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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, 1–5 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.