1.3 Front Panel Features

POWER ON/OFF SWITCH: AC mains switch and high voltage in “ON” position

HV LED: Indicates the high voltage supply is ON and the fuse is intact.

BIAS L led: Indicates the Bias voltage for Left channel (Left chassis side for Mono)

BIAS R led: Indicates the Bias voltage for Right channel (Right chassis side for Mono)

OPERATE/STANDBY SWITCH: Turns filaments on in the “OPERATE” position.

1.4 Rear Apron Features

INPUTS RCA or XLR: Signal input connection via shielded interconnect cable

RCA/ XLR SWITCH: Switches between RCA and XLR input selection.

SPEAKER OUTPUT: Three- 5-way binding posts provide the signal output to the speaker system. Red = +, 4 or 8 ohms, Black = -, ground

BIAS JACK: _” ‘phone plug’ jack for supplied cable with plug to measure the output tube bias levels. See tube bias instruction sheet later in the manual.

BIAS POTENTIOMETER: Adjusts to achieve the bias level setting for the output tubes.

AC: 3- conductor shielded power detachable cord to AC power mains.

CAUTION

EQUIPMENT DAMAGE MAY OCCUR WITH IMPROPER RATED FUSES

POWER AC FUSE: This is an over current protection fuse for the power transformer. Never replace with any other fuse than 3 AMP SLOW BLOW!

250 VOLT! (2 AMP SLOW BLOW IN 220 VAC OPERATION)

FILAMENT FUSE: This is an over current protection fuse for the filament transformer. Never replace with any other fuse than a 2 AMP SLOW BLOW!

(1 AMP SLOW BLOW IN 220 VAC OPERATION.)

LEFT AND RIGHT TUBE (side) FUSE: This is a protection fuse for the output tubes. Never replace it with any other fuse than a 0.5 amp fast blow! 0.5A @ 250 volt rating.

CAUTION

NEVER REMOVE or THE INSERT AC LINE CORD WHEN THE UNIT IS ON TO

AVOID RISK OF ELECTRICAL SHOCK

1.5 TOP PANEL FEATURES

TRIODE / ULTRA-LINEAR SWITCHES: Three mode switches per chassis side allow you to choose from 50 watts (100 watts mono) power in Triode mode or 100 watts (200 watts mono) power in Ultralinear mode. All mode switches should be set to the same ‘direction.’

RED LED: (‘Good Health LED’) Indicator for each individual output tube. When the LED is lit it shows that the associated output tube is working.

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Cary Audio Design CAD-280SA operation manual Front Panel Features, Rear Apron Features, TOP Panel Features

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.