Audio Note M8 Line Signature Owner's Information page 17

Bedding in
Cleaning
Valve Life
OPERATION continued...
The new preamplifier requires around 200 hours of initial use
(called "bedding in") before the circuitry becomes stable and
optimum performance is realized.
As the preamplifier "beds in" the sound will become
increasingly smoother, detailed and more open.
Once the amplifier has "bedded in" a warm up time of
approximately 20 to 30 minutes is required each time the
amplifier 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 M8 Line Signature preamplifier
should provide approximately 3 years of operation. 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.