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Owner's Manual
Model PH6
PHONO PREAMPLIFIER
3900 ANNAPOLIS LANE NORTH / PLYMOUTH, MINNESOTA 55447-5447 / PHONE: 763-577-9700 FAX: 763-577-0323
www.audioresearch.com
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Contents
Model PH6
Page No.
Preface
Warnings
Packaging
Front Panel Controls
Connections
Installation Instructions
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Operating/Start-up Procedure
Servicing
Cleaning
Disposal and Recycling Guidelines
Warranty Terms and Conditions
Specifications
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Model PH6
VACUUM TUBE PHONO PREAMPLIFIER
GROUND
RIGHT LEFT RIGHT LEFT
INPUTS OUTPUTS
l l
l
PWR MUTE MONO
POWER MONO LOAD MUTE
l l l l l
47K 1000 500 200 100
TO PREVENT FIRE AND SHOCK HAZARD, DO NOT
UNIT MUST BE OPERATED IN A HORIZONTAL POSITION.
NIT CONTAINS VOLTAGES WHICH MAY BE HAZARDOUS
U
PLYMOUTH, MINNESOTA
MADE IN U.S.A.
WARNING
XPOSE THIS DEVICE TO RAIN OR MOISTURE.
E
-DO NOT OPERATE WITH COVERS REMOVED-
CAUTION
FOR PROTECTION AGAINST FIRE HAZARD
EPLACE ONLY WITH SAME RATING FUSES.
R
SERIAL VOLTS
MO DE L PH6 H IGH DEFI NITIO N
MODEL PH6
AC UU M TU BE PH ON O PR EAM PL IF IE R
V
2A FUSE
SLO-BLO
T1A (230V)
®
50 WATTS
MAXIMUM
50/60 HZ~
MODEL PH6
VACUUM TUBE
PHONO
PREAMPLIFIER
REMOTE CONTROL
POWER
LOAD
MONO
MUTE
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Model PH6
Preface
Please take the time to carefully read this instruction
anual prior to installation or use of your PH6
m
phono preamplifier. Because it is a highly advanced
electronic instrument, there are several facts and
procedures you should know before you place it in
operation.
Just as you would not purchase and attempt to operate an expensive camera, computer system
or high-performance automobile without first learning something about performance parameters and
correct operating procedures, so too your phono
pre amplifi er req uires som e fami liariza tion
before you make it part of your music reproduction
system. Your reward, in terms of maximum performance and a long service life, will be well worth the
effort.
Warnings
1.
To prevent fire, or shock hazard, do not expose
your PH6 to rain or moisture.
2.
This unit contains voltages which can cause serious injury or death. Do not operate with cover removed. Refer servicing to your authorized Audio
Research dealer or other qualified personnel.
3.
The power cord on your PH6 is equipped with a
sta ndard t hree-pr ong g roundin g plu g. For
absolute protection,
power plug.
of the PH6 chassis to provide absolute protection
from electrical shock.
4.
For continued protection against fire hazard,
replace the fuse only with the same type and
rating as specified at the fuse holder.
This provides powerline grounding
do not defeat the ground
Packaging
Save all packaging in a dry place away from
azard. Your PH6 phono preamplifier is a pre-
fire h
cision electronic instrument and should be properly
cartoned any time shipment is made. You may not
have occasion to return your unit to the factory for
service, but if that should prove necessary, or other
occasion requiring shipment occurs, the original
packaging will protect your PH6 from unnecessary
damage or delay.
Note that your PH6 has been shipped with the vacuum tubes installed in a protective foam block under
the top cover. With the PH6 unplugged, use a
phillips-head screwdriver to loosen the fastening
screws, remove the top cover and set aside. Install
the numbered tubes in their respective sockets,
refasten the top cover and store the foam block with
your carton.
Front Panel Controls
POWER ON / OFF:
panel LEDs are lit; unit defaults to“off” whenever it
is unplugged and then plugged in. Press the Power
switch to turn unit on; after approximately 30 seconds the mute LED will stop flashing and stay on
continuously (along with the power LED and chosen
cartridge loading LED) indicating unit is ready to
play.
MUTE:
30 seconds, the unit defaults to mute position indicated by continuously lit mute LED. Pressing the
Mute switch once so the mute LED is unlit unmutes
the PH6 for play; pressing the Mute switch again
lights the mute LED and mutes the PH6.
After unit is on and warmed up for at least
The unit is off when no front
DO NOT ATTEMPT TO OPERATE THIS
EQUIPMENT BEFORE INSTALLING THE VACUUM
TUBES IN THEIR PROPER SOCKETS.
REAR
TUBE LOCATIONS
TOP VIEW
V1
V2
FRONT
MONO:
stereo and mono operation; when mono LED is lit,
the PH6 is in mono, when unlit it is in stereo.
LOAD:
step through five pre-set cartridge loading options
(47K, 1000, 500, 200, and 100 ohms) with the LED lit
above the currently selected load value for listening.
It is suggested that you select the loading value
option nearest the cartridge manufacturers loading
recommendation to begin with and then listen to
alternate loading if desired.
Pressing the Mono switch selects between
Pressing the load switch allows the user to
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Model PH6
Because all four PH6 front panel functions are
duplicated on the remote, you may listen to loading
onic changes from the listening position by repeat-
s
edly pressing the Load button to scroll through the
values. (Note that volume level will decrease as
lower loading values are selected.)
Connections
INPUT CONNECTORS
input connectors, which should be connected to your
turntable/tonearm cable.
