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Select the Triode or Ultralinear configuration
according to the desired tonal characteristic. To
keep the circuit balanced, the switches for each
channel must be in the same position; however,
you can use different configurations on each
channel in order to bi-amp your speakers.
Triode has a softer and more refined tonality but
less power than ultralinear.
When used in mono, the current capability is
doubled, so to have higher power use the 8
Ohms connector for 4 to 8 Ohms speakers.
Since the U280 has gain control for each
channel, the unit can be used without a
preamplifier.
When used along with a preamplifier, it is
recommended that the left and right channel
gain potentiometers be fully open.
RECOMMENDATIONS
The amplifier may be operated with or without
the tube protecting cages; however, by not
leaving them installed while the amplifier is
operating, you will improve heat dissipation.
Thanks to the Active Servo Bias developed by
Margules, you can change the tubes without
making any kind of adjustment, with the peace
of mind of knowing that they will always operate
in their ideal range and in Class-A.
To change the tubes, they must be removed by
slowly pulling them upwards with gentle lateral
movements. They should not be removed
abruptly, as ceramic sockets with gold-plated
connectors could be damaged.
If you change the tubes for another brand or
allowed type, you may obtain different sound
characteristics. Nevertheless, changing the
tubes constantly is not recommended since this
may damage the sockets.
When you need to change the tubes, we
recommend you substitute them with matched
tubes (at least per channel) and all the same
brand and type.
When changing the tubes, make sure the
positioning guides are oriented correctly.
Do not substitute 12AU7 tubes with a different
type because this could increase distortion.
The useful life of tubes may last several years
under normal use conditions (two hours per
day); however, for an optimal performance of
the amplifier, we suggest changing the tubes
every two years.
Avoid using long interconnect cables (longer
than 10m), since this may induce noise into the
signal.
The quality as well as the DC offset in the AC
powerline
are
important
mechanical noise induced by the transformers.
Placing the amplifier on vibration isolation
devices (spikes) usually helps to improve the
instrumental
detail.
The
Anniversary amplifier is an equipment sensitive
to small adjustments, therefore we recommend
the use of high-quality cables as well as firm
amplifier stands.
TROUBLESHOOTING
1.
The amplifier does not turn on:
•
Verify the equipment is correctly connected
to the mains power or AC power source.
Verify that the switch on the back of the
•
amplifier is on.
Check the electrical supply input fuse
•
located at the back of the amplifier. If it is
damaged, replace it by one that meets the
correct specifications.
If the fuse blows again, directly contact our
•
technical support department.
2.
The amplifier turns on and the LED
indicators light up but it no sound is heard:
Verify that the preamplifier cables as well as
•
the speakers' cables are properly connected to
the terminals on the amplifier.
3.
One of the channels does not emit sound:
Verify that the preamplifier cables, as well
•
as
those
of
the
speakers,
connected to the terminals on the amplifier.
Verify the volume knob is properly set.
•
•
Check that the LED indicators at the base of
the output tubes are on.
If the two LED indicators of a same channel do
not light up, it is possible that the Active Servo
Bias fuse of that channel is blown.
In that case, unplug the amplifier from the AC
power supply and wait a few minutes. Check the
fuse corresponding to the channel that does not
emit sound, which is located at the back of the
amplifier (near the speakers' terminal).
to
avoid
any
TH
U-280
SC
30
are
properly
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