Cary Audio Design Stereo Amplifier CAD 300 SEI User Manual

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CAD 300 SEI  
Single-ended Integrated Stereo Amplifier  
 
IMPORTANT SAFETY INSTRUCTIONS  
WARNING: The triangle with the lightning flash symbol displayed on the unit advises the user of dangerous  
uninsulated voltage inside the product’s enclosure.  
CAUTION: To reduce the risk of electric shock, do not remove the cover. There are no user-serviceable parts inside; it  
is recommended that only qualified personnel service this component.  
ALERT: The triangle with the exclamation point symbol on the component suggests that the owner refer to  
important operating and maintenance instructions in the owner’s manual.  
1. OWNER’S MANUAL: Before powering up the equipment, read all safety and operating instructions and follow  
them as instructed. Retain the safety and operating instructions for future reference.  
2. ATTACHMENTS: Use only those attachments recommended by the unit manufacturer, as others may cause  
hazards.  
3. ACCESSORIES: Do not place the unit on an unstable cart, stand, tripod, bracket, or table. The unit may fall,  
causing injury to a person or damage to the unit. Mount the unit according to the manufacturer’s instructions with  
the suggested mounting accessory.  
4. WALL OR CEILING MOUNTING: Mount the unit to a wall or ceiling only in the manner recommended by the  
manufacturer.  
5. WATER AND MOISTURE: Do not use the unit near water (for example, near a swimming pool, bath tub, wash  
bowl, kitchen sink, or laundry tub) or in a damp environment (like a basement or outside in the rain).  
6. OBJECT AND LIQUID ENTRY: Do not push objects of any kind into the unit through openings as they could touch  
dangerous voltage points and short-out parts, possibly resulting in a fire or electric shock. Avoid spilling liquid of any  
kind on the unit. If water or any metal object (such as a paper clip, coin, or staple) accidentally falls inside the unit,  
disconnect it from the AC power source immediately and contact Cary Audio Design for further instructions.  
7. HEAT: Position the unit away from heat sources such as radiators, heat registers, stoves, or other units  
(including amplifiers) that produce heat.  
8. VENTILATION: Slots and openings in the cabinet create ventilation to protect the component from overheating.  
These openings on the top and bottom panels must remain unobstructed. Allow at least 6 inches (16cm) of clearance  
above the unit and an opening behind the unit for airflow. Do not place the unit on a  
bed, sofa, rug, built-in bookcase, or rack without adequate ventilation.  
9. GROUNDING OR POLARIZATION: As a safety feature, the unit may be equipped with a polarized alternating  
current line plug in which one blade is wider than the other. This plug will fit into the power outlet only one way. If  
you cannot insert the plug fully into the outlet, try reversing the plug. If the plug still will not fit, contact a licensed  
electrician to update your obsolete outlet. Do not defeat the safety purpose of the polarized plug.  
10. POWER SOURCES: Operate the unit only from the power source indicated on the marking label. If you are  
unsure of the type of power supplied to your home, consult your unit dealer or local power company.  
11. POWER CORD PROTECTION: Arrange power supply cords so that they do not suffer from foot traffic or pinching  
by items placed on or against them. Pay close attention to cords where plug enter the AC outlet and where they exit  
from the unit.  
12. LIGHTNING: For added protection during a lightning storm or when is the component is idle for long periods of  
time, unplug the unit from the wall outlet and disconnect the antenna or cable system. This will help protect the  
unit from lightning and power line surge damage.  
13. POWER LINES: Do not locate an outside antenna system in the vicinity of overhead power lines or other electric  
light or power circuits. When installing an outside antenna system, take extreme care to avoid touching the power  
lines or circuits; contact with them could be fatal.  
14. OVERLOADING: Do not overload wall outlets, extension cords, or integral convenience receptacles as this  
increases the risk of fire or electric shock.  
2
 
