Zesto Audio 2015 10 |
P a g e
Safety Tips
Fuses:
There are many safety features built into a Zesto power amp. The purpose of a fuse is to protect the amplifier,
sometimes they wear out and sometimes the fuse will blow. The mains fuse is the most likely fuse to blow .It is
located in the IEC power inlet connector. All fuse types are not created equal. For example, a Slow Blow fuse is
not the same as a Standard fuse.
Warning!
The BIA is designed for “Slow Blow” fuses. If you install a standard fuse, it is likely to blow when you
turn the amp on.
For 120 Volt mains we use a 6.3 Amp Slow blow fuse. (Not a 5 Amp Slow Blow)
For 220, 230, 240 Volt mains we use a 3.15 Amp Slow blow fuse.
Generally if a fuse blows you need to replace it with the same fuse. If it blows again contact your dealer
More Safety
Caution:
Tube electronics should not be turned ON, then OFF, then ON again quickly. This could blow a fuse.
Once the unit is ON, it is safe to wait a minute (60 seconds) before switching OFF, then another 60 seconds
before you can turn it back on. If you blow a fuse replace with the same slow blow fuse and don’t do that again.
Power amps output tubes (KT88) get very hot when operating properly; tubes can exceed 300 degrees
Fahrenheit.
Never
move an amplifier with hot tubes. Tubes are the most vulnerable when they are hot and it will break the
filament not the glass.
It’s important to provide adequate ventilation of at least 12” above the unit and on all sides.
To protect your speakers, turn the power amp OFF when changing any cables in your system.
If you break a tube, turn unit off immediately. Wait at least 1 hour for the high voltage to discharge completely to
replace it.
If you spill any liquids on the unit, turn off immediately and call the factory.
Grounding
Grounding switches apply to the XLR Balanced inputs only.
The grounding switches do not affect the RCA SE inputs.
If you have XLR inputs, start with both ground switches up.
The ground switches work independently. You can adjust them for the least amount of noise.
Example;
Right channel up, left channel down
Right channel down, left channel up
Right channel up, left channel up
Right channel down, left channel down
Tube Rolling
Important! The wrong type of the tubes can cause considerable damage
.
Your unit is designed to work safely with any KT88. It will also work with KT120’s, but with auto bias it will not provide
more power, just sound different. Class A design provides plenty of power.
Warning! 6550
tubes will
NOT
work in this unit. Because they have a lower power rating,
6550’s
will cause
DAMAGE
to
the power amp and the tubes.
Any damage caused by tube rolling is not covered by the manufacturer’s warranty
.
