Pioneer SA 8100 Owners Manual

Page 2

Your new Pioneer stereo amplifier, model SA-BTOO, in-
corporates numerous breakthroughs in circuit design and
will serve as the heart of a hirfi stereo system to satisfy
even the most discriminating demands To make full use of
this unit's many features, please study the following instruc-
tions carefully.

FEATURES .

Balanced (+j And i ) Power Supply in All
Amplifier Stages '

Differential amplifier circuits are employed in the equalizer,
tone control and power amplifier sections, and power sup-
ply to all amplification stages is of the balanced (+) and (7)
type. This design gives stable DC potential balance - vital
for speaker protection and unfluctuating performance -
and prevents the generation of switching noises.

Constant-(Zurrent Circuit Solves Problem Of
Conventional Transistor Amplifiers

All stages of the power amplifier are direct coupled, the
output stage is a pure complementary OCL circuit. This is
the revolutionary constant-current circuit keeps transistor
characteristics stable regardless of input signal level. With
its high-gain and generous application of negative feedback,
this amplifier shows excellent transient characteristics and
minimum distortion. Continuous rated lHF output power,
with both channels driven, is 40W + 40W at 0.3% total
harmonic distortion,

Phono Equalization Adheres Strictly To RlAA
Curve

The use of strictly selected nichrome processed metal-film
resistors and styrol capacitors in the NFB circuit enables the
phono equalizer amp to operate within i0.2dB of the
standard RIAA curve, over the whole swing from 30 to
15,000 Hz. Records sound, in other words, exactly as the
recording engineers intended them to sound. Furthermore,
a relatively high supply voltage and large input handling
ability result in a wide dynamic range,

Unique Twin Tone Controls For Flexible
Adiustment Of Frequency Response

There are a total of four tone controls 7 two for the bass,
two for the treble range. Working frequencies of the bass
controls are 50Hz and lOOHz, those for the treble controls
are lOkHz and 20kHz. Practically any desired frequency
response curve can be obtained, to compensate for the
particular characteristics of the phono cartridge, the room,
or personal listening preferences, A tone defeat" switch
removed the tone controls from the circuit, providing flat
response for measurement purposes, etc.

ilesetting of Volume Range

Where the full maximum volume is never needed 7 with
speakers of insufficient power handling ability, for example
- the maximum volume level can be pre-set at -lSdB or
e30dB. The volume control knob then covers the reduced
range, permitting finer adjustments.

Perfect Electronic Protection Of Speakers,
Output. Transistors

Speakers are protected from accidental damage in three
ways: by the accurate control of DC potential at the amp
outputs; by the above-mentioned possibility to limit maxi-
mum power; and by an electronic protection circuit that
shuts off the output circuit at the first sign of trouble
such as a short-circuit in the speaker leads,

Auxiliary Controls Anti Circuits Give Great
Flexibility

Preset level controls are provided for the phono 2 and aux
2 inputs, Two sets of tape inputs and outputs with cor-
responding monitor switches permit easy tape-to-tape
duplicating. A two-position (8H2, 30Hz) low filter and
a SkHz high filter are effective in controlling noise prob
lems. Two pairs of speakers can be driven separately or at
the same time. An audio muting switch reduces the listening
volume instantly by ZOdB. The loudness switch gives more
natural-sounding frequency contours at low volume levels,

Elegant Styling Matches Technical Excellence
The functional layout of the control panel is as practical
as it is beautiful, The natural walnut cabinet provides pro
tection and adds decorator looks. Combination with other
Pioneer hi-fi components will result in a music system of
well-matched beauty in sound and appearance.

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