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CONNECTING COMPONENTS
Connect all necessary audio components to the
rear panel of the unit, using RCA pin cords. See
the illustration for properly completed con¬
nections. When connecting RCA pin cords, be
sure that L (left) and R (right) markings on
each component are matched correctly. Con¬
nect the grounding wire of the turntable to the
terminal marked GND on the amplifier.
Note 1: The rear panel of the unit is provided
with the phono cartridge load selector, yvnich
allows selection of load capacitance,in three
steps,
lOOpF, 200pF, and 300pF. Use this
selector to optimize the perfocmance of your
cartridge. See your cartridge specification sheet,
and set the selector to the position closest to
the specified value, if load capacitance is not
specified on your cartridge, set the selector to
300pF position. Generally, as the capacitance is
decreased from 300pF to 200pF, or from
200pF to lOOpF, high notes are emphasized.
Note 2:
In addition to the PHONO, C.D.,
TUNER, TAPE 1, and TAPE 2 input terminals,
the rear panel of the RA-870 has PRE OUT and
MAIN IN terminals. The PRE OUT terminals
supply signal from the preamplifier section of
the RA-870 to a separate power amplifier,
allowing the unit to be used as a stereo pre¬
amplifier. The MAIN IN terminals are input
terminals for the unit's main amplifier section,
allowing the unit to be used as a stereo power
amplifier when it is connected with a separate
preamplifier.
When the RA-870 is combined with ROTEL
RB-870 power amplifier in bridged connection
(BTL), the main amplifier section of the
RA-870 will operate as a monaural power
amplifier to drive one channel only. Whereas
the RB-870 works as a monaural amplifier to
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drive another channel. In the bridged operation,
power-output capability of each unit will be
greater than twice the single-unit rating. If you
wish to use the PRE OUT and MAIN IN ter¬
minals for purposes mentioned above, set the
NORMAL-BRIDGED/SEPARATE selector lo¬
cated above these terminals to BRIDGED/
SEPARATE position. If you use the unit as a
normal
stereo
integrated amplifier, set the
selector to NORMAL position, so that the
internal
preamplifier section and the main
amplifier section are combined.
SWITCHES AND CONTROLS
(1) Power Button
Depress this button to turn on the power in the
unit. Press the button a second time to release
it and to cut off the power.
(2) Headphone Jack
For private listening, plug your headphones
into this jack, which cuts off the sound from
speakers. The volume of the headphone sound
can be regulated with the volume control.
(3) Power Indicator
Glows when power is turned on with the power
button.
(4) Bridged Mono Indicator
Glows when the NORMAL-BRIDGED/SEPA¬
RATE selector provided on the rear panel is set
to BRIDGED/SEPARATE position for separate
use of unit's preamplifier and main amplifier
sections.
(5) Protection Indicator
Glows when the built-in protection circuit is
activated. The indicator normally lights for
several seconds upon turning on the power, or
upon switching the Phono MM/MC selector.
When the indicator goes off, it means the unit is
in the normal operating state.
The indicator also glows when abnormally high
temperature is built up inside the unit due to
low-impedance drive, etc. In such a case, the
indicator will remain on until the temperature
in the main amplifier section drops to a normal
level. When the indicator goes off, it indicates
the unit has returned to the normal operating
state.
(6) Volume Control
Used to regulate the volume level. Turn clock¬
wise to increase the volume, and counter¬
clockwise to reduce it. This is a dual con¬
centric knob which permits either separate or
combined adjustment of both channels.
(7) Mode Selector
Used to select the reproducing mode of the
stereo signal fed into the preamplifier section of
the unit. STEREO position is for normal stereo
reproduction, MONO position for monophonic
reproduction,
and
REVERSE
position
for
reproduction with left and right channel sounds
reversed.
(8) Tape Monitor Selector
Used to listen to signal supplied from tape
deck. Set the selector to TAPE 1 position for
the signal from a tape deck connected to TAPE
1 terminals on the rear panel, and set to TAPE
2
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