Audio Database

The

Pioneer A-120
69,800yen(1982 release)

Description
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The dynamic non switching Integrated Amplifier which adopted the dynamic power supply scheme and the non switching circuit that it should correspond to a dynamic-range expansion of the source.

The original dynamic power supply scheme of Pioneer is adopted as a powering.
A level detector detects an input signal, and on level, it drives in a low-voltage part (VL), and if fixed level with an output is exceeded, it is usually a scheme with a high efficiency ratio driven in a high-voltage part (VH).
Furthermore, switching distortion which soils a music has adopted as a power part the original non switching circuit of Pioneer which is not generated theoretically.

In order to raise the purity of sound, from MC input to the speaker output is considered as 2 simple amplifier stream compositions.
High-level signals, such as Tape, Tuner, and AUX, are direct inputted into power amplifier, and the amplifying circuit to a speaker output has simple composition only of two amplifier by adoption of a high gain equalizer amplifier also at the time of MC play.
Moreover, an equalizer amplifier and power amplifier adopted DC servo, and perfect non coupling-capacitor-ization is realized.

DC servo high gain equalizer which uses low-noise dual FET for the first rank is used for an equalizer part.

While adopting a mass transformer as a power-source part, it is total and a 40,000-micro F electrolytic capacitor is adopted.

The line straight functionality is carried, with one switchpoint, a tone circuitry and a loudness circuitry are passed, a signal path is made simple, and a tone quality with a high purity can be obtained.

The code of a double insulation is adopted as a power cord.

The light emitting diode peek power indicator which displayed the peak value of the output 3 point in the circuitry which was excellent in the transient response is carried. The sensitivity changeover switch is carried and the correspondence according to a regeneration level is possible.

When light emitting diode is carried in the center of a slide knob of a tone control and a line straight functionality is turned OFF, light emitting diode lights up and the location of a knob is known.

A Equalizer

Rating of a mode
Form Integrated Amplifier
Effective output 120W+120W (20Hz - 20kHz, both channel drive, 8ohm)
THD (20Hz - 20kHz) 0.003% (at the time of an effective output)
Cross modulation distortion (50Hz:7kHz=4:1) 0.003% (at the time of an effective output)
Output bandwidth 5Hz - 55kHz (IHF, both channel drive, THD0.01%)
Output-terminal Speaker(4ohm-16ohm): A, B, A+B
Tape Rec:150mV
Dumping factor 70 (20Hz - 20kHz, 8ohm)
Input sensitivity/impedance Phono man month: 2.5mV / 50kohm
Phono MC: 0.2mV/100 ohms
Tuner, AUX, Tape Play1, 2:150mV / 50kohm
Phono maximum permissible input (1kHz, THD0.005%) MM:150mV
MC:11mV
Frequency characteristic Phono man month: 20Hz-20kHz}0.2dB
Tuner, AUX, and Tape Play:5Hz-100kHz+0 -3 dB
SN ratio
(IHF, A network, a short circuit)
Phono MM:88dB
Phono MC:70dB
Tuner, AUX, Tape Play: 110dB
Tone control Bass: }10dB (100Hz)
Treble: }10dB (10kHz)
Filter Low: 15Hz, 6 dB/oct.
Loudness contour (Volume-40dB o'clock) + 6dB (100Hz), +3dB (10kHz)
Supply voltage AC100V, 50Hz/60Hz
Power consumption (Electrical Appliance and Material Control Law) 260W
Dimensions Width 420x height 131x depth of 411mm
Weight 12.0kg