Pioneer SA 8500 Mk2 Owners Manual

Page 1

; STEREO AMPLIFIER

A-BEDDII

OPERATING INSTRUCTIONS,

SA-8SOOII are designed to operate 220V or 240V (HG model) main and
110V, 120V, 220V or 240V (S model) main. Before turning on the power,
please confirm the line voltage setting indicated on the rear of your unit
corresponds to the supply voltage in your area; if not, change the setting as

@IDIONEERW , described in IMPORTANT'LINE VOLTAGE on page 16.

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FEATURES

Designed for Power to Spare

Advanced DC stability and high gain are realized in the
power amplifier by incorporating a dual plus-minus power
supply, a lst stage differential amplifier and a current
mirror type differential amplifier in the predriver stage.
Negative feedback is applied in an optimum design for
minimized distortion. New type power transistors in the
output stage form a parallel push-pull composition in a
purely complementary OCL circuit.

Continuous power output is .60 watts* per chan-
nel min. RMS, at 8 ohms or 75 watts* per chan-
nel at 4 0th from 20 Hertz to 20,000 Hertz

with no more than 0.1%total harmonic distortion.
Ample reserve power becomes available with low distortion.
Chimney type heatsinks are also employed which focus
the generated heat to increase thermal dissipating effi-
ciency.

High Stability Twin Transformer Power Supply
Superb regulation and stability are achieved by the massive
twin power transformer design that in essence combines
two monaural amplifiers to-form symmetrical left and right
channel amplifiers. The dual plus-minus power supply
system also incorporates four large 10,000 microfarad
electrolytic capacitors, providing greater stamina in this
important section. Low frequency reproduction becomes
clear and distinct. The preamplifier section also includes a
carefully engineered voltage regulator circuit and balanced
positive and negative power supply, assuring low distortion
from low to high output levels.

Class A SEPP Equalizer Section

Low noise PNP transistor differential amplifier lst stage
and class A purely complementary SEPP final stage are
featured in the three stage direct coupled equalizer circuit.
At 125V power supply voltage, the maximum phono input
(at lkHz) is more than 250mVrms providing plenty of
dynamic margin. Stringent standards for the high precision
circuit elements contribute to holding the RIAA deviation

to within i0.2dB in the range from 20Hz to 20,000Hz.
The extremely flat response enables accurate reproduction
of delicate program source material.

Protection/Muting Circuit for both Reliability and
Listening Ease

Valuable speaker systems and semiconductors are protected -
against damage in event of speaker terminal shorting or the
appearance of DC current at the output terminals. If these
types of malfunctions occur, the relay type protection
circuit immediately opens the output circuit, thus prevent-
ing further damage. The circuit also performs a muting
function to prevent noise bursts when the power switch is
operated on»off.

PHONO Input Circuit with Selectable Load
Capacitance

An input capacitance switch allows optimum matching of
the phono l and 2 circuits to the cartridge output charac-
teristics. Various types of responses can also be obtained
from a single cartridge by varying the input capacitance
with the input capacitance switch to provide differences in
playback sound quality.

Selectable Turnover Tone Controls

In addition to the familiar bass and treble controls, turn
over switches are provided which can be used to select the
point where the tone controls take effect. Precise tone
adjustments become possible according to listening room
acoustics, phono cartridge and speaker system frequency
characteristics and other objectives Since a tone defeat
switch is also included, a flat frequency response can be
obtained when desired to allow listening comparisons of
various tone control settings.

Convenient DUPLICATE Switch for Tape Dubbing
Two tape decks can be connected and dubbing performed
in either direction (from tape 1 to tape 2, or from tape 2 to
tape 1). Simple switch selection permits extremely conven-
ient tape duplication and program editing.

Features ............................ 2
Stereo System Composition ............. 3
Installation Cautions .................. 3
Connection Diagram ................... 4
Connections ......................... 5
Front Panel Facilities .................. 6
Before Operation ..................... 8
Operation ........................... 8

CONTENTS

Effective Operation ................... 9
Tape Deck Connections ........... . . . 10
Using Tape Deck ..................... 1 1

Employing Pre Out and Power In Jacks . . . . 12
Conditions Frequently Mistaken for

Malfunction ....................... 13
Specifications ........................ 14
Important - Line Voltage ............... 16

E * Measured pursuant to Federal Trade Commission 3 Trade Regulation rule on Power Output Claims forAmplifiers.