IMPORTANT SAFETY INSTRUCTIONS  
15. REPLACEMENT PARTS: When replacement parts are required, be sure the service technician has used replacement  
parts specified by the manufacturer or those having the same characteristics as the original parts. Unauthorized  
substitutions may result in fire, electric shock or other hazards.  
16. SAFETY CHECK: Upon completion of any service or repairs to the unit, ask the service technician to perform safety  
checks to ensure the unit is in proper operating condition.  
17. IMPORTANT SAFETY NOTE:  
Before connecting a new product such as the CD 303T to your audio or home theater system, turn off all other  
equipment (preferably unplugging them from the AC power source). Many audio components feature automatic turn-  
on circuits that may activate during an installation, potentially causing damage to electronic components and/or  
speakers. This type of damage is not covered by product warranties, and Cary Audio specifically disclaims responsibility  
for any such damage.  
Power Cord: The removable power cord provided with your player was specifically designed for use  
with this product, but other AC cords may be used. Consult your dealer for advice on AC power  
cords and high quality wire in your system.  
AC Fuse: The fuse is located inside the chassis and is not user serviceable. If the unit does not  
power up, contact an authorized service representative  
Wiring: Cables running inside walls should have the appropriate markings to indicate compliance and listing by the  
UL, CSA or other standards required by the UL, CSA, NEC or your local building code. Questions about cables inside  
of walls should be referred to a qualified custom installer, a licensed electrician, or low-voltage contractor.  
18. RECORDING COPYRIGHT: Recording of copyrighted material for other than personal use is illegal without  
permission of the copyright holder.  
19. NOTE TO CATV SYSTEM INSTALLER: This reminder is provided to call the CATV system installer's attention to article  
820-40 of the NEC, ANSI/NFPA 70, which provides guidelines for proper grounding and, in particular, specifies that the  
cable ground shall be connected to the grounding system of the building as close to the point of cable entry as practical.  
20. FCC INFORMATION FOR USER:  
CAUTION: Any changes or modifications not expressly approved by Cary  
Audio Design could void the user's authority to operate the equipment.  
NOTE: This equipment has been tested and found to comply with the limits for a  
Class B digital device pursuant to Part 15 of the FCC Rules.  
These limits are designed to provide reasonable protection against harmful interference in a residential installation.  
This equipment generates and can radiate radio frequency energy, and if not installed and used in accordance with the  
instructions it may cause harmful interference to radio communications. However, there is no guarantee that  
interference will not occur in a particular installation. If this equipment does cause harmful interference to radio or  
television reception, which can be determined by turning the equipment off and on, the user is encouraged to try to  
correct the interference by one or more of the following measures:  
Reorient or relocate the receiving antenna.  
Increase the separation between the equipment and receiver.  
Connect the equipment into an outlet on a circuit different from where the receiver is connected.  
21. OUTDOOR ANTENNA INSTALLATION/SAFE ANTENNA AND CABLE CONNECTION:  
If an outside antenna or cable system is connected to the equipment, be  
sure the antenna or cable system is grounded in order to provide  
protection against built-up static charges and voltage surges. Article 810  
of the National Electrical Code, ANSI/NFPA 70 (in Canada, Part 1 of the  
Canadian Electrical Code) provides information regarding proper  
grounding of the mast and supporting structure, grounding of the lead-in  
wire to an antenna discharge unit, size of grounding conductors, location  
of antenna discharge unit, connection to grounding electrodes and  
requirements for the grounding electrode.  
Outside antenna system should be located well away from power  
lines, electric light or power circuits and where it will never come into  
contact with these power sources if it should happen to fall. When  
installing an outside antenna, extreme care should be taken to avoid  
touching power lines, circuits or other power sources as this could be fatal. Because of the hazards involved, antenna  
installation should be left to a professional.  
3
 
