ALLNIC AUDIO A-2000 MK3 Manuale d'uso - Pagina 7

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SPEAKER TERMINALS

The A-2000 MK3 is equipped with two pairs of high-quality speaker terminals, one for each channel. These terminals

are located to the left of the IEC input (facing the rear of the amplifier) on the rear panel of the A-2000 MK3 chassis

(See Figure 4). The right channel terminals are closest to the chassis' outside edge. For each pair, the terminal for

the live connection is marked positive (+) and is the top terminal; the lower terminal is the return connection and is

labeled negative (-). Between the two pairs of channel terminals is a switch that provides for either 8 or 4 ohm

impedance, as your speakers may require. The upper position of the switch is for 8 ohm operation; the lower for 4

ohm operation. 8 and 16 ohm terminals are available by special order. The terminals accept bare wire (not

recommended), spade and banana type connectors.

POWER CONNECTION

Connect the input interconnects and speaker cables before you insert the power cable into the receptacle in

the center of the rear of the chassis (See Figure 4). The A-2000 MK3 uses a standard three prong male IEC

connection for AC input. You need to use a power cord with a female three prong IEC connector at one end.

The A-2000 MK3 will be set internally for your location's electrical system characteristics. Please check the setting

for electrical input on the label on the rear of the unit to confirm that your A-2000 MK3 matches your location's

electrical system. For North American customers, the A-2000 MK3 is set internally for AC 110/120 volt – 50/60 Hz.

For customers in other regions, the unit is set for 230/240V – 50/60 Hz operation. There is no way to change to

another AC setting.

INITIAL POWER-ON

Once you have your A-2000 MK3 in place and all connections have been made to your source(s) and preamplifier,

you are ready to turn on the power for your A-2000 MK3. Before you power up the A-2000 MK3, though, be sure

you have:

•

removed ALL the cushion materials (cardboard/styrofoam) from inside the tube chimneys.

leave the "O" rings, if any, on the small tubes; some prefer the sound with the O rings on.)

•

selected the input connection that you want to use, single ended (RCA) or balanced (XLR), on the switch on the

back of the chassis and have the interconnect firmly attached.

•

turned on your source(s) and your preamplifier, and turned the preamplifier's volume control down to zero or

otherwise muted its output

•

securely and correctly fastened the speaker cables and ensured that they are also connected properly to the

speakers

•

checked that all tubes are snug in their sockets

Turn on the A-2000 MK3 by pushing in the power switch button located on the right of the front panel of the A-

2000 MK3's chassis to the "on" position (See Figure 5). After a brief delay (the initial soft start), the A-2000 MK3 will

approach the operation bias setting for the KT170s. After application of full plate voltage, not all tubes may bias at

the same rate. Allow some minutes for all the tubes' bias readings to settle. This can vary from about five to ten

minutes. Please be patient. See the "Current Meters" and "Tubes and Tube Bias" sections below for bias setting

details.

(It is optional to