Cary Audio Design CAD-211M User manual

CAD-211M
OPERATING MANUAL
Note:
Before installing you new CAD-211M, please read this manual carefully. This manual will
inform you of the CAD-211M specifications, proper installation procedures and operation
procedures. Also included in this manual are guidelines on how to properly service and care
for your new CAD-211M.

2
SPECIFICATIONS
Operating the CAD-211M amplifiers is a simple procedure since each unit is designed for
long term stability in virtually any home operating situation. Therefore, if the unit is
operated outside the parameters outlined in this owner’s manual, damage may result.
Please read this manual carefully before putting your new Cary Audio Design
CAD-211M mono block amplifier into operation.
The following definitions are applicable to this manual. These definitions must be
followed explicitly.
WARNING: ELECTRICAL HAZARD! MISUSE OR FAILURE TO FOLLOW
INSTRUCTIONS PROPERLY MAY RESULT IN PERSONAL
INJURY OR DEATH!
CAUTION: No risk of personal injury; however, misuse or failure to follow
instructions may result in damage of equipment.
NOTE: No risk of personal injury or equipment damage; however, misuse or
failure to follow instructions may prevent proper performance
of the equipment.
1.2
Specifications
The following section describes the CAD-211M basic specifications. Specifications are
subject to change without notice or obligation.
POWER OUTPUT: 80W
FEEDBACK: Zero
FREQUENCY
RESPONSE: 20Hz - 20KHz +
NOISE: 80dB Below Rated Output
SENSITIVITY: 2V
TUBE COMPLIMENT: 2 - 845 Output

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2 - 300B Driver
2 - 6SN7 Input
OUTPUT IMPEDANCE: 4,8 and 16 ohm
INPUT POWER
REQUIREMENTS: 117V/220V 50 - 60 Hz
POWER CONSUMPTION: 265 watts "OPERATE"
220 watts "STAND BY"
DIMENSIONS: 10"H x 12 1/4"W x 24"D
NET WEIGHT: 90 lbs
SHIPPING WEIGHT: 125 lbs
POWER
TRANSFORMER: 300 percent duty cycle wax impregnated OFC copper
OUTPUT
TRANSFORMER: 200 percent duty cycle wax impregnated OFC copper
CAPACITORS: oil filled
POWER SUPPLY
CAPACITORS: 1500MF, 450V
AC CORD: detachable
WARM-UP TIME: 5 minutes
BREAK-IN PERIOD: 100 hours of music playing time

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1.3
Top Panel Features
AC-ON SWITCH: Turns AC power on
STAND-BY SWITCH: Turns high voltage on
1.4
Rear Apron Features
OUTPUT: Three 5-way copper binding posts provide outputs for 4 ohm, 8 ohm and
16 ohm
AC: 3 conductor shielded power cord to AC power mains
INPUTS: One Single-Ended Input via gold plated RCA jack
One Balanced Input via XLR connector (Note: When using Balanced
Input, the toggle switch , located next to the XLR input jack, must
be flipped toward the XLR jack)
FUSE: AC power fuse. Never replace with any other fuse than 5 amp.
SLOW BLOW! 250 VOLT!
Tube fuse. Never replace with any other fuse than 1/2 amp.
FAST BLOW! 250 VOLT!
CAUTION
Use of any other protection
fuse can damage unit.
CAUTION
Never remove/insert
AC line cord when the
unit is "ON"

