room source
equipment in a second room - through a second AT2000 amplifier, up to 100 meters
(300 feet) away. Our design approach ensures the highest quality sound and
operational flexibility in your second room.
Indeed, it is possible to supply music from your main listening room to two additional
rooms, if so required, without any additional control components, just additional AT2000
and cables.
It is also possible to play from additional sources locally in the second/third rooms, such
as an iPod, CD or record player, independently from the first room sources, if so desired.
Control signals between the master room and second room amplifiers use InfraRed (IR)
code, sent through a data cable connection between the master room and room
AT2000's to operate the source components.
remote
All source components can be operated remotely in this way. It should be noted that
second room sources, such as CD players, tuners, and internet or satellite audio
streaming devices will need to be fitted with IR control electronics to enable functionality
in the second room.
Astin Trew source components, along with most other manufactures products do work
from a remote IR controller. Some source equipment, such as record decks, do not
(normally) have this functionality. They can however still be selected and played through
to the second room system.
When using an AT2000 in a second (or third) room, the 'rem' button on the front fascia,
or 'R/S' button on the remote control should be activated. When activated, an orange
LED illuminates to show this function. The AT2000 in the master room is then
connected and controlled through the IR data cable from the second room remote
controller.
By using an IR link cable from the AT2000 to a suitable CD player, like the AT3000 or
AT3500 in the main room, it can be controlled in the second room, by the hand held
remote controller, offering track selection, play/pause and all other CD functions
available.

10
CAUTION
RISK OF ELECTRIC SHOCKRISK OF ELECTRIC SHOCK
DO NOT OPENDO NOT OPEN
MODEL AT2000
POWER CONSUMPTION : <300W
SERIAL NO.:
MODEL AT2000
POWER CONSUMPTION :<300W
SERIAL NO.:
AC INAC IN
VOLTAGE
SELECTOR
VOLTAGE
SELECTOR
~230V~230V
50Hz
~115 V~115 V
60Hz
SPEAKER OUTSPEAKER OUT
R L
CD TUNER TA P E AUX 1AUX 1LINE AMP
SUB.
OUT
XLR OUTXLR OUT
LR
RS - 232RS -232
OUT
IR
IN
XLR INXLR IN
LR
L
R
CAT 5CAT 5
OUT
CAT 5CAT 5
IN
PRE-AMP
OUT ININ
TM
FUSE: T5AL 250VAC/FUSE: T5AL 250VAC/
MASTER ROOM AT2000 AND SOURCE COMPONENTS
(CD PLAYER, TUNER, STREAMER, RECORD DECK ETC)
Highest quality second room audio.
For very high 'audiophile' quality second room audio, professional audio quality balanced
XLR terminated cables are recommended, up to 100 Mtrs. in length. A data cable for IR
control of the source components in the master room is also required. The audio
circuitry running the balanced audio signals is driven from a Never Connected power
supply, offering the highest quality sound from your source equipment.
Note: Balanced pre-terminated XLR cables are available from Astin Trew. See our web
site or price list. Your dealer will discuss these options with you
when you purchase your second room amplifier.
www.astintrew.co.uk
Second room, highest quality audio illustration Figure 5
CAUTION
RISK OF ELECTRIC SHOCKRISK OF ELECTRIC SHOCK
DO NOT OPENDO NOT OPEN
MODEL AT2000
POWER CONSUMPTION : <300W
SERIAL NO.:
MODEL AT2000
POWER CONSUMPTION :<300W
SERIAL NO.:
AC INAC IN
VOLTAGE
SELECTOR
VOLTAGE
SELECTOR
~230V~230V
50Hz
~115 V~115 V
60Hz
SPEAKER OUTSPEAKER OUT
R L
CD TUNER TA P E AUX 1AUX 1LINE AMP
SUB.
OUT
XLR OUTXLR OUT
LR
RS - 232RS -232
OUT
IR
IN
XLR INXLR IN
LR
L
R
CAT 5CAT 5
OUT
CAT 5CAT 5
IN
PRE-AMP
OUT ININ
TM
FUSE: T5AL 250VAC/FUSE: T5AL 250VAC/
SECOND ROOM WITH ADDITIONAL AT2000 AND LOUDSPEAKERS
TM

