Margules U280sc 25th, Руководство пользователя

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the load requirement. BEFS permits the amplifier to drive difficult
speaker loads with exceptional efficiency, dynamics and extended
controlled bass.
The U280-SC's innovative design is complemented with a fine new
finish, new silver coated epoxy pc boards, military grade
potentiometers, precision metal-film resistors and audio grade
interstage capacitors.
SETUP
The amplifier should be unplugged from the wall outlet.
Choose the proper output impedance accordingly to your speaker;
both channels should be the same.
2 ohms from 1 to 2 ohms load
4 ohms from 4 to 8 ohms load
8 ohms from 8 up ohms load
In Mono mode always use both channels of the amplifiers in
ultralinear or triode mode in the same output impedance range.
The recommended settings are the following:
2 Ohms should
4 Ohms from 2 to 4 ohms load
8 Ohms from 4 to up ohms load
If used as Stereo or Mono the Triode/Ultralinear mode should be the
same in both channels.
Connect the speakers to the output binding posts, red to red black to
black the input signal of the amplifier to the preamplifier.
If you are not using a preamplifier set the level controls to minimum
otherwise full clockwise.
Check the power switch in the back of the amp to be off.
Connect the amplifier to the AC outlet of the wall, check
that all connections are OK and flip the switch to on.
Wait until the meter reads 43 ma
The panel meter is the actual current passing through
the right front output tube. When overpasses the 100ma,
you are overdriving the tubes; around 120ma, coincides
with the maximum power.
It is not important if you overdrive the tube in short
periods, if you do it continuously, it will shorten the life
expectancy of the tubes. To change the tubes just
unplug the A.C. power line cord, pull out the old ones,
and insert the new tubes; the active bias will balance
them.
We recommend matched pair output tubes, but this is
not indispensable.
Do not substitute with other type the two 12AU7 tubes in
the back of the amplifier. You will unbalance the circuit
and will raise the distortion.
Break-in
The break in period is about 150 hours of music
reproduction.
Tube life expectancy
For optimal performance we recommend to change the
set off tubes every two years, although they should last
a much longer period.
Precaution and care
This product is intended to be plugged directly to the
power supply line of your house.