5
INSTALLATION
This section describes the unpacking and installation procedures for the CAD-211M
mono-blocks.
2.2
Unpacking
All shipping containers have been specifically designed to protect its contents and special
care has been taken to prevent damage under normal shipping conditions. Mishandling
should be evident upon inspection. If damage is found, take care not to destroy the
evidence. Document any damage with photographs and contact the transport carrier
immediately.
Carefully remove the CAD-211M amplifier from its packing carton and examine closely
for signs of shipping damage. Save all original packing cartons for future storage or after-
sale service.
2.3
Warranty Card
Fill out the enclosed Warranty Registration Card and return to Cary Audio Design within
10 days of the original purchase. Keep your original sales slip and packing cartons for
future reference. Failure to register warranty will limit the warranty to one year.
2.4
Amplifier Placement
In general, the location of the CAD-211M amplifier is not critical. The best placement of
the amplifier is near the speakers with short lengths of speaker cables. Certain precautions
must be taken to avoid radiators or other heating units. Keep the top of the CAD-211M
clear of books, paper or other equipment to protect against overheating.
WARNING
Do not attempt operation without the
bottom plate attached. Contact with
voltage in the
CAD-211M can be fatal!!!

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2.5
Power Requirements
The CAD-211M is designed to operate from house current mains. The design voltage is
117 VAC at 50/60Hz. (Foreign units 220 VAC at 50/60 Hz)
2.6
Cables
The speaker cables from the output posts to the speaker system can be any convenient
length required. Select speaker cables of sufficient size to preserve the performance
capabilities of your new CAD-211M. Heavy gauge #16 wire is suitable for distances up
to 10 feet; #12 for 25 feet. Most audio dealers will have speaker cable in stock for this
purpose.
3.1
Operation
Your new CAD-211M is ready for operation after the speaker, interconnect cables and all
the tubes have been installed. See page 8 for tube positions.
3.2
AC-On Power Switch
Simply push the AC-On switch to the "ON" position. Observe that all tubes are lit
(filaments). After 30 seconds, flip the stand-by switch to the "OPERATE" position. The
eye tube will then light.
3.3
Stand-By Switch
This is a most convenient feature on the CAD-211M amplifier. The stand-by switch is
located on the top of the amplifier. In the rear position, the amplifier is ready to operate.
In the front position, only the tube filaments are operating. You may wish to leave your
CAD-211M amps turned on in the stand-by mode 24 hours a day. When you wish to

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listen to music, simply flip the stand-by switch to the “REAR” position. Under these
conditions the CAD-211M is always ready for peak performance.
3.4
Break In Period
The tubes, capacitors and output transformer take approximately 100 hours of music
playing time to operate at peak performance. The CAD-211M may seem sterile or thin
sounding right out of the box. After the first couple of hours, you will notice increased
depth and tighter bass. This break-in period defies all engineering theory, but is true with
most audio amplifiers.
SERVICE AND CARE
4.1 Care and Cleaning
The chassis of the CAD-211M may be cleaned with a soft towel and Windex® (or a
similar window cleaner). The frequency of cleaning will be governed by how many hours
the CAD-211M is operated and by operating environmental cleanliness.
4.2 Tube Replacement
If it becomes necessary to replace the tubes in the CAD-211M amplifier, a matched set of
tubes of the same brand should be used. Although tube life varies depending on the nature
and degree of use, under normal operating conditions for home use, the tubes in the CAD-
211M should last several years or more.
4.3 Factory Service
In the design of the CAD-211M, careful consideration was given to keep maintenance
problems to a minimum. However, it is possible that problems may arise which cannot be
cured by tube substitution. At this point, contact our Customer Service Department,
[phone], to describe you problem in detail. Do not return the CAD-211M to the
WARNING
Make sure amplifier is
unplugged from AC mains
for any service or
cleaning!

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factory without a Return Authorization Number from the Customer Service Department.
Cary Audio Design will not assume responsibility for transit damage or loss if problems
are due to improper packing or lack of insurance.
WARNINGS
Make no attempt to put the CAD-211M in service outside
of the cabinet. Contact with high voltages found in the unit
can be fatal!!!
Completely remove AC Power Cord from the wall and
allow 30 minutes for the high voltage capacitors to
discharge through bleeder resistors before attempting to
change tubes or clean the inside of the amplifier.
CAUTIONS
Never remove/insert AC Plug when the unit is on or the AC
Power Switch is in the “ON” position.
Obstruction of the top portion of the CAD-211M will
result in tubes overheating.
OBSERVE DIRECTIONS IN THIS MANUAL