6. CE, RoHS and WEEE AT 8000 phono amplifier

6. CE, RoHS and WEEE AT 8000 phono amplifier
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This guarantee does not affect your consumer
rights under English law.
In the event of a failure, neither Air Audio Ltd.
t/a Astin Trew or its distributor or dealer shall
be liable for any injury, loss or damage caused
to property or products other than the product
under warranty.
If the returned equipment is found not to be faulty,
Astin Trew reserves the right to make a charge
for both the examination and return carriage.
CE, RoHS and WEEE
All Astin Trew products can be
returned after use in accordance with the
WEEE Directive, to the receiving agent. Contact your Dealer for further information.
All Astin Trew products comply
with the RoHS Directive.
All Astin Trew products comply with CE
regulations.
6.
True to the source
Telephone: +44 (0)1491 629 629
Website: http://www.astintrew.co.uk/
Astin Trew
Rosebank House, Shepherd’s Green
Nr. Henley on Thames, Oxfordshire
RG9 4QL UK
OPERATION MANUAL
phono amplifier
AT 8000
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4
Setting up
Getting started
Trouble shooting
AT8000 Specifications
Guarantee
CE, RoHS and WEEE
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PAGE
SECTION
Operating information for the Astin Trew AT8000
phono amplifier
(not user switchable).
Asymmetrical RCA (phono) sockets, Left/Right.
RIAA Accuracy:
Moving coil:
Moving Magnet:
Impedance options:
1kOhm
470Ohm
+/- 0.5 dB
20kOhm
220Ohm
100Ohm
56kohms / 300pf
56kohms / 150pf
Low (+45db), Mid (+52db), High (+60db) @ 1kHz
Gain options:
Symmetrical / balanced XLR, Left/Right.
Asymmetrical RCA (phono) sockets, Left/Right.
Signal outputs:
Signal:
Power:
220-240VAC or 110-120VAC
2.4Kg
Total boxed weight:
Inputs:
1.9Kg
Net weight:
Size: 305mm long x160mm wide x 115mm high (inc. feet)
4: AT8000 Specifications
phono amplifier), ensure that the cartridge is
not picking up hum from a transformer in your
preamplifier, power amplifier or integrated amplifier. This hum might be confused with positioning
of the phono amplifier. Check by moving the tone
arm from its rest pillar toward the centre spindle
and note if there is a slight difference in pitch or
volume of any hum. If there is, it is an indication
that a transformer / amplification electronics is
positioned too close to the cartridge.
>60 dB
from 20Hz.
Channel separation:
Low frequency roll off:
Liability for damage or loss during transit
from the retailer or purchaser back to
Astin Trew or its authorised agent for the
purposes of repair or inspection.
All damage caused by accident, misuse,
neglect, incorrect installation, adjustment,
replacement of any parts or non-authorised repair or servicing.
Carriage costs to Astin Trew or their agents
shall be borne by the consignor.
B.
A.
The two year guarantee excludes:
A two year guarantee is given and is valid from
the date purchase, against any defect in materials or workmanship. Retain your receipt as
proof of purchase. All claims should be made
through your dealer or distributor under this
guarantee.
5. Guarantee
changes without notice.
or changes which may result in specification or feature
Astin Trew reserves the right to make improvements
Mains cable; 3 x dust caps; Operation manual.
Parts supplied:
< -84 dB, shorted inputs
< -72 dB, shorted inputs.
Moving Coil
< 0.1%
Moving magnet:
Signal/Noise ratio:
Distortion:
7
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Please note:
Never cover or put anything on top of the
AT8000 preamplifier, or place the AT8000
on a deep pile rug or carpet. As with all high
quality audio equipment, it will perform best if
If you find the sound too bright or too dull it may
be that the combined signal cables and cartridge loading require a different impedance setting. Try changing the impedance setting first to
one side, then the other, of that recommended
by the cartridge manufacturer. This cannot
damage your cartridge and another setting may
offer a better balanced sound in your system.
Remember to switch off the AT8000, remove
the power cable and turn off or set the volume
control to zero on your amplification, before
changing the impedance settings.
Connect the IEC mains power supply cable to
the AT8000 and switch the unit on.
Now switch on your amplifier(s).
Connect your AT8000 phono-amplifier to
your turntable (arm/cartridge) output signal
cable and attach the earthing cable from the
turntable (if you have one) to the AT8000
earth connection (above the RCA sockets).
Now attach output cables (RCA or XLR) from
your preamplifier or integrated amplifier to the
AT8000 output sockets.
Set the gain and impedance adjustment
switches to the correct positions for your
cartridge. Please now check that all electrical
components in your audio system are switched
off. Fit the three dust caps supplied into the
holes. These can be prised off with a small
screwdriver when changing to another setting.
2. Getting started:
Note: When positioning the AT8000 (or any
Positioning the AT8000 close to any other amplifier with a big transformer might cause hum.
Check that the earth cable from the turntable
is connected to the earthing point on the
AT8000; or, if already fitted, remove the earth
cable and see if this reduces or increases hum.
It is unlikely, but the AT8000 power supply transformer could possibly induce hum
through the cartridge or cartridge cabling
if positioned too close. Carefully move the
AT8000 away from the turntable to see if this
reduces the hum.
Hum through the loudspeakers. Mains hum
can be caused by system earthing loops or
induced hum through one or more parts of the
amplification or cabling of the audio system.