INTRODUCTION  
Congratulations!  
You have purchased one of the most exotic vacuum tube audio integrated amplifiers available. Within its  
power range, the CAD 300 SEI integrated amplifier offers the most realistic sound reproduction one could  
desire for a “high-end” home audio system. Careful design, parts selection and proper circuit topologies  
contribute to the incredible reliability and enjoyment.  
For the technically minded, a review of the circuit is in order. Your new CAD 300 SEI operates in a class A  
single-ended mode utilizing an auto bias (cathode) system for the 300B triode output tubes. The input  
preamplifier section utilizes a 6SN7 dual triode tube. One triode section of this dual tube is used for the  
left channel and the other triode section is used for the right channel. This circuit is a Class A voltage  
gain circuit. This is the same basic first stage input circuit utilized in the Cary Audio model SLP 98  
preamplifier. The next gain stage in the CAD 300 SEI utilizes a 6SN7 dual triode wired in a series  
constant-current plate-loaded configuration. This stage is duplicated for each channel. The series  
constant-current configuration then drives the 300B triode output stage in single-ended, class A. The  
output transformers in the CAD 300 SEI are the most important components in the amplifier and have  
been specifically designed by Cary Audio for use in the CAD 300 SEI. The output transformer is an air-  
gap design with a commercial continuous rating of 200% duty cycle. The CAD 300 SEI output  
transformer is an E/I laminate, silicon impregnated, grain oriented steel design. The windings are wax  
impregnated and the entire transformer is potted in high temperature wax. Utilizing the linear, directly  
heated filament-cathode 300B triode output tube, there is no global feedback used in the CAD 300 SEI.  
The power supply is a full wave center tap configuration running high voltage, high current fast switching  
diode rectifiers. The rectified 450 VDC is fed to a PI-L filter network. The filter capacitor consists of two  
(2) 1200 MFD and 230 Joules of energy storage. Each electrolytic capacitor is by-passed with a low  
impedance .22 polystyrene capacitor. The power transformer is a 200% duty cycle rating on the CAD 300  
SEI. To avoid AC hum, both the 6SN7 and 300B tube have DC voltage on the filaments. This will prevent  
AC ripple voltage from capacitively being coupled to the elements in the tubes.  
Additional Design Thoughts  
A great deal of attention during the design of your new CAD 300 SEI was concentrated on the “overload  
recovery” ability of the amplifier to instantly recover from clipping and is a much more important issue  
tan is commonly believed. In the power war of amplifier manufacturers the mentality is focused on high  
and then even higher power output to solve the clipping problem. When in reality, the most critical  
aspect is how fast a recovery an amplifier can achieve after overload. Most of the music being listened to  
in an average listening room is only requiring about 3 watts of power. It is on the transients of loud low  
frequency program material that tremendous signal voltages will appear at the input of the amplifier. It is  
in this situation that the overload recovery ability of an amplifier is of critical concern. The single-ended  
CAD 300 SEI extols its merits in the ability to handle transients and instantaneously recover from brief or  
even extended overloads. The CAD 300 SEI will overload symmetrically at any frequency in the audio  
band pass. The CAD 300 SEI will also yield faithful reproduction of extremely low frequencies at full  
output levels. Power transformer, power supply regulation and output transformer design and careful  
shaping of the overall frequency response curve all play a very important part in the ability of the CAD  
300 SEI to recover quickly when overloaded. If one were to monitor the high voltage rail voltage (385  
VDC at the anode of the 300B tube) of a CAD 300 SEI during soft and loud music passages it will be  
found there is no more than a volt or so change from soft to loud passages.  
Another technical feature of your new CAD 300 SEI is amplifier stability. The CAD 300 SEI may be  
operated with no load (without speaker) without damage to the amplifier, output transformer or tubes.  
This is the hallmark of a high performance, STABLE, amplifier circuit design.  
4
 
INTRODUCTION  
The most exciting feature of the CAD 300 SEI, aside from how compact and gorgeous it looks, is the  
delightful, sensual beauty of the music it recreates. The first thing that will strike you about your CAD 300  
SEI integrated amplifier is the incredible transparency and resolution of detail of the music. The CAD 300  
SEI sensual nature is best revealed in the sense of life it displays in female vocalists.  
Your new CAD 300 SEI presents music with such presence and directness, you’ll be drawn into the music  
hour after musically satisfying hour. This is the result of single-ended circuit techniques, which eliminate  
crossover notch at low levels and also contributes to the freedom from listening fatigue. The CAD 300 SEI  
will draw you in even further as you realize how lucid and utterly uncolored neutrality reveals delicate  
nuances in the sound stage.  
Enjoy the music!  
5
 
