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FUNCTION
1.Output indicator
2. Power switch
3. Volume control
4. Input select
5. Input jacks (red / black)
6. Speaker connector
7. Power plug
8. Serial number
9. Fuse
WHAT TO DO IF ...
Power indicator and filaments do not light:
Check the fuse and make sure the amplifier is plugged
into a working power outlet.
Sound out of one speaker only:
Turn volume control fully counter-clockwise and
reverse input connectors. If sound changes from one
speaker to the other, check preamplifier, source or
replace interconnect wires. If the sound is still coming
out of the same speaker only, check speakers on
another piece of equipment for proper operation.
THEORY OF OPERATION
T h e R E F E R E N C E 8 8 0 i s a p u s h - p u l l C l a s s A
integrated amplifier ,6550 output power tubes per
channel. It uses little global feedback. Signal goes first
to the 12AT7 dual triode acted as input stage, then to
the12AU7 dual triodes acted as double drive stage.
The 5687 drive the 6550 output tubes which are
transformer-coupled to the load (In this case, the
speaker.).
TECHNICAL SPECIFICATION
CONTROL FUNCTIONS: Power On/Off
POWER OUTPUT: 70 watt x 2, RMS 1kHz ( Ultra-linear )
TOTAL HARMONIC DISTORTION: less than 1%( 30watt, 1kHz )
FREQUENCY RESPONSE: ( -3dB points at 50 watt ) 6Hz-100kHz
INPUT SENSITIVITY: 280mV
INPUT IMPEDANCE: 100k ohms
OUTPUT IMPEDANCE: 4, 8 ohms. ( User selectable )
SIGNAL/NOISE: 86dB
CONSUMPTION: 190watt
INPUT INTERFACES: 4 group ( RCA )
OVERALL NEGATIVE FEEDBACK: Little
VACUUM TUBE: 6550EH x 8, 5687x 2, 12AU7 x2,12AT7x1,6E2x1
DIMENSIONS: 412(L) x 220(W) x 166(H) mm
WEIGHT: 30kg x 2
SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE.
power
1
2
3
4
input
OUTPUT
INPUT
a
u
d
i
o
8
4
0
4
3
5
5
Reference 880
volume
AC IN
OUTPUT
0
4
8
OPERA AUDIO PRODUCT
2
1
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