Audio Research PH8, Руководство пользователя

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and chosen cartridge loading value)
indicating unit is ready to play.
MUTE: After unit is on and warmed up for
at least 30 seconds, the unit defaults to
mute position indicated by continuously
lit Mute on the display. Pressing the Mute
switch once so Mute is unlit unmutes the
PH8 for play and Operate appears on
the display; pressing the Mute switch
again lights Mute and mutes the PH8.
MONO: Unit defaults to stereo at turn on.
Pressing the Mono switch selects
between stereo and mono operation, as
indicated on the display.
LOAD: Pressing the load switch allows
the user to step through five pre-set
cartridge loading options (47K, 1000,
500, 200, and 100 ohms) with the number
on the display lit for the currently
selected load value. It is suggested that
you select the loading value nearest the
cartridge
manufacturers loading
recommendation to begin with and
then listen to alternate loading if desired.
Because all four PH8 front panel
functions are duplicated on the remote,
you may listen to loading sonic changes
from the listening position by repeatedly
pressing the Load button to scroll
through
the values. (Note that
depending on the phono cartridge the
volume level may decrease as lower
loading values are selected.)
Remote Control Functions
In addition to all of the front panel
functions, the remote also accesses the
following functions:
DISPLAY: Pressing the display button on
the remote allows you to scroll through
and select from eight levels of display
brightness as well as turning the display
off.
HOURS: Pressing the hours button on the
remote will activate the total
accumulated tube hours on the display
for about seven seconds and then return
to the default load value function.
Connections
INPUT CONNECTORS: There is one set of
RCA input connectors, which should be
connected to your turntable/tonearm
cable.
OUTPUT CONNECTORS: There is one set of
RCA output connectors which should be
connected to line inputs (Direct, Aux,
Spare, Tuner, etc.) of your line
stage/preamplifier. Single ended RCA-to
balanced adapters are available from
Audio Research allowing the PH8 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 PH8 as it
will not provide the gain necessary to
amplify the output of the PH8 to
adequate levels to the power amplifier.
Installation Instructions
While the PH8 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 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 contemplated.
2. Do not ‘stack’ the PH8 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 operations).
5. If side-by-side mounting with other
equipment is employed, place the PH8
to the left of the other chassis, so as to
provide maximum spacing between