OUTPUT CONNECTORS:
RCA output connectors which should be connected
to line inputs (Direct, Aux, Spare, Tuner, etc.) of
your line stage/preamplifier. Single ended RCA-tobalanced adapt ers a re availa ble f rom A udio
Research allowing the PH6 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 PH6 as it will not provide the gain
necessary to amplify the output of the PH6 to
adequate levels to the power amplifier.
: There is one set of RCA
There is one set of
Installation Instructions
While t he PH6 d oes n ot dissipate an unusua l
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 PH6 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 PH6 to the left of the other
ha ssis, so as to pr ovide maxim um spacing
c
between the transformer of the PH6 and the other
component.
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. In a cabinet or rack-mount installation which has
an enclosed back, an exhaust fan is desirable so
as not to operate the PH6 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, PH6, and
line stage preamplifier. Note: Given the advanced performance capabilities of the PH6, it is
extremely important that high-quality interconnec ts be u sed for conne ctio n to ancillar y
electronics.
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 o peration of the automatic
muting circuit. After this warm-up period the mute
LED will stay on and the cartridge loading value
LED will light, indicating that your PH6 is ready
for operation.
4.
Unmute PH6, select proper cartridge loading and
play.
Note: 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 PH6 should normally
require only minimal routine service to maintain its
high level of performance.
CAUTION:
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 PH6 are 6H30 dual
triodes, and with normal use should not need to be
changed for approximately 2,000 hours of use.
Your PH6 contains sufficient levels of
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Model PH6
Cleaning
To maintain the visual appearance of your PH6
phono preamplifier, occasionally wipe the front
panel and top cover surfaces 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 “ brushed”
grain of the front panel finish. A dry 2-inch pure
bristle paint brush works well to remove dust from
bevels, reliefs and switches.
Disposal and Recycling Guidelines
To dispose of this electronic product, do not place
in landfill. In accordance with the European Union
Waste Electrical and Electronic Equipment (WEEE)
directive effective August 2005, this product may
contain regulated materials which upon disposal
require special reuse and recycling processing.
Please contact your dealer or importing distributor
for instructions on proper disposal of this product in
your country. Or, contact Audio Research Corporation (763-577-9700) for the name of your importing
distributor and how to contact them.
Packing and shipping materials may be disposed of
in a normal manner.
Limited Warranty
Audio Research Corporation products are covered
by a 3-Year Limited Warranty, or a 90-Day Limited
Warranty (vacuum tubes). This Limited Warranty initiates from the date of purchase, and is limited to
the original purchaser, or in the case of demonstration equipment, limited to thebalance of warranty
remaining after original shipment to the retailer or
importer.
In the United States, the specific terms, conditions
and remedies for fulfillment of this Limited Warranty
are listed on the warranty card accompanying the
product in its shipping carton, or may be obtained
from the authorized retailer or from the Audio
Research Customer Service Department. Outside the
United States, the authorized importing retailer or
distributor has accepted the responsibility for warranty of Audio Research products sold by them. The
specific terms and remedies for fulfillment of the
Limited Warranty may vary from country to country.
Warranty service should normally be obtained from
the importing retailer or distributor from whom the
product was purchased.
In the unlikely event that technical service beyond
the abilit y of the i mporter is required , Audio
Research will fulfill the terms and conditions of the
Limited Warranty. Such product must be returned at
the purchaser's expense to the Audio Research factory, along with a photocopy of the dated purchase
receipt for the product, a written description of the
problem(s) e ncoun tered, and any infor matio n
necessary for return shipment. The cost of return
shipment is the responsibility of the purchaser.
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Model PH6
Specifications
FREQUENCY RESPONSE:
60kHz; 3dB points below 0.5Hz and above 400kHz.
± 0.2dB of RIAA, 10Hz to
DISTORTION:
GAIN:
PUSH BUTTONS:
INPUT IMPEDANCE:
100 ohms with 200pF Unbalanced.
OUTPUT IMPEDANCE:
mended load 50K-100K ohms and 100pF. (10K ohms
minimum and 2000pF maximum.)
OUTPUT POLARITY:
MAXIMUM INPUTS:
10kHz).
RATED OUTPUTS:
load (output capability is 50V RMS output at
1kHz).
POWER SUPPLIES:
voltage supplies. Line regulation better than .01%.
NOI SE:
shorted input (76 dB below 1mV 1kHz input).
TUBE COMPLEMENT:
input. Solid state power supply.
5
Less than .005% at .50V RMS 1kHz output.
8dB at 1kHz (MC & MM compatible).
Power, Mute, Mono, Load.
Selectable 47K, 1000, 500, 200, or
200 ohms Unbalanced. Recom-
Non-Inverting.
70mV RMS at 1kHz (180mV RMS at
.50V RMS 10Hz to 60kHz, 100K ohm
Electronically-regulated low and high
0.15uV equivalent input noise, IHF weighted,
(2) 6H30 dual triodes with JFET
1
/2 % THD at
POWER REQUI REMENTS:
270VAC 50/60Hz) 50 watts maximum. Line fuse 2A SLO
BLO (1A SLO BLO 230V). 0.3 watts standby.
DIMENSIONS:
(25.4 cm) D. Rear chassis fittings extend 0.6" (1.5 cm).
WEIGHT:
Specifications subject to change without notice.
©2010 Audio Research Corporation.
19" (47 cm) W x 5.22" (13.2 cm) H x 10.0"
11.3 lbs. (5.1 kg) Net; 19 lbs. (8.6 kg) Shipping.
100-1 35VAC 6 0Hz (200-
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