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Ventilation Requirements
A minimum of 12 inches (30cm) clearance
is required above the top of the amplifier.
If the unit is operated in an enclosure or
equipment rack, keep in mind the above
ventilation requirements to make certain
that adequate airflow above, to each side
and to the rear is provided.
The ambient operating temperature
should never exceed 86ºF (30ºC).
Improper installation will cause premature
component and /or tube failure and will
affect your warranty as well as the service
life of the unit. If you have any questions
about correct installation, please consult
with your authorized Audio Research
dealer or contact the factory at service@
audioresearch.com.
In Your System
To ensure normal component life and
safe operation, this unit should only be
operated in an upright position. The
special non-marring elastomer feet
provide adequate spacing and stability
only on a smooth, hard surface, and must
be on a dedicated shelf or amp stand
capable of supporting 170 lbs. Check with
the manufacturer of your support system
to be sure it is rated to handle this weight.
The Reference 750 SEL power
transformer generates a magnetic field
that could, in some installations, induce
hum in sensitive electronics such as
turntables, phono cartridges and phono
stage preamplifiers. For this reason, we
recommend that any such products and
their interconnecting cables be kept a
minimum of 12" away from the Reference
750 SEL.
Vacuum Tube Life Expectancy
The vacuum tubes in your Reference
750 SEL have been burned in, tested
and electrically matched to provide
the best performance and reliability
of your amplifier. That said, vacuum
tubes wear out with use and must be
periodically replaced. The KT150 output
tubes in the Reference 750 SEL should
have an estimated life of approximately
3000 hours, while the smaller 6H30
tubes should have a life expectancy of
approximately 4000 hours. These life
expectancies are only approximate.
Please consult with your dealer or Audio
Research customer support for more
information. Warning: Tube replacement
should be installed by skilled or service
personnel, or a qualified technician.
Installation of Optional Cover
To install the optional fan-cooled tube
cover, first align the front of the cover with
the top front edge of the amplifier, making
sure the fans are positioned at the rear.
Note that there are five holes along the
top edge of each side panel; these should
match up with corresponding holes along
the bottom side edges of the tube cover.
Before settling and aligning the tube
cover at the rear, insert the 12V DC plug
attached to the fans into the 12V socket
located at the back edge of the anodized
top plate. Then secure and align the tube
cover completely, insert supplied screws
and tighten moderately.
9
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