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| Pioneer C-90 |
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| 170,000yen(1986 release) |
Stereo control amplifier
which aimed at the review from the origin of amplifier and was developed as the
compilation.
The basis of the design concept of an simple is best and the
technology which Pioneer has cultivated are supplied unstintingly.
It
has a twin mono-construction structure which used the 3 transformer multi-power
supply as the base.
Including having made the power-source part of L/R
become independent the whole transformer, the layout on the printed circuit
board was also separated for every block, and the instability of the
lateralization accompanying separation aggravation is banished.
Furthermore,
the circuitry of a video-system system and the power source of an electronic
control system have the thorough structure of supplying from power transformer
with an another audio system, and a voltage stabilizer.
A function
switch is interlocked with at the time of an audio-source play, and the new
circuitry (PAT.P) which turns OFF the power source of a video-system system
automatically is carried in the video-system system circuitry.
In order
to negate an oscillation, various vibration proof parts are adopted.
The
polycarbonate is used for an insulator and the internal loss is absorbing the
oscillation efficiently greatly.
Moreover, the circuitry platform is fixed
by the rubber vibration insulator, and it has prevented an oscillation getting
across to a part because the rubber vibration insulator which connects a
platform and a chassis achieves the duty of a damper.
And in the receptacle bottom of a transformer, while the internal loss
has constructed the board of the copper which was greatly excellent in
adhesion and absorbs a fine oscillation, a magnetic distortion is prevented.
Moreover, the copper plating screw was used
for attachment of the printed circuit board, a chassis, a transformer, etc.,
etc., the fine oscillation was absorbed, and a magnetic distortion is prevented.
Aluminum Naked material with a large mass of 110g is adopted as a volume
knob.
The relay and electronic switch which were examined were made the
change of the function, it takes them, leading about of the product line to
chlorofluocarbon and a panel was reduced sharply, and a loss and a failure of a
signal are prevented.
The hybrid MC transformer scheme by the
combination of MC transformer which made the turn ratio the conventional
one-half, and the equalizer amplifier which raised the gain of the decrement of
a boost ratio is adopted.
Since a turn ratio can use few parts and bold-line
material, while direct current resistance decreases, the stray capacity between
coils also falls, and the high region property is improving sharply.
The
copper plating treatment of the whole chassis is carried out, and a magnetic
distortion is reduced sharply.
Moreover, the property to be easy to subside
even if a heterogeneous metals (a hard metals and soft metals) will be unified,
it is hard to receive an oscillation and it receives an oscillation has been
acquired.
An electronic formula was not used for the volume but the
scheme which drives a mechanism type high-grade volume by a motor is adopted as
it. This motor is a clutch type, and in the case of a manual operation, since a
motor separates, a comfortable operation feeling can be enjoyed.
Sharpness, the detail, and the full-scale video-system enhancer that
noise cancellation can control independently, respectively are built in the
video-system part.
Furthermore, Rec Monitor Out is equipped, and it can
record, monitoring the enhancing effect at the time of a picture recording.
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| Form |
Stereo control amplifier |
| Input sensitivity/impedance |
Phono man month: 2.5mV / 50kohm
Phono MC/40ohm: 250 microvolts/40 ohm
Phono MC/3ohm: 125 microvolts/three ohm
compact disk, Tuner, Tape Play1, 2, VDP, VTRs 1, 2, and 3, TV Tuner:150mV /,
50kohm |
| An Output voltage/impedance |
Tape Rec: 150mV / 1kohm
Pre Out: 1V/600
ohm |
Phono maximum permissible input
(1kHz,
0.1% of distortion) |
Phono MM:200mV
Phono MC/40ohm: 20mV
Phono MC/3ohm: 10mV |
| Tone control |
Bass: ±9dB (100Hz)
Treble: ±9dB (10kHz)
|
SN ratio (IHF, short circuit)
A network
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Phono MM:96dB(5mV)
Phono MC: 86dB (500
microvolts)
Tuner, compact disk, Tape Play, VDP, VTR: 109dB
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| Supply voltage |
AC100V, 50Hz/60Hz |
Power consumption
(Electrical Appliance and Material Control Law) |
36W |
| Dimensions |
Width 457x height 124x depth of 404mm
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| Weight |
9.7kg |
| Adjunct |
Remote control CU-C001 |
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