Equipment information:

Pioneer A-9 Amplifier
Manufacturer:
Pioneer
Model: A-9
Date:
Category: Audio, Video, TV, Multimedia
Group: Amplifier
Description: Non Switching Amp, Stereo Amplifier
Information:
                                    NON SWITCHING AMP for Power amplifier
The power amplifier section adopts a Non-Switching Amplifier
system which combines the merits of the class A amplifier's
high quality and the class B amplifier's high efficiency for a
Continuous power output of 110 watts* per channel, min., at
8 ohms from 20 Hertz to 20,000 Hertz with no more than
0.003% total harmonic distortion.
The voltage amplification stage features two current
detector circuits to control the bias circuit voltage and
prevent the current flowing to the power transistors from
being cut off. As a result of these innovations, the
distortion generated when the transistors are switched is
suppressed, the dynamic distortion is improved and the sound
takes on an extra dimension in clarity extended to the
high-frequency range.
Power amplifier, Equalizer amplifier with DC servo circuit
A DC servo circuit using an operational amplifier is used
for the equalizer amplifier and power amplifier. By making
use of this circuit, it has been possible to eliminate the
coupling capacitors, which cause coloration in the sound
quality, and to configure a direct-coupled circuit from the
PHONO MM inputs through the outputs. As a result, virtually
distortion-free sound reproduction is ensured across a wide
frequency spectrum from the ultra-low range to the
ultra-high range.
Line Straight Switch Provided
This unit comes with a unique line straight switch which can
be flipped to allow the signals to bypass the tone control
circuit, balance volume and mode switch. It is thus easy to
provide a simple circuit configuration—something which is
extremely important as far as the purity of the sound heard
is concerned.
High signal-to-noise ratio MC amplifier
The MC amplifier adopted uses low-noise and high-
performance in the input to yield an input sensitivity of
100 μ/, a maximum allowable input of 10 mV (1 kHz, 0.002%
THD) and a high signal-to-noise ratio of 72 dB. This ensures
that the most is made of the high performance of MC
cartridges—even low-output models.
MM Equalizer With High S/N Ratio
The equalizer amplifier is provided with a first stage
differential input and ICL configuration, and it employs
rigorously screened resistor and capacitor elements to
realize a phono signal-to- noise ratio of 90 dB with an MM
cartridge·(IHF-A) as well as an RIAA deviation of ± 0.2 dB
over 20 to 20,000 hertz. The maximum allowable input, at 250
mV for an MM cartridge (1 kHz,
0.002% THD) is more than enough for the best sound quality,
enabling virtually distortion-free record play even with
music characterized by high peaks.
Recording Selector Switch/Indicator Featured
This switch allows you to record another program source onto
a tape in your tape deck even while you are listening to the
source which you have selected with the FUNCTION switch. The
indicator tells you exactly what is being recorded and what
is being played at a glance.
Load Capacitance Selector Switch
The cartridge load capacitance switch (100 pF, 200 pF, 300
pF, 400 pF) brings out the best in the performance of your
MM cartridge. It also allows the characteristics of the
cartridge to be varied and the sound aligned with your
personal preference.
Load Impedance Selector Switch for MC Cartridges
This load impedance selector switch (high 100 Ω, low 33 Ω),
designed only for MC cartridges, does full justice to the
delicate nuances in sound which are reproduced by the MC
cartridge.
Pictographic Input/Output Display
By using pictographs for the function position and speaker
output display, operational ease is enhanced and the
operational mode of the tone controls in the signal path is
indicated.
Protection Indicator
As soon as the protection circuit is actuated to protect the
amplifier from damage when the speaker terminals have been
shortcircuited in error or as soon as the muting circuit,
which functions to prevent the unpleasant noise heard when
the power is switched on and off, is made operational, the
speaker output is cut off and indication is made by this red
protection indicator lamp. The lamp changes over to green
once the amplifier is operating normally again.
Subsonic Detection Indicator
If too many noise components arise in the ultra-low
frequency range due to warp and other deformation in the
record being played, they will have an adverse effect on the
quality of the sound reproduced. Although they cannot be
heard directly by the ear, the subsonic detection indicator
lights up when the components are detected to warn the
operator of the problem.
LED Power Meter
The output level meter employs a 12-point LED with a fast
response to give an accurate indication of the output peaks.
In addition, the furthermost LED lights up red as an easily
distinguishable warning that the output signals are being
clipped.
Attractively Styled Group Display Panel Design
All the function switches and volume control which are used
regularly are positioned on the right while all the
sub-controls which are usually set up and then left without
further adjustment are housed behind a movable panel at the
left. All the indicators that show the signal flow, output
level and other modes of operation at a glance are housed on
a panel in the center of the unit

These manuals are available for the above equipment:

Pioneer -- A-9 -- User Manual
File name: Pioneer-7215-Manual-Page-1-Picture
Manual Type: User Manual
Pages: 16
Size: 1.13 Mbytes (1182968 Bytes)
Language: english
Revision:
Manual-ID/Number:
Date:
Quality: Scanned document, all readable.
Upload date:
MD5: 7d8310c4848e06737a36a62fe4076318
ed2kID: 1e6093a14822fb68593b47d4b962e05e
Downloads: 37 since 27 September 2015
Information:
Line Voltage Variations..................................... 2
Features
............................................................. 3
Rear Panel Description ..................................... 4
Connection Diagram............................................4
Connecting the Components .............................5
Front Panel
Facilities............................................7
Operations
.........................................................10
Using the Tape Decks.......................................11
Effective
Uses.....................................................12
Troubleshooting.................................................14
Specifications.....................................................15
Precautions when Moving and
Installing the
Unit...............................................16
Pioneer-7215-Manual-Page-1-Picture
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