SPECIFICATIONS  
This section describes the basic specifications of the CAD 300 SEI at the time of printing. Specifications  
are subject to change without notice or obligation. When the following cautionary terms are used in this  
manual, these definitions apply:  
WARNING  
Electrical hazard! Misuse or failure to follow instructions properly may  
result in personal injury or death!  
CAUTION  
No risk or personal injury; however, misuse or failure to follow instructions  
may result in damage to equipment.  
NOTE  
No risk of personal injury or equipment damage; however, misuse or failure  
to follow instructions may prevent proper performance of the equipment.  
............................................................................................................................................................  
CIRCUIT TYPE Single-ended, Class A  
............................................................................................................................................................  
INPUTS CD, AUX 1, AUX2  
............................................................................................................................................................  
POWER OUTPUT 4/8 ohms = 15 watts/CH  
............................................................................................................................................................  
S/N 90dB below rated power output  
............................................................................................................................................................  
FREQUENCY RESPONSE 23 20,000 Hz (+0 0.75dB)  
............................................................................................................................................................  
HEADPHONE OUTPUT 4-50 ohm compatible ¼” 3 circuit jack  
............................................................................................................................................................  
POWER TRANSFORMERS 1 - EI laminated, 200% duty cycle  
............................................................................................................................................................  
OUTPUT TRANSFORMERS  
200% duty cycle  
Air gapped, wound with OFC copper wire, wax impregnated  
............................................................................................................................................................  
RESISTORS 1% metal film  
............................................................................................................................................................  
WIRE Silver double “E” teflon  
............................................................................................................................................................  
COUPLING CAPS Oil filled  
............................................................................................................................................................  
POWER SUPPLY CAPACITORS 2 1200mfd @ 450 VDC, Total 2400 MFD 230 Joules  
............................................................................................................................................................  
WIRING Point - to - point  
............................................................................................................................................................  
LINE INPUT 3 switchable selections  
............................................................................................................................................................  
SPEAKER POSTS 5-way Copper  
............................................................................................................................................................  
TUBE SOCKETS Ceramic with silver pins  
............................................................................................................................................................  
ADDITIONAL FEATURES  
Soft shoe feet  
Detachable power cord  
6
 
SPECIFICATIONS  
............................................................................................................................................................  
TUBE COMPLIMENT  
2 300B triode output tubes in Class A single-ended (CAVT  
300B tubes)  
1 6SN7 input tube  
2 6SN7 driver tubes  
............................................................................................................................................................  
WARM-UP TIME 3 minutes  
............................................................................................................................................................  
BREAK-IN PERIOD 100 hours of music playing time  
............................................................................................................................................................  
FINISH  
Jaguar® medium blue chassis with black anodized aluminum  
front panel  
............................................................................................................................................................  
DIMENSIONS 8" H x 14" W x 14" D  
............................................................................................................................................................  
WEIGHT 42 lbs.  
............................................................................................................................................................  
7
 
FEATURES  
Front Panel  
............................................................................................................................................................  
AC - ON SWITCH  
............................................................................................................................................................  
INPUT SELECTOR Selection of line inputs for listening (CD, AUX1, AUX2)  
............................................................................................................................................................  
VOLUME Dual precision potentiometer controlling volume of both channels  
............................................................................................................................................................  
Turns AC power on in the “UP” position  
BALANCE  
Dual precision potentiometer to balance between left and right  
channels  
............................................................................................................................................................  
HEADPHONE 3 conductor stereo headphone jack for headphones  
............................................................................................................................................................  
OUTPUT SELECTOR  
Switches amplifier output from speakers to headphones. When  
blue LED lights, the headphone jack is activated. (located on top  
right of chassis)  
............................................................................................................................................................  
Rear Apron  
............................................................................................................................................................  
INPUTS  
............................................................................................................................................................  
SPEAKER OUTPUT High quality 5-way binding posts provide output to the speakers  
............................................................................................................................................................  
POWER CORD 3 conductor shielded power cord to AC power mains  
............................................................................................................................................................  
Signal input connection via shielded interconnect cables  
FUSE  
AC power fuse. Never replace with any other fuse than  
2 AMP SLOW BLOW! 250 VOLT  
............................................................................................................................................................  
TUBE FUSE Never replace with any other fuse than ¼ AMP FLAST BLOW!  
............................................................................................................................................................  
CAUTION  
EQUIPMENT DAMAGE MAY OCCUR WITH IMPROPER FUSES.  
NEVER REMOVE / INSERT AC LINE CORD WHEN THE UNIT IS ON.  
WARNING  
MAKE NO ATTEMPT TO PUT THE CAD 300 SEI AMPLIFIER IN SERVICE  
WITHOUT THE BOTTOM PLATE ATTACHED - CONTACT WITH VOLTAGE IN  
THE UNIT CAN BE FATAL!  
8
 
