Audio Database

The

Pioneer C-70
85,000yen(1990 release)

Description
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Audio-video control amplifier carrying direct construction IBM PCN II or a clean grand system.

In order to attain shortest-ization of a signal path, direct construction IBM PCN II is adopted.
Full use of the relay and electronic formula switchpoint which were considered in tone quality was made for shortest-izing of a path, and the input multiple contact switch and the REC multiple contact switch are arranged in the shortest location just behind a signal input part.
Furthermore, a volume is also made to approach a multiple contact switch extremely, and it is acting to the same field as the circuit board as Assen Bull. Moreover, distance to the signal output from the circuitry unit is also shortest-ized. By direct-on, the distance from an input to an output is especially shortened by 50cm conjointly with the proper location of each circuitry block.

In order to prevent a harmful noise electric current having an ill effect on a signal path, the original clean grand system of Pioneer is carried.
It is stopping beforehand that put a review of the contact of a circuitry and a chassis into practice, make the power transformer and chassis used as the source of a noise into an insulated structure, and a noise invades into a signal path.
Furthermore, after taking the product line into consideration, the contact of a circuitry and a chassis was connected with the suitable point, and the it1 path which returns only a noise electric current to a noise source is also established.

In order to eliminate that the signal of each block is transmitted and interferes in a power-source part to other circuitry units owing to each property of the, the extravagant 2 transformer multi-supply power-source stream composition which formed the audio system, the control system, and the video-system system into another transformer is adopted.
The control system power source which is easy to emit a pulse nature noise, and the video-system system power source which takes charge of an amplification of an included wide band frequency for an audio band were made to make it independent from an audio system power source, and the interference is eliminated thoroughly.

In order for a video-system system circuitry to prevent interfering in an audio system circuitry by amplifying a broadband signal also except a power-source part, it has stored the video-system system substrate to metal casing as a measure against a shielding. Moreover, the interference is suppressed as a perfect separation design arranged in order to suppress an interference also in the distance and location from the circuit board of an audio system and a video-system system to the earth line.
Furthermore, the local power-off functionality to shut off automatically power sources, such as a Phono equalizer circuitry which is not used, is carried except the time of the video-system system circuitry which does not operate, or a record play except the time of the video-system system circuitry which does not operate, or a record play at the time of an audio play.
Moreover, when not operating it, to the control oriented microcomputer of switchpoints, the factor of a tone-quality failure is removed as much as possible, and a feeling of S/N in a real operation is greatly improved to it, such as adopting the silence operation microcomputer which suspends the oscillation.

The thing adhering to a tone quality is selected carefully and adopted as parts.
In the volume, S/N at the time of a high precision control and a real using was improved greatly, and the newly developed motor-drive 4-unit volume that realized the smooth motion is adopted.
Moreover, he is putting into practice and examining the quality of the material, and a property and a tone quality until it begins operational amplifier IC of a low-noise and results in a capacitor, a resistor and a substrate, and lead wire.

Five audios and the input terminal of five video systems are carried.
Moreover, all the input/output terminals have adopted the gilding termination, and the S terminal is also carried in the image termination.

A REC selector, a BGV functionality, a back picture recording which pass compact-disk sound on the image of a video system, etc. are possible.

The fixed output is carried in order to correspond to a surround processor etc.
This termination is outputted on fixed level, and each channel and the level adjustment of a master can control by the processor side, and also it is aiming at the correspondence with the power amplifier which equipped the volume.
Moreover, it is through at the time of direct-on, and at the time of OFF, the signal which passed the balance volume and the Subsonic Filter is outputted, and the correspondence according to the time of the Output voltage of the source or a setup is carried out to this output.

It is attached in the remote control with a learning function which carries out memory of the command of other remote control, and can collect the operation.
Almost all equipments can control with this one remote control. Moreover, a study is added also to a color code and placement of an operation switchpoint, and facility is improved.
The equipment with SR multiple asynchronously communicating hosts of Pioneer is controllable as it is.

Rear
Internal An
4-unit
The
Audio

Rating of a mode
Form audio-video control amplifier
<Amplifier part>
Input sensitivity/impedance Phono man month: 2.5mV / 50kohm
Phono MC: 0.25mV/100 ohm
compact disk, Tuner, Tape Play, LD, TV/AUX, Video, VCR Play:150mV /, 50kohm
An Output voltage/impedance Tape Rec, VCR Rec, and Tape2 Monitor Rec:150mV /, 2.2kohm
Pre Out Variable: 1V/1kohm
Fixed: 150mV / 2.2kohm
THD
(20Hz - 20kHz)
Pre Out Variable: 0.002% (1V/10kohm)
Fixed: 0.001% (150mV / 50kohm)
Maximum output Pre Out Variable: 7V / 10kohm (20Hz - 20kHz, 0.01%)
Frequency characteristic Phono man month: 20Hz-20kHz}0.2dB
Phono MC: 20Hz-20kHz}0.3dB
compact disk, Tuner, Tape Play, LD, TV/Aux, Video, and VCR Play:1Hz-150kHz+0 -3 dB
Tone control
(Volume-40dB)
Bass: }8dB, 100Hz
Treble: }8dB, 10kHz
Filter Subsonic: 17Hz-12dB / oct
Muting - infinitydecibel
SN ratio (IHF, A network)
Short circuit
Phono MM:93dB(5mV)
Phono MC: 76dB (500 microvolts)
compact disk, Tuner, Tape Play, LD, TV/AUX, VIdeo, VCR PLay: 106dB
<Video-system part>
(Composite)
Input sensitivity/impedance LD, TV/AUX, Video, VCR1, 2:1 Vp-p/75 ohm, Unbalanced
An Output voltage/impedance VCR 1 and 2, Monitor: 1 Vp-p/75 ohms, Unbalanced
DG 2% or less
DP 2 degrees or less
Frequency characteristic 10Hz-10MHz+0 -3 dB
SN ratio 60dB or more
(S terminal part)
Input sensitivity/impedance LD, TV/AUX, Video, VCR 1 and 2
Luminance signal: 1 Vp-p/75 ohms, Unbalanced
Chrominance signal: 0.286 Vp-p/75 ohm, Unbalanced
An Output voltage/impedance VCR 1 and 2, Monitor
Luminance signal: 1 Vp-p/75 ohm, Unbalanced
Chrominance signal: 0.286 Vp-p/75 ohm, Unbalanced
Luminance-signal frequency characteristic 10Hz-10MHz+0 -3 dB
Luminance-signal SN ratio 60dB or more
<Synthesis>
Supply voltage AC100V, 50Hz/60Hz
Power consumption 300W (Electrical Appliance and Material Control Law)
AC outlet Power-switch interlock: Two lines, 400W
Power-switch un-interlocking.: One line, 100W
Dimensions Width 420x height 163x depth of 417mm
Weight 10.6kg or less
Adjunct Remote control CU-C004