Pioneer spec 1 owners manual

Page 1

STEREO P RE-AM PLIFIER

SPEC-1

OPERATING lNSTRUCTlONS

g.

l-

SPEC-1 is designed to operate fr0m 120V, 220V or 240V main.
Before turning on the power, please confirm the line voltage set-
ting indicated on the side of your unit corresponds to the supply
voltage in your area; if not, change the setting as described in

i

IMPORTANT-LINE VOLTAGE on page 16.

j..,.__..._._

1

~_..._.._

i

I

I

t

Page 2

Features

. Stereo System Set-up .................. 3
Connection Diagram ................... 4
Connections ........................ 5
Speaker Systems ...................... 8
Front Panel Facilities .................. 8
Before Operating ...................... 10
Basic Operation ...................... 10

CONTENTS

Using Microphone ..................... 11
Using Tape Decks ..................... 12
Effective Operation .................... 1 3
Conditions Frequently Mistaken for

Malfunction ....................... 15
Important-Line Voltage ................ 16

Specifications. SPEC-l Characteristics,
Installing in Rock and Circuit Diagram
Diagram ...................... Insertion

FEATURES

Circuitry Composed for Outstanding DC Balance

Differential amplifier circuitry is incorporated in the
equalization and tone control amplifiers. This is comple-
mented by a dual positive and negative power supply
system for all amplifier sections, which provides improved
DC balance and stability. while eliminating click noises due
to switching. An electronic muting circuit, employing a
reed relay, blocks surge noise associated with power switch
operation.

Close Tolerance RIAA Equalization

Ultra precision grade vapor deposited metallized film
resistors (11% tolerance) and styrol capacitors (12%
tolerance) are combined in the NF 8 elements to suppress
RIAA deviation to £0.2dB in the 30Hz to IS,000HZ
frequency band. High stability at low frequencies is also
promoted by the differential amplifier first stage, three
stage direct coupled Class A SEPP circuit design. The
dual polarity power supply system greatly increases the
acceptable input level. This allows high output phono
cartridges to be used and even vigorous record passages to
be enioyed with negligible distortion.

Precision Tone Control Facilities

Developed by Pioneer, the twin tone control circuit
provides independent ultra~low and ultra-high subcontrols
in 'addition to conventional bass and treble controls.
Extremely delicate tone adjustments are made possible
which can be used to compensate for listening room
acoustics and frequency response characteristics of the
speaker systems and phono cartridge. A convenient TONE
switch is also included for bypassing the tone control
circuits to obtain a flat frequency response whenever
desired. This feature is useful for evaluating tone control
effectiveness.

Built-in Microphone Mixing Circuit

A microphone mixing circuit is included together with a
control for adiusting the volume ratio between microphone
and program sources. Versatility is thus broadened to such
applications as live explanations during record concerts,

2

paging when records or tapes are being used for background
music in coffee shops or similar relaxed mood establish-
ments, and live singing with a previously recorded
melody.

Pro-amplifier Equipped with Speaker Selector

The speaker system outputs of a power amplifier can be
routed through the SPEC-l, then from the SPEC-l to the
speaker systems. If two sets of stereo speaker systems are
connected in this manner, each set can then be selected
individually or simultaneously by an easily operated front
panel switch. The SPEC-l is truly an audio control center
that meets the demands of discriminating high fidelity
enthusiasts for new and high quality equipment.

Convenient Operating Functions

PHONO 2 LEVEL Control: Input sensitivity at the
PHONO 2 iacks can be adjusted from 2.5mV to lOmV
(MB to -l2dB). This permits a turntable with a high
output phono cartridge to be connected and its level
adiusted to match that of other program sources.

VOLUME Control and ATTENUATOR Switch: The
VOLUME control is actually a precision attenuator, with
coarse attenuations of ~lSdB and -30dB selectable by a
separate ATTENUATOR switch. Volume adjustment when
listening at low sound levels or employing a high gain
power amplifier are then easily performed.

TAPE DUPLICATE Switch: By connecting two tapc decks,
the desired programs from a previously recorded tape can
be edited onto a second tape, or converted from open reel
to convenient cassettes.

Professional Front Panel Design

The wide front panel has been designed for the operational
convenience appropriate to high grade system equipment.
In addition to lending an impressive appearance in a
conventional audio equipment cabinet, the SPEC-l can
also be directly mounted in an EIA standard rack.