INSTALLATION  
This section describes the unpacking and installation procedures for your new component.  
Unpacking  
All Cary Audio Design shipping containers have been specially designed to protect their contents and  
special care has been taken to prevent damage under normal shipping conditions. Mishandling should be  
evident upon inspection of the shipping container. If shipping damage is found after visual inspection,  
take care not to destroy the evidence. If necessary, document the damage with photographs and contact  
the transport carrier immediately.  
Carefully remove your new component from its packing carton and examine it closely for signs of  
shipping damage. We strongly recommend saving all original packing cartons to protect your amplifier  
from damage should you wish to store it or ship it for after-sales service.  
Warranty Card  
IN THE USA: If you are the original purchaser of a new unit from an AUTHORIZED CARY AUDIO  
DESIGN DEALER, please fill out the enclosed warranty registration card and return it to Cary Audio  
Design within 15 days of your purchase. Cary Audio Design also suggests that you keep your original  
packing cartons in case you ever need to ship the unit when moving to a new home. Warranty  
restrictions apply. Consult the warranty section at the end of this manual for details. Please be certain to  
keep a copy of the original sales receipt from your AUTHORIZED CARY AUDIO DESIGN DEALER to  
validate the warranty if ever needed. The warranty is for the original purchaser only and does not  
transfer to any subsequent owner.  
OUTSIDE THE USA: Your local Authorized Cary Audio Design Distributor will make his own warranty  
policy for your country. Please check with them for the terms of warranty for your new amplifier.  
Placement  
In general, the location of your new CAD 300 SEI amplifier is not critical. The best placement in your  
system is near the speaker system with short lengths of speaker cables. Certain precautions must be  
taken to ensure optimum performance. Avoid extremely hot locations such as near radiator or other  
heating units. Keep the top of the CAD 300 SEI clear of books, paper or other equipment to protect  
against overheating.  
Power Requirements  
The CAD 300 SEI is designed to operate from house current mains. The design voltage is 117 VAC at  
50/60Hz. (Foreign units 220 VAC at 50/60Hz.)  
Cables  
The speaker cables from the output posts of the CAD 300 SEI to the speaker system can be any  
convenient length your set-up requires. Select speaker cables of sufficient size to preserve the  
outstanding performance capabilities of your CAD 300 SEI. Heavy gauge #16 wire is suitable for  
distances up to 10 feet; #12 for 25 feet. Most audio dealers will have proper speaker cable in stock for  
this purpose.  
9
 
OPERATION  
Signal input connection is made via the input jacks on the rear of the CAD 300 SEI located next to the  
output binding posts. The interconnect cables from the output of the preamplifier can be any convenient  
length your set-up requires. The choice of a high quality interconnect cable is important. Once again,  
your audio dealer will have the proper cables in stock for this purpose.  
Your new CAD 300 SEI is ready for operation after the speaker, interconnect cables, and the tubes have  
been installed. Refer to the tube placement sheet at the end of this manual for proper installation.  
AC On Power Switch  
Simply push the AC rocker switch on the ON position. Observe that the blue LED lights and all tubes are  
lit (filaments).  
Break-In Period  
The tubes, capacitors and output transformers take approximately 100 hours of music playing to fully  
settle in for peak performance. The CAD 300 SEI will sound good right out of the box and will improve  
with use. After the first couple of hours you will notice increased depth and tighter bass. This break-in  
period is true with vacuum tube based audio amplifiers.  
Bias Adjustment Procedures  
Look to the left rear corner of the CAD 300 SEI. You will notice a slotted screwdriver adjustment control.  
This is the bias adjust potentiometer. Also located in line with this control is a ¼” headphone style jack.  
This will accept the included orange/black test cable. These two leads will hook to a DC current meter or  
digital multimeter.  
1. Make sure the CAD 300 SEI is in the off position with all the tubes inserted into the proper  
sockets.  
2. Plug in the two-conductor test cable into the ¼” jack. Clip the black alligator clip to the black  
negative lead on your multimeter. Hook the red alligator clip to the red positive lead from the  
multimeter.  
3. Place the multimeter range selector in the DC current range. This may say 0 300 mA. Just  
make sure you are reading DC current. Never select the DV voltage position. Only the DC current  
scale.  
4. Locate a proper flat blade screwdriver that fits the slot on the bias adjustment control.  
5. With your CAD 300 SEI plugged into the house AC mains wall socket turn on the AC power  
switch. Immediately observe the DC current reading. The proper value will be 150 to 160 mA.  
6. If the value is low, turn the bias control clockwise (right) a small amount. If the current reads  
higher than 160 mA. Turn the bias adjustment control counter clockwise (left).  
7. After the 300 SEI has been on for about ten minutes recheck the bias and reset to 150 to 160  
mA Range. This completes the bias setting. You may wish to check this setting every six months  
or so. Please note that the bias will vary as your AC line voltage moves up and down in your  
home. This is normal. The amplifier will operate in a broad range of 120 mA to 180 mA of  
current. The value of 150 to 160 is the ideal point.  
8. Turn off your CAD 300 SEI and remove the test cable and store this cable in a convenient  
location in your listening room.  
WARNING  
MAKE SURE AMPLIFIER IS UNPLUGGED FROM AC MAINS BEFORE SERVICING.  
10  
 
