Cary Audio Design CAD-280SA user manual

Summary of the content on the page No. 1

Cary Audio Design
CAD-280SA
V-12R
Vacuum Tube Stereo or
Monobloc Power Amplifiers
OPERATION MANUAL
NOTE: Before installing your new V-12R power amplifier, please read this manual carefully as it will
inform you of the specifications, proper installation procedures and operation procedures. Also included
in this manual are guidelines on how to properly service and care for your new CAD-280 SA (V-12R)
stereo or mono power amplifier.

Summary of the content on the page No. 2

Specifications for your newV-12R power amplifier. We have updated the V-12 mono and stereo models to a RACING (R) version! The new racing input circuit makes the input sensitivity 1.2 volts, similar to most components currently available. Operating the power amplifier is a simple procedure. Each unit is designed for long term stability in virtually any home operating situation. Please note, if the unit is operated outside the parameters outlined in this owner's manual, damage may result. Please

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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 interconne

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WARNING! MAKE NO ATTEMPT TO PUT THE CAD-280 SA AMPLIFIER IN SERVICE WITHOUT THE BOTTOM PLATE ATTACHED - CONTACT WITH HIGH VOLTAGE INSIDE THE CHASSIS CAN BE FATAL! INSTALLATION This section describes the unpacking and installation procedures for the CAD-280 SA amplifier. 2.1 Unpacking All shipping containers have been specifically 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

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The speaker cables from the output posts of the CAD-280 SA to the speaker system can be any convenient length your set-up requires. Select speaker cables of sufficient

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size to preserve the outstanding performance capabilities of your power amplifier. Heavy gauge #14 wire is suitable for distances up to 15 feet, #12 wire for up to 30 feet. Your Authorized Cary Audio Dealer will have proper speaker cable in stock for this purpose. Signal input connection is made via the input jack(s) on the rear of the CAD-280 SA. The interconnect cable(s) from the output of a variable output CD player or preamplifier can be any convenient length your set-up requires. The choice

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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. WARNING MAKE SURE AMPLIFIER IS UNPLUGGED FROM

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WARNING! MAKE NO ATTEMPT TO PUT THE CAD-280 SA IN SERVICE WITH THE BOTTOM PLATE REMOVED. CONTACT WITH THE HIGH VOLTAGES FOUND INSIDE THE CHASSIS 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. CAUTION NEVER REMOVE OR INSERT AC PLUG WHEN THE UNIT IS ON OR THE AC POWER SWITCH IS IN THE ON POSITION. OBSTRUCTION OF THE TOP