Pioneer SA 9500 II Owners Manual

Page 1

STEREO AMPLIFIER

'SA-SEDDII

OPERATING INSTRUCTIONS

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FEATURES

Designed for Power to Spare

Advanced DC stability and high gain are reali7ed in the
power amplifier by incorporating a dual plus-minus power
supply, a ist 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 of 80 watts per chan-
nel. min. RMS, at 80th from 20Hertz to 20,000
Hertz with no more than 0.05% total harmonic
distortion. or 100 watts per channel at 4 0th
from 20 Hertz to 20,000 Hertz with no more
then 0.1% total harmonic distortion.

Ample reserve power becomes available with low distortion.
Chimney type hualsinks are also employed which focus
the generated heat to increase thermal dissipating efli-
ciuncy.

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 12,000 microlarad
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 lcvcls.

Class A SEPP Equalizer Section

Low noise PNP transistor differential amplifier ist stage
and class A purely complementary SEPP final stage are
featured in the three stage direct coupled equalizer circuit.
At i30V poWer supply voltage, the maximum phono input
(at ikHL) is more than 3DOmVrms providing plenty of
dynamic margin. Stringent standards for the high precision

circuit elements contribute to holding the RIAA deviation

to within 10.2613 in the range from 20Hz to 20.00tng

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 mallunctions 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
Impedance

Separate switches for input resistance and input capacitance
allow optimum matching of the phono l and 2 circuits to
the cartridge output characteristics. Various types of
responses can also be obtained from a single cartridge by
varying the input impedance with the input resistance and
capacitance switches to provide subtle differences in play-
back sound quality.

Original Twin Tone Control Design

Conventional bass and treble controls are complemented by
additional sub controls for adjusting ultra low and ultra
high frequencies. This original Pioneer innovation lets you
perform highly precise tone adjustments according to
listening room acoustics and frequency characteristics of
phono cartridge and speaker systems. A tone defeat switch
is included so that a flat response can be instantly obtained
in order to compare tone control effectiveness or perform
other operations.

Convenient DUPLICATE Switch for Tape Dubbing
Two tape docks can be connected and clubbing 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
Front Panel Facilities .................. 6
Before Operation ..................... 8
Operation ........................... 8

CONTENTS

Effective Operation ................... 9
Tape Deck Connections ................ 11
Using Tape Deck ..................... 1 1
Employing Pre out and Power In Jacks . . . . 12
Specifications ........................ 14

Conditions Frequently Mistaken
for Malfunction ................... 16

2 ' Meairured pursuant to Federal Trade Commission's Trade Regulation rule on Power Output Claims for Amplifiers.