Pioneer SA-708 Betriebsanleitung - Seite 2

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Stereo System Composition

..............

Installation Precautions................6.

Rear Panel Facilities ..................-.-

CONnKECTIONS o:.2.ae hbk,

SESS EASES

FEATURES

DC Power Amplifier with High S/N and Low Dis-

tortion

This is a DC configuration power amplifier which uses

superlinear transistors with excellent high-range switching

characteristics

for the power transistors. The result is a

Continuous

Power Output of 65 watts"

per

channel,

min., at 8 ohms

from 20 Hertz to

20,000 Hertz

with no

than

0.02 %

total harmonic distortion or

65 watts

per

channel at 4 ohms from 20 Hertz to

20,000

Hertz

with

no more

than 0.03% _ total

harmonic distortion.

The power amplifier circuit board features a heat sink

partition to separate the small-signal class A amplifier sec-

tion and the output stage class B amplifier section and

power

supplies. This prevents

interference

between

the

small-signal and large-signal sections. Furthermore, the heat

sink is lightweight and has a T-shaped "skyve'' construction

for an effective heat dissipation capability. This feature

keeps the rise in the temperature down and it ensures that a

high-quality sound is provided.

Equalizer Amplifier with a High S/N and Low Dis-

torsion

The 3-stage direct-coupling with three low-noise tran-

sistors is a design which brings out the best in the final-stage

emitter follower equalizer amplifier. All the various com-

ponents that are used for the equalizer elements help pro-

vide a PHONO

signal-to-noise ratio of 86dB (IHF-A), an

RIAA deviation of +0.2dB (20Hz to 20,000Hz), and a

phono overload level of 200mV (1kHz, T.H.D 0.01%) for

the high-fidelity re-creation of sound from records.

Highly Reliable Protection Circuits

There are protection circuits which serve to detect over-

load and the mid-point voltage in the power amplifier stage.

When the speaker terminals are shorted or something unex-

pected happens that causes the mid-point voltage-to under-

go an abnormat change, the circuits use a relay to immedi-

ately cut the power amplifier off from the speakers. They

- also function as a muting circuit when the power switch is

Operations :.4.25 465.665 Cee ee

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Using the Tape Decks ..................

Conditions Frequently Mistaken for

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Specifications ...........2+.0000-

Schematic Diagram ...............

set to the ON and OFF positions to suppress the undesira-

ble noise which is generated and to safeguard the speakers

from damage.

Power Level Indicator with Fluorescent Display

Used for the power level indicator are two fluorescent

displays (one for the left channel and the other for the

right) which feature a very fast response speed to indicate

the power level virtually instantaneously. This indicator is

composed

of highly

dependable

ICs and its logarithmic

compression and drive circuits make it possible for a wide

range of power levels from 0.003W right up to the maxi-

mum levels to be indicated for both the left and right chan-

nels independently without switching knobs or levers.

Rich Store of Accessory Functions

e@ The phono interference filter switch serves to reduce the

radio-frequency interference from external electronic or

electrical appliances or produces during record play.

e The subsonic filter switch serves to cut out the low-

frequency noise, which is harmful to your speakers, ge-

nerated by record warp.

e@ The loudness switch compensates for the deficiencies of

the human

ear with respect to low-frequency and high-

frequency sound and it is also useful when listening to

programs at night, for instance, with the sound turned

down.

e@ The tone switch is a convenient control for checking the

efficacy of the two tone controls.

e The function indicators tell you the program source at a

glance.

@ The amplifier is also equipped with two sets of tape deck

jacks for connecting two tape decks. The tape monitor

switches can be used to dub tapes from TAPE 1 deck to

TAPE 2 deck and for simple tape editing.

e MODE switch can be used to select between stereo and

mono modes. It is effective in adjusting the balance be-

tween the left and right channels.

e MUTING switch can be used to momentarily reduce the

volume level, or alternatively, you can use it to adjust

the volume subtly in combination with the volume con-

trol knob.

* Measured pursuant

to the Federanl Trade Commision's

Trade

Regulation

rule

Power

Output

Claims

for

Amplifiers.