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.
Although we have taken all the precautions to make your
equipment completely safe and to comply with the safety
standards, we recommend to unplugging it from the wall
outlet if you are not going to use it for an extended period
of time.
Keep the equipment in a well-ventilated area and far
away from materials that can be ignited.
Do not expose to rain or direct sunlight.
Do not open. There are high voltage serviceable parts
inside.
The voltage supply should be ± 15% of the line nominal
voltage specified in the product.
To clean, use a soft lightly humid cloth.
WARNING: Never take the tubes out while the amplifier is
plugged!
It is important to substitute the tubes with the correct
numbers.
Troubleshooting
Doesn’t turn on
Look for:
- Proper connection to the wall outlet.
-The rear switch to be in on position.
-The U280 SC has a 3-minute delay pre warm up time.
Wait until the current meter display reaches 43ma.
- The circuit breaker in the rear of the amplifier is
probably activated, if you see the button ejected push it
in.
One channel doesn’t sound
Look for:
-The gain controls to be in the correct position.
-The connections to be properly set.
- A protection fuse can be blown, check
them and if is the case, replace it.
WARNING: HIGH VOLTAGE inside.
Be certain to have the amplifier unplugged from the
power line.
If the fuse blows again one tube is in short or damage,
replace it.
The amplifier does not sound properly.
Look for:
-The proper voltages supply.
-The amplifier output impedance selector to be in the
proper position.
Check for further advises in the operation section of this
manual.
