Cary Audio Design CAD-280SA User Manual
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.
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 read this manual carefully before putting your new
V-12R in operation. The following definitions are applicable. Warnings should be
followed explicitly.
1.2 Specifications
The CAD-280 SA V-12R or V-12R Monobloc version basic specifications:
DIMENSIONS: 9’’H x 12 _’’W x 20’’D
WEIGHT: 68-lb. stereo or 85-lb. for the Monobloc version
CIRCUIT TYPE: Push-Pull Triode or Ultra-linear Amplification in Pure Class A
POWER OUTPUT: 50 watts – Triode Mode 100 watts – Triode (Mono)
100 watts – Ultralinear Mode 200 watts – Ultralinear (Mono)
INPUT SENSITIVITY: 1.3 volts for full output
INPUT IMPEDANCE: 150,000 ohms
NOISE AND HUM: > 84db below rated output
FREQUENCY RESPONSE: 20Hz to 23Khz +/- 1.0 dB (at full power)
TUBES: 2- 12BZ7 Input tubes (or 12AY7, 12AX7)
2- EL-84 Current Source tubes (or 6BQ5)
12- EL-34 Output tubes (or 6550, KT-66, KT-77, KT-88, KT90, 6L6)
POWER TRANSFORMER: 1- EI laminated, 200% duty cycle
OUTPUT TRANSFORMERS: 2-EI laminated stereo (1-EI mono) Silicon Impregnated
RESISTORS: 1.0% tolerance, precision metal film resistors
CAPACITORS: Oil Filled
POWER SUPPLY CAPACITORS: 4 - 560 MFD @ 400 volts
AC CORD: 3 conductor shielded detachable
AC POWER REQUIREMENTS: 117/234 volts AC 50/60Hz
POWER CONSUMPTION: 420 watts in operation, 10 watts in stand-by
WARM-UP TIME: 3 minutes
BREAK-IN PERIOD: 100 hours of music playing time
FINISH: Jaguar Carnival Red paint on chassis
FRONT PANEL: Machined, Black Anodized aluminum
Specifications are subject to improvement without notice or obligation.
WARNING
HAZARD PRESENTS PERSONAL INJURY OR DEATH
Caution
EQUIPMENT DAMAGE MAY OCCUR BUT NOT PERSONAL INJURY
Note
Proper performance of the amplifier cannot be ensured
if disregarded
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.
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.
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.
CAUTION
EQUIPMENT DAMAGE MAY OCCUR WITH IMPROPER RATED FUSES
CAUTION
NEVER REMOVE or THE INSERT AC LINE CORD WHEN THE UNIT IS ON TO
AVOID RISK OF ELECTRICAL SHOCK
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