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Note
Building regulations and electrical codes differ from location
to location, making it impossible to anticipate the require-
ments of high-current AC circuits such as the Nº33H. Contact
a local, licensed electrician for information.
Warm-up & Break-in Although the Nº33H delivers superior performance from the
Period first time it is powered on, this performance will continue to
improve as various components “break in.” You should notice the
greatest performance improvements within the first 25 to 50
hours of use. The amplifier should continue to improve in sound
quality for approximately 300 hours.
After this initial period, performance will remain consistent unless
power is disconnected, allowing the amplifier to cool down.
(Power is considered disconnected when the Nº33H is powered off
with the rear panel ~ac mains relay switch or the power cord is
disconnected from the electrical outlet; or an extended power fail-
ure or power outage occurs. Power is not disconnected when the
Nº33H is in standby.) When power is returned, the Nº33H will
require a brief warm-up period of about 2 minutes before the
amplifier sound quality is at its best. (You will never have to
repeat the full 300 hour break-in period.)
Continuous Operation The Nº33H should be unplugged during lightning storms and
extended periods of non-use. Otherwise, it is designed for continuous
operation. For best performance, make sure the power cord is con-
nected to an electrical outlet at all times. During normal opera-
tion, do not use the rear panel ~ac mains relay switch to power
off the Nº33H. Instead, use the standby button to place the
Nº33H into standby, which allows the power amplifier to remain
warmed-up to deliver optimal performance at all times.