11
Audio through 'data' cable to second or third room.
This is a cost effective alternative to the highest audio quality option. An ideal solution if
you require second or third room audio using smaller bookshelf or wall mounted
speakers for high quality, but occasional or less critical listening.
Good quality (CAT5 type, RJ45 terminated) data cable with very low or no skew
characteristics, designed for professional A/V use is recommended, to maintain high
audio quality signals. The cable has a small diameter (4-5mm typically) and is flexible
enough to be routed inconspicuously through the home. The audio circuitry running
balanced audio through the CAT5 type cable is identical to that used for the 'audiophile'
option, and is also driven from Never Connected supplies, offering a very high quality
sound from your source equipment, up to 100 Mtrs. distant.
Our experience suggests that the CAT5 A/V cable option is very good; but not as good
as using professional balanced signal cable through the XLR connector option. We
supply both cable types, to length and terminated. See web site and
price list for further details.
www.astintrew.co.uk
Second room, RJ45 audio link illustration Figure 6
CAUTION
RISK OF ELECTRIC SHOCKRISK OF ELECTRIC SHOCK
DO NOT OPENDO NOT OPEN
MODEL AT2000
POWER CONSUMPTION : <300W
SERIAL NO.:
MODEL AT2000
POWER CONSUMPTION :<300W
SERIAL NO.:
AC INAC IN
VOLTAGE
SELECTOR
VOLTAGE
SELECTOR
~230V~230V
50Hz
~115 V~115 V
60Hz
SPEAKER OUTSPEAKER OUT
R L
CD TUNER TA P E AUX 1AUX 1LINE AMP
SUB.
OUT
XLR OUTXLR OUT
LR
RS - 232RS -232
OUT
IR
IN
XLR INXLR IN
LR
L
R
CAT 5CAT 5
OUT
CAT 5CAT 5
IN
PRE-AMP
OUT ININ
TM
FUSE: T5AL 250VAC/FUSE: T5AL 250VAC/
MASTER ROOM AT2000 AND SOURCE COMPONENTS
(CD PLAYER, TUNER, STREAMER, RECORD DECK ETC)
CAUTION
RISK OF ELECTRIC SHOCKRISK OF ELECTRIC SHOCK
DO NOT OPENDO NOT OPEN
MODEL AT2000
POWER CONSUMPTION : <300W
SERIAL NO.:
MODEL AT2000
POWER CONSUMPTION :<300W
SERIAL NO.:
AC INAC IN
VOLTAGE
SELECTOR
VOLTAGE
SELECTOR
~230V~230V
50Hz
~115 V~115 V
60Hz
SPEAKER OUTSPEAKER OUT
R L
CD TUNER TA P E AUX 1AUX 1LINE AMP
SUB.
OUT
XLR OUTXLR OUT
LR
RS - 232RS -232
OUT
IR
IN
XLR INXLR IN
LR
L
R
CAT 5CAT 5
OUT
CAT 5CAT 5
IN
PRE-AMP
OUT ININ
TM
FUSE: T5AL 250VAC/FUSE: T5AL 250VAC/
SECOND ROOM WITH ADDITIONAL AT2000 AND LOUDSPEAKERS
TM

12
AC INAC IN
VOLTAGE
SELECTOR
VOLTAGE
SELECTOR
~230V~230V
50Hz
~115 V~115 V
60Hz
FUSE: T5AL 250VAC/FUSE: T5AL 250VAC/
CAUTION
RISK OF ELECTRIC SHOCKRISK OF ELECTRIC SHOCK
DO NOT OPENDO NOT OPEN
MODEL AT2000
POWER CONSUMPTION : <300W
SERIAL NO.:
MODEL AT2000
POWER CONSUMPTION :<300W
SERIAL NO.:
AC INAC IN
VOLTAGE
SELECTOR
VOLTAGE
SELECTOR
~230V~230V
50Hz
~115 V~115 V
60Hz
SPEAKER OUTSPEAKER OUT
R L
CD TUNER TA P E AUX 1AUX 1LINE AMP
SUB.
OUT
XLR OUTXLR OUT
LR
RS - 232RS -232
OUT
IR
IN
XLR INXLR IN
LR
L
R
CAT 5CAT 5
OUT
CAT 5CAT 5
IN
PRE-AMP
OUT ININ
TM
FUSE: T5AL 250VAC/FUSE: T5AL 250VAC/
Multi-room connections.
By connecting the AT2000 amplifier through a multi-room distribution system, either
controlled by an IR link or RS232 data bus, the AT2000 can become part of a smart
home integrated A/V system.
6.4 Pre-amplifier output, for bi-amping.
Bi-amping of loudspeakers is known to offer increased fidelity, normally perceived as
deeper and more articulate bass, better sound staging and generally a cleaner and
more dynamic sound. Bi-amping also increases the total power available to the
loudspeakers. To bi-amp, you will need an additional power amplifier of the same quality
and power output as the AT2000. The AT5000 power amplifier is ideal, having identical
sound characteristics to the AT2000. If you are unsure whether your loudspeakers can
be bi-amped, check this with your dealer or the loudspeaker manufacturer.
Pre-amplifier output for bi-amping illustration Figure 7
RIGHT
LOUDSPEAKER
LEFT
LOUDSPEAKER
POWER AMPLIFIER
Signal input
Right output to speaker Left output to speaker

