Owner`s manual

2. Attach supplied power cord to rear IEC inlet of amplifier,
and plug other end into grounded A. C. power receptacle.
3. Turn on preamp and all other components; mute preamp
output.
4. Turn Reference 610T front-panel control from Off to
Operate; a two-minute mute/warm-up cycle will follow.
5. Select display function desired.
6. Unmute preamplifier output, initiate source component
signal, and adjust gain as appropriate.
Shut-Down:
1. Mute preamplifier output.
2. Turn Reference 610T front-panel control from either
Operate or Standby to Off.
3. Turn off preamplifier and then the associated input
source components.
Bias Adjustment Procedure
1. Amplifier should be turned on and operating for at least
30 minutes before adjusting bias of output tubes.
2. Select bias level function in display screen using either
front panel control or remote control. The 610T will
mute. Display will default to V1 location, showing bias
level and instructions to adjust bias to 65mA.
3. Using supplied flat-bladed tool, insert into V1 pot open-
ing on front panel and rotate until screen reads 65mA.
4. Using front-panel Bias knob or remote control, switch to
V2 location and repeat adjustment procedure.
5. Check bias level for all other output tubes (V3–V16);
each should measure in the range of 57mA to 73mA. If
a tube persistently measures outside this range, it should
be replaced.
6. Once tubes have been adjusted and checked for bias
level, return display screen to Power Scale function and
amplifier is ready to play. Note that if the bias level func-
tion is addressed while the amplifier is in Standby, it
is not possible to adjust bias; the display will simply
read “NA”.
The Reference 610T is shipped from the factory with all
tubes properly biased and ready to use. It is not necessary
to check bias each time the amplifier is turned on.
Under typical circumstances, most owners will find that
checking the bias level once a month or so will insure prop-
er operation and good service life of the output tubes.
Audio Research-supplied output tubes are warranted for
90 days, and under normal conditions should provide up
to 2000 hours of service life. This expected life will vary
depending on conditions of use–ventilation, speaker loads,
average playing level and A. C. voltage and line condition.
Complete sets of replacement tubes or individual tubes are
available from Audio Research, and are strongly recom-
mended for best sonic performance and reliability. These
tubes are burned in, measured, matched and specifically
selected for your Audio Research amplifier. Contact your
authorized dealer for suggested retail prices.
Installation of Optional Tube 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 D.C. 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.
The high-quality 12V D.C. fans are single-speed and are not
adjustable. They operate at a speed selected to provide
adequate cooling of the tubes with a minimum of air
turbulence or noise.
Servicing
Because of its careful design and exacting standards
of manufacture, your Reference 610T amplifier should
normally require only minimal service to maintain its high
level of performance.
C A U T I O N : The Reference 610T amplifier contains suffi-
cient levels of voltage and current to be lethal . Do not tam-
per with a component or part inside the unit. Even with
the power turned off, a charge remains in the energy
storage capacitors for some time. Refer any needed service
to your authorized Audio Research dealer or other
qualified technician.
Additional questions regarding the operation, maintenance
or servicing of your amplifier may be referred to the Cus-
tomer Service Department of Audio Research Corporation
at 763-577-9700 (C S T). When ordering a service manual
from Audio Research or an authorized dealer, be sure to
identify the serial number on your amplifier.
Cleaning
To maintain the new appearance of this amplifier, occasion-
ally wipe the front panel and top cover with a soft, damp
(not wet) cloth to remove dust. A mild, non-alkaline soap
solution may be used to remove fingerprints or similar
smudges. Cleaners containing abrasives should not be used
as they will damage the anodized finish of the front panel.
A small, soft paint brush is effective in removing dust from
bevels, the recessed nameplate and other features of the
front panel.
Model Reference 610T
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