DIAGRAMS  
Bias Adjustment  
Insert the meter plug into the bias jack. Adjust for 150 mA to 160 mA reading on volt ohm meter or DC  
current meter. Re-adjust the setting after the amp has warmed up for 10 minutes. Remove the bias  
adjustment plug and enjoy the music!  
Adjust bias pot until meter reads 160mA  
11  
 
DIAGRAMS  
300B Tube  
12  
 
DIAGRAMS  
Tube Placement Chart  
CAUTION  
Large pins on the 300B output tubes must be inserted into the large holes  
in the tube socket. Failure to follow these instructions will result in serious  
damage to the tubes and amplifier and is not covered by the  
manufacturer’s warranty.  
13  
 
SERVICE AND CARE  
The chassis may be cleaned with a soft towel and Windex® or a similar window cleaner. Spray it on the  
cleaning cloth to moisten it, not on the component. Do not use solvents or harsh chemicals to clean the  
preamplifier. They may remove the labels from the chassis. The frequency and need of cleaning will be  
governed by operating environmental conditions. Avoid letting the component become dusty or wet. A  
‘feather duster’ type cleaner will also work well for cleaning the component.  
Tube Replacement  
If it becomes necessary to replace the tubes in the CAD 300 SEI amplifier, a matched set of output tubes  
of the same brand should be used. A new tube kit is available from Cary Audio Design. You should get a  
few years or more from the output tubes with everyday usage and many, many years of use from the  
6SN7 input tube and 6SN7 driver tubes.  
Factory Service  
Careful consideration has been given to the design of this product to keep maintenance problems to a  
minimum. If the problem is not easily solved, we suggest that you contact our Customer Service  
Department by phone at (919) 355-0010, 15 pm Eastern Standard Time, to describe your problem in  
detail. DO NOT return the component to the factory without a Return Authorization Number (RA) from  
the Customer Service Department.  
Cary Audio Design assumes no responsibility if the transportation company refuses to pay a damage  
claim due to your improper packing or lack of insurance should the unit be lost in shipment. We strongly  
suggest using the original packing cartons for shipping any Cary Audio Design component.  
Non-Warranty Repairs  
Cary Audio Design will provide repair service for its products charging on a time and expense basis. At  
this time, the standard non warranty service bench fee is $125 with all parts used for repair charged  
extra. This may change with time and is not a quote for service. Please call us at 919-355-0010 for more  
information about out of warranty service and repair fees.  
WARNINGS  
MAKE NO ATTEMPT TO PUT THE CAD 300 SEI IN SERVICE WITH THE  
BOTTOM PLATE REMOVED. CONTACT WITH HIGH VOLTAGES FOUND IN THE  
UNIT CAN BE FATAL. COMPLETELY REMOVE AC POWER PLUG 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 300 SEI WILL RESULT IN TUBES OVERHEATING.  
14  
 
