ekco EV55SE Manual do utilizador - Página 4

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INSTALLATION

Place the unit on a stable rigid surface with at least 1m (3ft.) of free space above it. If you are
using a turntable, ensure that the tonearm/preamplifier combination is least 400 mm away
from the amplifier to minimise any hum conduction and ideally on a separate shelf. If you
have to use the turntable and the amplifier on the same surface, place the turntable to the
right of the amplifier to maximise the distance between the tonearm and the amplifier.
Do not use this amplifier in a confined space or an enclosed cabinet!
Avoid placing the amplifier in front of the loudspeakers to avoid vibrations from the speaker
drive units causing microphonics in the amplifier and degrading the sound.
If this is your first valve amplifier: please familiarise yourself with some important issues
surrounding the safe use of your amplifier.
Valves Get Hot
Valve power amplifiers generate a lot of heat even with no input so it is vital to ensure
adequate ventilation for your amplifier.
Although the protective cages over the valves get hot they are very unlikely to cause a burn.
For absolute safety the unit should be placed out of the reach of children and pets and away
from heat-sensitive objects.
Valve Amplifiers Work at High Voltages
Valves require a high voltage to function. Do not open the case. Also ensure that nothing is
poked, dropped or poured into the amplifier's case.
The environment should be dry and free from litter. Do not place magnetically or thermally
sensitive objects (i.e. credit cards or optical discs) close to the unit.
Valves are Microphonic
Because valves are constructed from fine wires and tiny metal parts they can pick up
external vibrations. If you place the power amplifier too close to the speakers, direct
sound at high volumes may vibrate the valves. 1 metre (3ft) to the side of each speaker
should be considered a sensible minimum.
Interconnects and Cables
The signal inputs to the amplifier are via RCA phono connectors. As valve equipment works
at high impedances, the phono interconnects from source unit should be well screened
and of a low-noise, low-capacitance construction. To minimise capacitance and other
effects, signal interconnects should be kept as short as possible.
Choose good quality loudspeaker cable designed for the purpose rather than general
purpose 'zip' or 'bell' wire. The cable should be of adequate gauge to maximise bass
performance. We do not recommend high inductance or capacitance cables as these can
degrade the sound when using a valve amplifier output stages.
Mains Earthing (Grounding)
This amplifier requires connection to an earthed (grounded) mains supply. In your sound
system, the amplifier should be the only device connected to mains ground to negate hum
induced by ground loops. For this reason we suggest that you avoid using interconnects
with separate ground wires. If any of your other equipment is grounded a "hum loop" may
arise. If this happens please consult your dealer for advice.
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