turers loading recommendation to begin with and then
listen to alternate loading if desired.
Because all Ref Phono 2 front panel functions are
duplicated on the remote, you may listen to loading sonic
changes from the listening position by selecting different
loads via their individual buttons on the remote. (Note that
depending on the phono cartridge the volume level may
decrease as lower loading values are selected.)
RIAA:
Selects between RIAA, early COLUMBIA stereo and
early DECCA stereo LP phono equalization curves.
Remote Control Functions
In addition to all of the front panel control functions, the
remote also accesses the following functions.
DISPLAY DOWN/DISPLAY UP [DSP DN/DSP UP]:
De-
creases/increases display intensity, offering 6 levels of
brightness and display “off”. If display “off” is selected, a
small pilot light remains illuminated in the center of the
display window as a reminder the unit is turned on. In
display “off” mode the display will illuminate for 10
seconds when any button (except Power on/off) is selected,
allowing for control function navigation.
H O U R S :
When pressed, displays number of operating
hours vacuum tubes have been in service. WARNING: after
replacing tubes, this function should be reset to “0” only by
a qualified technician. Hours display can be reset to “0” by
pressing square black button located on upper right corner
of vertical circuit board directly behind display window
inside of the chassis. The preamp must be “On” to reset
function–the service technician must be careful to avoid
any contact with other circuit components during reset
operation. Contact Audio Research customer service (763-
577-9700) for information regarding this procedure.
Connections
INPUT CONNECTORS:
There are two sets of RCA input
connectors, for connecting multiple turntable/tonearm
cables.
OUTPUT CONNECTORS:
There is one set of BAL and
one set of RCA
output connectors for connecting to line
inputs (Direct, Aux, Phono, Tuner, etc.) of your line
stage/preamplifier.
All input/output connectors are gold plated and RCAs
connect “ground” before “hot”. On disconnect, “hot” is dis-
connected first.
NOTE:
A "passive" line stage is not recommended for use
with the Ref Phono 2 as it may not provide the gain neces-
sary to amplify the output of the Ref Phono 2 to adequate
levels to the power amplifier.
Installation Instructions
While the Ref Phono 2 does not dissipate an unusual
amount of heat, it is important that it have a reasonable air-
flow to assure long, trouble-free operation. In addition, the
following installation guidelines will help insure maximum
sonic performance as well as reliable service.
1.
Upright and horizontal mounting is required
if extended operation (longer than one hour) is contem-
plated.
2.
Do not “stack” equipment on top of the Ref Phono 2 or
the Ref Phono 2 on top of other equipment: not only
could this cause overheating, but “hum” may be
introduced into the phono circuits from the proximity
of the power transformer of the other equipment.
3.
Do not place or operate unit on a soft or irregular surface
such as a rug. This will prevent proper ventilation.
4.
Do not operate unit without the top and bottom covers
installed. These are required both for safety as well
as shielding from interference (except in service opera-
tions).
5.
In a cabinet installation which has an enclosed back, an
exhaust fan is desirable so as not to operate the Ref
Phono 2 in overheated ambient air. Operation of vacuum
tube equipment for long periods of time in hot ambient
air will shorten tube life and increase chance of failure of
other component parts.
Operating/Start-up Procedure
1.
Secure connections between turntable, Ref Phono 2, and
line stage preamplifier.
Note:
Given the advanced perfor-
mance capabilities of the Ref Phono 2, it is extremely
important that high-quality interconnects be used for
connection to ancillary electronics.
2.
Plug 3-prong power cord into a grounded AC wall
receptacle.
3.
Turn Power switch “on.” The display will light and
MUTE ON will flash for approximately 40 seconds while
the power supply stabilizes, indicating operation of the
automatic muting circuit. After this warm-up period
MUTE ON will stay on, indicating the Ref Phono 2 is
ready for operation.
4.
Select proper input, gain cartridge loading and EQ, then
unmute and play. (see Front Panel Controls section.)
Not e :
For maximum sonic performance, a warm-up
period of at least one hour is recommended.
Servicing
Because of its careful design and exacting standards
of manufacture, your Ref Phono 2 should normally require
only minimal routine service to maintain its high level of
performance.
Model Ref Phono 2
FINAL / 1-09 - Ref Phono 2
- 3-27-09
2
