Bias Measurement, Tube Replacement | Cary Audio Design CAD-280SA

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.

WARNING

MAKE SURE AMPLIFIER IS UNPLUGGED FROM AC MAINS BEFORE

SERVICING

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.

4.2Tube 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.

CAD-280SA specifications

Cary Audio Design has long been revered for its commitment to high-performance audio equipment, and the CAD-280SA is no exception. As a versatile and powerful amplifier, the CAD-280SA exemplifies the company's dedication to delivering superior sound quality.

At the core of the CAD-280SA is its robust design, featuring a stereo configuration that includes both push-pull and single-ended output stages. This dual design allows users to switch between multiple operating modes, enabling them to tailor the amplifier's performance to their unique listening preferences. With a power output of 280 watts per channel, the CAD-280SA is capable of driving a wide variety of speakers with ease, offering a dynamic listening experience that is both engaging and immersive.

One of the standout features of the CAD-280SA is its use of vacuum tubes in the signal path, which imparts a warmth and richness to the sound that is often sought after by audiophiles. This tube circuitry is complemented by solid-state technology in the output stage, which helps achieve high levels of efficiency while maintaining exceptional audio fidelity. The combination of these technologies allows the CAD-280SA to deliver clear, nuanced sound across a broad frequency range.

The CAD-280SA also incorporates advanced filtering and power supply design, ensuring that it maintains stability and performance even during intense audio passages. With a low noise floor and excellent transient response, this amplifier excels in preserving the details and dynamics of the original recording. Cary Audio has placed significant emphasis on build quality, using premium components throughout the amplifier, including custom transformers and high-grade capacitors, which contribute to its reliability and long-term performance.

In terms of connectivity, the CAD-280SA offers extensive options, making it suitable for various audio setups. It includes multiple input selections, allowing it to integrate seamlessly into different systems while accommodating a range of source components. The stylish chassis design not only contributes to its aesthetic appeal but also aids in effective heat dissipation, ensuring the amplifier remains cool during prolonged use.

In conclusion, the Cary Audio Design CAD-280SA is a powerful and versatile amplifier that combines cutting-edge technology with classic tube sound. Its impressive power output, dual operating modes, high-quality components, and thoughtful design make it an excellent choice for audiophiles seeking a robust and flexible audio solution that faithfully reproduces music with warmth and clarity.