13
6.5 Line level output for recording, or monitoring.
The line level RCA (phono) output allows you to connect the amplifier to a tape recorder
and/or monitor connection, or analogue to digital converter.
6.6 XLR and RCA (phono) inputs to pre-amplifier.
The AT2000 has 1 pair of XLR balanced, one pair of RJ45 4 pairs of RCA (phono)
signal input sockets, allowing up to 6 source components to be connected at the rear of
the unit. There is also a 3.5mm jack socket on the front fascia, for an iPod or other
MP3 device input. These are selected from the input source selection switches on the
front fascia or from the remote control 'Input' button supplied. The XLR balanced input
circuitry design is powered from the Never Connected supply and offers extremely
good noise rejection over very long cable lengths.
and
6.7 XLR output
Used for the highest quality second room audio signal option. From the master room
amplifier; to the XLR input on the AT2000 in the second room.
6.8 Input direct to power amplifier.
RCA (phono) input, direct to power amplifier. This feature allows any source audio device
with its own volume controlled output to be used directly with the power amplifier stage
in the AT2000. Example: Ideal for integration into multi-channel A/V systems, offering
two power amplifier channels for the front stereo pair. Can be switched on or off from
front fascia button or remote control.
6.9 Infra Red control cables for remote control of source components.
InfraRed (IR) modulated commands can be received and transmitted to and from the
AT2000, allowing source components to be controlled remotely, through cables rather
than being operated with the IR hand controller. The IR input and output sockets are
situated on the rear panel.
6.10 RS 232 bus control.
The AT2000 can be operated remotely through a 9 pin RS 232 bus connection,
compatible with Crestron/AMX controllers. Further technical data can be found in the
technical datasheet AT2000 downloadable from the Astin Trew web site,
www.astintrew.co.uk.
6.11 Headphone and ear bud sockets.
The AT2000 offers a choice of socket outputs, for headphones or ear buds (earphones),
with 6.4mm and 3.5mm stereo jack sockets, situated on the front fascia.
TM

14
7 Operation and remote control.
7.1 Front fascia controls.
Refer to: front fascia illustration, figure 1
Power on-off switch Illuminates a blue LED when on. When switched on, the output is
automatically muted, preventing loudspeaker 'thumps' whilst powering up. During this
period, the 'power on' LED flashes on and off.
Headphone and earphone output jacks. Other outputs are muted when jacks are inserted.
Rotary volume control is used in conjunction with the display in the window to the
right of the control to display the volume setting. When switched off, the volume level
setting at that time will be returned to when switched on again.
Display brightness (disp.) Offers two brightness levels and display off. Some people
believe that the best audio performance is had when displays are switched off. Because
we use the Never Connected supplies, we do not hear any difference, but the option is
offered.
Remote sourced inputs (rem.) is switched on second room amplifier when operating
the master room amplifier.
Power amplifier input (p.amp input) switches off signals from the pre-amplifier and
connects the power amplifier stage to 'amp in' input RCA connectors (see figure 2, item
no.13).
Mute will mute output. Display will show 'mute' when switched on.
Source input selection (input) offers 7 line level inputs (RCA unless stated), selected by
pressing the 'input' buttons on the fascia or the 'PRE-AMP INPUT' button on the remote
control. The display above the input select buttons indicates the selected input in use.
CD
Note: When 'second room' mode is selected (rem), the source inputs selection (on the
fascia) does not function, as the unit is connected to and controlling the master room
AT2000 amplifier from the second room remote control through the data control cable.
7.2 AT2000 Remote controller
Batteries (2 x AAA) are supplied. Fit into hand controller by referring to the line drawing
in the battery compartment.
Input selection, along with all other control functions, except mains power on/off, can be
made through the hand held remote control unit supplied with the AT2000.
As well as controlling the AT2000, the RC2 hand controller supplied with the AT2000
will also control Astin Trew AT3000 and AT3500 CD players.
TUNER TAPE AUX 1 AUX 2 (XLR) RJ45 MP3 (3.5 stereo jack)
TM

15
AT2000 Remote controller, in AT2000 amplifier mode
illustrationFigure 8
OPEN/
CLOSE
OPEN/
CLOSE
1 2 3
456
7 8 9
0REP
MUTE
PROG
DISPLAY VOLUME
A-BA-B
R/S
INPUT
CD
AMP
SCAN
AMP INPUT
24bit /
96KHz
24bit /
96KHz
RC-2RC - 2
7. Display
brightness/off
8. Remote source
1. Amplifier mode,
button in raised
position
2. Input selection button
3. Power amplifier
input mode
4. Output mute
5. Volume up
6. Volume down

