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3.6 Bias Measurement
The bias is factory preset. It is a good idea to measure it during the initial setup to make
sure it is set to the specifications provided at the end of this manual. The AC voltage
may be different from one area to the next. Follow the instructions provided. (250-275
mA is the recommended bias setting range, per side, with 220 mA being the minimum
suggested bias level setting) Make certain to set the test meter used to mA range.
SERVICE AND CARE
4.1 CAD-280 SA (V-12R) Care and Cleaning
The case and front of the amplifier may be cleaned with a soft cloth and Windex or a
window cleaner. Moisten the cleaning rag; do not get the amplifier wet. The relative
frequency of cleaning will be governed by the operating environment cleanliness. The
chassis is best polished with non-abrasive car wax.
4.2 Tube Replacement
If it becomes necessary to replace the tubes in the amplifier, a matched set of output
tubes of the same name brand should be used. A new tube kit is available from Cary
Audio. You should get a few years or more from the output tubes with everyday usage
and many years of use from the smaller 12BZ7 and EL-84 tubes. Other types of output
tubes may be used in the V-12R power amplifiers; 6L6, 6V6, KT-66, KT-88, 6550C, KT-
90, KT-99 or EL-34 tubes are all acceptable for use in the output stage.
4.3 IN FACTORY SERVICE
Careful consideration has been given to the design of your V-12R amplifier to keep
maintenance problems to a minimum. However, it is possible that some problems may
arise which cannot be cured by a vacuum tube substitution. At this point we suggest you
contact our Customer Service Department phone number (919) 355-0010 to describe
your problem in detail. DO NOT return the amplifier to the factory without a return
authorization number (RMA) from the Customer Service Department. Please always
use the ORIGINAL PACKING BOXES from Cary to ship your amplifier for moving or
for service. Cary Audio Design, Inc. will assume no responsibility if the transportation
or shipping company refuses to pay a damage claim due to your improper packing or
lack of insurance should the unit be lost or damaged in shipment.
All mentions of in factory service are relevant for Cary Audio Design products purchased
and used exclusively within the USA only. Non USA distributors of Cary Audio Design
products will establish their own local warranty or after service policies. Ask your
dealer about local warranty policies in your locale, if you reside outside the USA.
WARNING
MAKE SURE AMPLIFIER IS UNPLUGGED FROM AC MAINS BEFORE
SERVICING