ALLNIC AUDIO A-2000 25th Anniversary SE Manuale d'uso - Pagina 7
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C.
SPEAKER TERMINALS
The A-2000 SE 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 chassis. 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.
D.
POWER CONNECTION
Connect the input interconnects and speaker cables before you insert the power cable into the receptacle in
the centre of the rear of the chassis. The A-2000 SE 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 SE you have purchased is set internally for either AC 110/120 volt – 60 HZ, or 220/230 volt – 50 HZ
operation. There is no way to change this to another AC setting without return of the unit to the factory for re-
wiring, at the owner's cost, including transport both directions.
INITIAL POWER-ON
Once you have your A-2000 25
preamplifier, you are ready to turn on the power for your A-2000. Before you power up the A-2000, though, be
sure you have:
•
removed ALL the cushion materials (cardboard) from inside the tube chimneys.
"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 SE by pushing in the power switch button located on the right-side panel of the A-2000 SE's
chassis (facing the front of the unit) to the "on" position. The "on" position is with the top of the button switch
depressed. Of course, the off position is the reverse. After about a thirty to forty (30 - 40) second delay (the soft
start), the A-2000 SE will be powered on. After warm-up and application of full plate voltage, not all tubes may bias
at the same rate. Allow one or two minutes for all the tubes to reach full operating specification.
OPERATION
When the power is on, the current meters on the top plate of the chassis will illuminate. From this point on,
operation is straight-forward. When you are finished listening, turn off your A-2000 SE's power first; then, turn off
your preamplifier and sources.
speakers as the amplifier's relays turn off. Though this sound is harmless to speakers, some users may prefer not
th
Anniversary SE in place and all connections have been made to your source(s) and
If the A-2000 SE is in triode mode at turn-off, it will produce a sound through the
7
(It is optional to leave the