16
AT2000 Remote controller, in AT3000/3500 CD player
mode illustration Figure 9
OPEN/
CLOSE
OPEN/
CLOSE
1 2 3
456
7 8 9
0REP
MUTE
PROG
DISPLAY VOLUME
A-BA-B
R/S
INPUT
CD
AMP
SCAN
AMP INPUT
24bit /
96KHz
24bit /
96KHz
RC-2RC - 2
19. Upsampling
on/off
18. Next track, previous
track keys
17. Fast forward, fast
backward keys
16. Play/pause
15. Stop
14. CD Draw
open/close
1. CD mode,
button depressed
9. Scan
10. Numeric track
selection1-0
11. Selected repeat
12. Repeated play
13. Track programme
selection
4. Output mute
7. Display
brightness/off

17
Numbers in brackets refer to those numbers on the illustrations in figure 8 and 9. Refer
to these illustrations when reading the following descriptions.
(1) CD or amplifier mode. When button is raised, it operates in amplifier mode ( figure 8)
and when depressed, operates CD players (figure 9), Some functions work in both
modes.
(2) Input selection. Press to select next input, Input selection is shown on the fascia
display.
CD TUNER TAPE AUX 1 AUX 2 (XLR) RJ45 MP3 (3.5 stereo jack)
(3) AMP INPUT switches off signals from the pre-amplifier and connects the power
amplifier stage to 'amp in' input RCA connectors (see figure 2, item no.13).
(4) Volume mute. Mutes the output.
(5,6) Volume up and down.
(7) Display. Brightness of display, two levels and off.
(8) R/S. Remote switching of second room amplifier.
Figure 9 shows functions to operate CD players. These are described in detail in the
Operations Manuals supplied with the Astin Trew CD player.
8. Valve and internal fuse replacement.
Replacing or substituting the valves, or replacing the internal fuses, in the unlikely event
of failure, can be carried out by your dealer or distributor. If you attempt to replace
either component, the following instructions must be adhered to.
Note: dangerously high voltages are present inside the unit, when
powered from the mains supply, that can kill.
NEVER open the amplifier when attached to the mains supply.
A. Disconnect the amplifier from all equipment and the mains supply. Place on a table
or workbench with plenty of space around the amplifier.
Caution: Wait 1 hour before opening cover to allow the valves to cool and the
capacitors to discharge.
B. Undo the10 x Alan screws in top plate with key provided. Put the screws somewhere
safe.
C. Remove the top plate, place face up, in a safe place. You are now ready to replace
the valves or the fuses.

18
Valve replacement. We recommend the valves are replaced every 20,000 hours. This is
conservative and perhaps represents a two thirds the life expectancy for these valves in
this design.
This amplifier is designed to use the ECC82 (12AU7) valve only. This common valve type
will not go out of production in the foreseeable future. There are a number of
manufacturers offering this valve. Spare Astin Trew valves can be purchased through
your dealer or distributor.
As a guide, using this amplifier four times a week for an average four hours a session, for
48 weeks a year, we would recommend you change the valves every 20 years. If you
leave your equipment switched on all the time, then we would recommend changing
them every 30 months (two and a half years).
Changing valve: Valves run HOT when in use, but will not burn you. Wait an hour after
switching off the amplifier before changing the valves so they are cold.
The valve holders are attached to the printed circuit board, and the spring terminals that
hold the valve pins are strong, so care has to be taken not to damage the board or valve
when removing or replacing them.
Do not pull all push the valve straight into / out of the holder. This could bend the circuit
board and may result in damage. The correct way to remove / insert a valve is to pull /
push gently, whilst rocking slightly in a circular way (do not twist).
When inserting a valve, first ensure the pins are not bent on the valves. Locate the pins
onto the valve holder correctly by aligning the 'spacing position' on both valve and holder.
Changing the internal fuses: The fuse holders and fuses are located on the circuit board.
Only replace it with 20mm glass fuses, as indicated on the printed circuit board. The
correctly rated fuses should be purchased through your Hi Fi dealer.
When finished, ensure no items such as tools or other parts are left in the amplifier,
replace the top plate, noting the front and back screw positions are different, re-fit all 10
Alan screws. Take care not to over tighten and damage the screw head or key.
9. Troubleshooting
If the amplifier fails to work or you suspect it's not working properly, first check all
connections to and from the amplifier. Check all the simple and obvious things first:
power supply is on at wall, sourced components are switched on and working,
Interconnect and loudspeaker cables are fitted and secured both ends.
Below are some common problems, with suggestions for the possible cure. The list is
not exhaustive. If you cannot resolve the problem yourself, please consult your appointed
Astin Trew dealer or distributor.