Pioneer c 21 owners manual

Page 1

STEREO PREAMPLIFIER

C-E'I

OPERATING INSTRUCTIONS

KU

IMPORTANT NOTICE

The serial number for this equipment is

located on the rear panel. Please write
this serial number on your enclosed war-

ranty card and keep in a secure area.
This is for your security. 1

WARNING: TO PREVENT FIRE 0R SHOCK HAZARD,
DO NOT EXPOSE THIS APPLIANCE TO RAIN 0R
MOISTURE.

llllllllll

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The C-21 is a stereo preamplifier composed of
an equalizer amplifier and a flat amplifier and
designed to display the ultimate in sound
quality. It is a streamlined model and so does
not feature a tone control circuit or accessory
circuitry. Please read this instruction manual
through carefully before using your 021 so
that you derive the most from your program
sources in reproduction fidelity.

CONTENTS
Features .......................... 2
Configuration of the Stereo System ..... 3
Installation Precautions .............. 3
Connection Diagram ................. 4
Connections ....................... 5
Names and Uses of the Controls ........ 6
Before Listning to a Program Source . . . '7
Operation ......................... 7
Using the Tape Decks ................ 8
Other Applications .................. 9
Characteristics Charts ................ 1 1
Specifications ...................... 12

FEATURES

Equalizer Circuit for Faithful Record
Reproduction

The equalizer amplifier consists of a differential amplifier
which employs low-noise p-n-p transistors for the first
stage, and another differential amplifier with a current
mirror circuit for the second stage. Together, they improve
the efficiency of the line voltage and the linearity. The
output stage is a Class-A pure complementary SEPP circuit
which provides a broad dynamic range and a low output
impedance. This circuit eliminates distortion, even with
high-output cartridges and high peak input music sources,
and it features a smooth combination with the next stage.
Ultra-precision metal film resistors (0.5% error) and
polypropylene capacitors (1% error) with excellent temper-

ature characteristics are used in combination as the
equalizer elements and they keep the deviation down to

between 20Hz and 20kHz (10.2dB).

The phono circuit is provided with a subsonic filter which
attenuates frequencies less than lSHz by 6dB/oct. This
ensures that ultra-Iow-frequency noise, intermodulation
distortion and factors which might damage the speakers
are all eliminated.

Flat Amplifier with Excellent Frequency Response

The flat amplifier incorporates a differential amplifier for
the first stage, a differential amplifier with a current mirror
circuit for the second stage, and the output stage is a
Class-A pure complementary SEPP circuit. lts configuration
is practically identical to that of the equalizer amplifier and
so it too displays a broad dynamic range and an unbeatable
frequency response. It improves the S/N ratio, distortion
and other characteristics without a tone control circuit or
filter circuitry.

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2

Phono Circuit with Selectable Input Resistance and
Input Capacitance

The phono input circuit provides the optimum input
resistance and capacitance, according to the characteristics
of the cartridge. There are selector switches for the input
resistance (lOO/lOk/25k/50k/75k/100k ohms) and for the
load capacitance (100/150/200/300/400/500pF). These
switches allow you to select load impedances and load
capacitances other than those specified, even if you have
just the one cartridge, and so you can enjoy subtle changes
in the sound quality. The CARTRIDGE LOAD impedance
switch has a lOOohm setting which permits the S/N ratio to
be further improved for more enjoyable record reproduc-
tion when you use a high-output moving coil cartridge.

Highly Dependable Volume Control

The volume control features an attenuator with 32 differ-
ent settings. It is extremely reliable and so you can adjust
the volume accurately. Also included are two gain controls
which can be used to adjust the C-21s output levels for
both channels within a t6dB range, according to the input
sensitivity of the power amplifier.

Attractive and Practical Design

All the controls are mounted on the front panel. The
controls are very easy to handle and the switches respond
lightly to the touch. The panel itself has a slim design.

All in all, this is a new preamplifier which opens up a new
dimension in sound. As such, it is a pioneer among hi-fi
components.