Audio Note I Zero Owner's Information Manual page 9

Once all the connections are completed and checked, ensure that the volume control
is at the minimum setting (rotated all the way left).
Ensure that all source components connected to the I Zero are switched ON.
Source components should always be the FIRST components to be switched on and
the LAST components to be switched off.
The I Zero should be the LAST component to be switched on and the FIRST
component to be switched off.
The above procedure minimizes the possibility of loud noises produced by
components at switch on being passed to the loudspeakers and possibly causing
damage.
Turn on the I Zero by using the rocker switch located on the rear panel, above the
mains inlet IEC socket. The I Zero requires approximately 45 seconds to initialize
before it is ready for operation.
Input Selector
Volume Control
Bedding in
Cleaning
Valve Life
OPERATION
Turn the selector to the source you wish to listen to.
This control adjusts the listening level, or loudness. Set as
desired!
The new amplifier requires about 100 hours of initial use (called
"bedding in") before the circuitry becomes stable and optimum
performance is realized.
As the amplifier "beds in" the sound will become increasingly
smoother, more detailed and open.
Once the amplifier has "bedded in" a warm up time of
approximately 30 minutes is required each time the unit is
switched on before optimum sonic performance is reached.
No special maintenance is required for the preamplifier. Use a
soft, clean lint free cloth to remove any surface marks from the
casework. For finger marks / grease, use a soft, clean lint free
cloth, lightly moistened with a solution of warm water and mild
detergent. Do not use any alcohol or solvent based cleaning
products, as they may damage the finish of the amplifier.
ENSURE THAT THE PREAMPLIFIER IS SWITCHED OFF
AND DISCONNECTED FROM THE MAINS ELECTRICITY
SUPPLY BEFORE UNDERTAKING ANY CLEANING.
The valves supplied with your I Zero should provide
approximately 6000 hours of operation, although this is
dependent on the type of usage. They are specially selected
by us, and should only be replaced with valves of the same
type and specification. Please consult your Audio Note (UK)
dealer should your valves need replacing. Alternatively, feel
free to contact us directly.