Connections
INPUT CONNECTORS:
There is one set of RCA input
connectors, which should be connected to your
turntable/tonearm cable.
OUTPUT CONNECTORS:
T h e re is one set of RCA
output connectors which should be connected to line in-
puts (Direct, Aux, Spare, Tuner, etc.) of your line stage/pre-
amplifier. Single ended RCA-to-balanced adapters are
available from Audio Research allowing the PH5 to be
connected directly to a balanced input preamplifier using
single ended RCA interconnects.
All input/output connectors are gold plated and connect
“ground” before “hot”. On disconnect, “hot” is disconnected
first.
NOTE:
A "passive" line stage is not recommended for use
with the PH5 as it will not provide the gain necessary to
amplify the output of the PH5 to adequate levels to the
power amplifier.
At the performance level of the PH5, high quality
audio signal interconnect cables such as the Audio Research
Litzlink 2 are critical to preserving maximum fidelity.
Please consult your Audio Research dealer.
Installation Instructions
While the PH5 does not dissipate an unusual amount of
heat, it is important that it have a reasonable airflow to
assure long, trouble-free operation. In addition, the follow-
ing 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” the PH5 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.
If side-by-side mounting with other equipment is
employed, place the PH5 to the left of the other chassis,
so as to provide maximum spacing between the trans-
former of the PH5 and the other component.
6.
In a cabinet or rack-mount installation which has an
enclosed back, an exhaust fan is desirable so as not to
operate the PH5 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, PH5, and line
stage preamplifier.
N o t e :
Given the advanced perfor-
mance capabilities of the PH5, it is extremely important
that high-quality interconnects be used for connection to
ancillary electronics. Audio Research brand intercon-
nects, in either unshielded or RFI-shielded configura-
tions, are strongly recommended. Your authorized Audio
Research dealer can assist you in determining which type
and lengths are optimal for your system.
2.
Plug 3-prong power cord into a grounded AC wall
receptacle.
3.
Turn Power switch “on.” The green “Power” LED will
light and the mute LED will flash for approximately
30 seconds while the power supply stabilizes, indicating
operation of the automatic muting circuit. After t h i s
warm-up period the mute LED will stay on and the
cartridge loading value LED will light, indicating that
your PH5 is ready for operation.
4.
Unmute PH5, select proper cartridge loading and play.
Not e :
For superior 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 PH5 should normally require only
minimal routine service to maintain its high level of
performance.
C A U T I O N :
Your PH5 contains sufficient levels of voltage
and current to be lethal. Do not tamper with a component
or part inside the unit. Refer any needed service to your
authorized Audio Research dealer or other qualified
technician.
The vacuum tubes inside your PH5 are 6922 dual
triodes, and with normal use should not need to be
changed for approximately 2,000 hours of use.
Model PH5
2