LIMITED WARRANTY  
Cary Audio Warrants to the original United States purchaser for use in the United States  
the Following Cary Audio Products for the Periods Indicated:  
1. Power Amplifiers, Integrated Amplifiers, Surround Sound Processors, and Preamplifiers have  
a three (3) year parts and labor warranty from the date of the original purchase from Cary  
Audio.  
2. CD or SACD players, DVD players, or Music Servers have an eighteen (18) month parts and  
labor warranty from the date of the original purchase from Cary Audio.  
3. Vacuum tubes, if any are used in the component, are offered a 90-day exchange policy  
against defects with the exception of the CAVT 300B vacuum tube that has a one (1) year  
exchange policy from the date of the original purchase from Cary Audio.  
What is Covered and What is Not Covered  
Except as specified below, this warranty covers parts and labor to correct all defects in materials and  
workmanship. The following are not covered by the warranty:  
1. Damage, deterioration, malfunction or failure to meet performance specifications resulting  
from:  
a. Accident, acts of nature, misuse, abuse, neglect or unauthorized product  
modifications  
b. Improper installation, removal or maintenance, or failure to follow instructions  
supplied with the product.  
c. Repair or attempted repair by anyone not authorized by Cary Audio to repair the  
product.  
d. Any shipment of the product (claims must be presented to the carrier).  
e. Any cause other than a product defect.  
2. Cleaning, initial set-up, check-ups with no defects found, or charges incurred for installation,  
removal or reinstallation of the product.  
3. Any product, on which the serial number has been defaced, modified or removed.  
4. Batteries.  
5. Accessories, including but not limited to, batteries, cables, mounting hardware and brackets,  
cleaning accessories, antenna and detachable power cords.  
6. Warranty is void if purchase was made from anyone other than an authorized Cary Audio  
dealer.  
Who May Enforce the Warranty?  
This warranty extends to products purchased directly from Cary Audio or an authorized Cary Audio  
dealer. Purchasers should inquire of the dealer regarding the nature and extent of the dealer’s  
warranty, if any.  
To obtain such warranty service, the original purchaser must complete and send in the Warranty  
Registration Card within 15 days of purchase.  
15  
 
LIMITED WARRANTY  
What Will We Pay For?  
We will pay for all labor and material expenses for items covered by the warranty. Payment of  
shipping charges is discussed in the next section of this warranty.  
How You Can Get Service?  
In the event that the owner needs to return the unit to Cary Audio for service or repair of a possible  
defect, he must follow the following steps:  
1. Contact Cary Audio at 919-355-0010 to obtain a Return Merchandise Authorization (RMA)  
number prior to shipping; include this number with the package  
2. Submit a copy of the original sales receipt; blank receipts will not validate the limited  
warranty for service by Cary Audio. The original sales receipt must contain the following  
information:  
a. The authorized Cary Audio dealer’s name  
b. The date of purchase  
c. The unit’s sales price  
d. The buyer’s name and address  
e. Describe in detail the problem.  
f. Note the unit’s model number and serial number.  
3. Deliver by either of these methods:  
a. With all freight and insurance charges prepaid and in its original packing container  
or equivalent, ship the component to Cary Audio, 1020 Goodworth Drive Apex, NC  
27539.  
b. Hand-deliver the product to Cary Audio (address noted above) or the nearest  
authorized service facility.  
Limitation of Implied Warranties  
All implied warranties, including warranties of merchantability and fitness for particular purchase, are  
limited in duration to the length of this warranty.  
Exclusion of Damages  
Cary Audio’s liability for any defective product is limited to repair or replacement of the product at  
Cary Audio’s option. Cary Audio shall not be liable for damage to other products caused by any  
defects in Cary Audio products, damages based upon inconvenience or loss of use of the product, or  
any other damages, whether incidental, consequential, or otherwise.  
16  
 
LIMITED WARRANTY  
How State Law Relates to the Warranty  
Some states do not allow limitations on how long an implied warranty lasts and/or do not allow the  
exclusion or limitation of incidental or consequential damages, so the above limitations or exclusions  
may not apply to you.  
This warranty gives you specific legal rights, and you may also have other rights which vary from  
state to state.  
International Purchasers (Export Markets)  
Cary Audio warrants its merchandise to purchasers within the United States exclusively for use  
within the United States. It provides no other warranties, expressed or implied. If you are living  
outside of the United States, please consult your local dealer or distributor to determine the details  
of your local warranty.  
17  
 
CARY AUDIO DESIGN  
1020 Goodworth Drive, Apex, NC 27539  
phone 919-355-0010  
fax 919-355-0013  
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