No LED light when switched on. Check there is
power to the AT8000. If there is mains power
through the mains cable, the lack of LED light
will most likely be caused by the internal mains
fuse having blown. In this unlikely event, please
take to your local dealer for a replacement fuse
fitting. He will check that the fuse has not blown
due to an electrical fault in the AT8000.
No power. Ensure the power is switched on at
the mains and the switch above the IEC power
input socket on the AT8000 is also switched on.
The LED on the front fascia will illuminate when
there is power to the unit. Check the IEC cable
is live with some other electronic equipment.
3. Trouble shooting:
mounted on a vibration free surface.
The inputs are through gold plated RCA
(phono) sockets and the signal output can be
through either gold plated RCA or silver plated
XLR balanced sockets. If your integrated
The AT8000 has a power on/off switch on
the rear and the blue LED power indication
light on the front fascia. We suggest the
AT8000 only be switched off when you are
disconnecting or changing any components
in the audio chain. This assures a constant
operating temperature in the unit and the best
possible sonic results at all times.
The AT8000 has easily adjustable input load
and impedance switching, allowing you to select the best operating conditions for virtually
all moving magnet or moving coil cartridges
available today.
AT8000 design features.
The AT8000 RIAA MC/MM phono-preamplifier
has been designed for the highest quality analogue music reproduction in mind. The AT8000
uses only the best quality components in both
its power supply and thoughtfully designed dual
mono RIAA and amplification circuits. Even the
heavy gauge copper tracks on the PCB board
are gold plated for best sound quality and star
earthing is used. This phono amplifier offers a
very clear and musical presentation, this being
central to the Astin Trew philosophy, summed up
in our tag line ‘true to the source ’.
Congratulations and thank you for choosing
the Astin Trew AT8000 MM/MC phonoamplifier, a quality product made in the UK to
the highest specifications for your listening
enjoyment.
There is a mains fuse within the AT8000 casing, and the cartridge optimisation switches
accessible from the base. If you were to look
inside the case however, you would see little
more than the power supply components and
a solid faraday cage covering the ‘delicate’ amplification and RIAA stages, offering substantial
RFI/EMI protection.
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The electrical components used in the AT8000
are of high quality and have been carefully
selected for their audible qualities – very linear
low noise precision resistors and polystyrene
capacitors in critical RIAA and feedback stages;
audiophile grade polypropylene capacitors and
over rated power supplies to the signal circuits.
The circuit board uses gold plated thick copper
tracks for optimum audible quality.
There are seven cartridge load impedance
options, five for Moving Coil (MC) cartridges
and two for moving magnet (MM); plus three
gain settings, all accessible through access
ports (with dustproof covers) in the base of the
AT8000, without having to open the casework.
If the signal cable from the AT8000 to your
preamplifier or integrated amplifier is over
2.5Mtrs. long, we would recommend you use a
balanced XLR cable to keep the noise floor as
low as possible. Your Hi-Fi Dealer will be able to
suggest a suitable cable for you.
amplifier, (such as the Astin Trew AT2000)
or preamplifier has XLR balanced inputs, we
would urge you to experiment to see if you
prefer the sound of the balanced or unbalanced cable option in your system. They do
have sonic differences and one may suit over
the other in your system set up.
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= switches 1 and 4
= switches 2 and 5
= switches 3 and 6
Make sure one gain switch per channel is
always set to “on”. When all switches are in
the “off” position, the phono preamplifier will
Select the gain option according to the desired
output level: For MM cartridges: Low output
setting is normally correct; high output MC:
Medium output setting; low output MC cartridges normally require: High output setting.
Low output
Medium output
High output
Make sure that all corresponding switches are
always set in the same position:
There are three separate six way DIP switches,
two (left and right channel) for the impedance
settings; and one six way switch where switches 1,2 and 3 are used for the left channel low,
medium and high settings, with switches 4,5
and 6 used for the right channel low, medium
and high settings. The high gain setting offers
+60dB amplification.
You should use a small flat headed screwdriver
to move the switches. Take care not to push
the switch with too much force. They move
easily. If you are unsure about this operation or
correct selection, please ask your Hi-Fi dealer
to make the adjustments.
Because the RIAA and amplification stages
are dual mono (none of the I.C.’s operate 2
channels), all cartridge optimisation switching is duplicated on both left and right channels; and required to be switched identically
on both channels.
1. Setting up.
Switch 1 on
Switch 2 on
Switch 3 on
Switch 4 on
Switch 5 on
ALSO IMPORTANT.
To prevent any possibility of damage to your
loudspeakers always ensure your power amplifier is switched off or at zero volume when you
are changing signal interconnect cables to or
from the AT8000 or turning on the AT8000.
Switching whilst the unit is mains powered or connected by signal cables could result in damage to
the AT8000, or to your other equipment.
IMPORTANT.
Before removing the plastic dust caps from
the access ports in the base of the casing (for
cartridge optimisation adjustment) you must
first…disconnect the AT8000 from the power
supply cable and all signal cables.
100Ohm
220Ohm
470Ohm
1kOhm
20kOhm
Load impedance settings and switch numbers
(for left and right channel switches):
Moving coil (MC) cartridge options.
Load impedance, 56kOhm/150pf. Set all
switches to the off position.
Load impedance, 56kOhm/300pf. Switch 6
on for additional capacitive loading.
Moving magnet (MM) cartridge options.
Check your cartridge impedance requirements.
Set the left and right 6 way switching to suit:
make a buzzing noise, which isn’t fatal for the
electronics but very unpleasant to hear!
Impedance and gain settings
Rear Connections
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