Audio Note M2 Line - Manual (Page 10)

Bedding in
The new preamplifier requires about 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 open.
Once the amplifier has “bedded in” a warm up time of
approximately 30 to 45 minutes is required each time the
amplifier is switched on before optimum sonic performance is
reached.
Cleaning
No special maintenance is required for the amplifier. 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 M2 LINE IS SWITCHED OFF AND
DISCONNECTED
FROM THE MAINS ELECTRICITY
SUPPLY BEFORE UNDERTAKING ANY CLEANING.
Valve Life
The valves supplied with your M2 Line Premplifier should
provide approximately 5 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.
OPERATION continued…