Pioneer A-100

Commentary

Pre-main amplifier equipped with dynamic non-switching amplifier.

Pioneer's original dynamic power supply system is used to supply power to CDs and other sources with a wide dynamic range.
In this system, an input signal is detected by a level detector, and a low voltage section (V_LWhen the output exceeds a certain level, the high-voltage section (V_HIn addition, the power section is equipped with Pioneer's original non-switching circuit that completely eliminates switching distortion, thereby realizing high-quality drive.

In addition to a simple two amplifier configuration from the MC input to the speaker output, the high-level signal is directly input to the power amplifier to improve sound purity.
In addition, by adopting DC servo, the equalizer amplifier and power amplifier are completely non-coupling capacitors.

The equalizer section employs a DC servo high-gain equalizer with low-noise, high-gain dual FET in the first stage to improve the signal-to-noise ratio.
In addition, the RIAA element, which actually affects sound quality, is composed of a polypropylene condenser and a brass cap non-magnetic resistor for high sound quality. In addition, a resin case condenser is used for the DC servo circuit. This structure emphasizes sound quality.

Equipped with a line straight function, it passes through the tone circuit and loudness circuit by pressing the switch, and you can enjoy more pure sound quality.

The power cord uses a double-shielded cord.

Model Rating

Type	Pre-main amplifier
Effective power	100W + 100W (8 Ω, 20 Hz to 20 kHz, both channel drive)
Harmonic distortion factor	0.007% (20 Hz ~ 20 kHz, Effective Output)
Output bandwidth	5 Hz ~ 100 kHz (IHF, both channel drive, THD0.05%)
Output terminal	Speaker (4 Ω ~ 16 Ω) : A, B, A + B Tape Rec:150mV
Damping factor	60 (20 Hz ~ 20 kHz, 8 Ω)
Input Sensitivity / Impedance	Phono MM : 2.5mV/50k Ω Phono MC : 0.2mV/100 Ω Tuner, CD/AUX, Tape Play1, 2 : 150mV/50k Ω
Phono maximum allowable input (1 kHz, THD0.005%)	MM:200mV MC:17mV
Frequency characteristic	Phono MM : 20 Hz to 20 kHz ± 0.2 dB Tuner, CD/Aux, Tape Play : 5 hz to 100 khz ± 3 db
Signal-to-noise ratio (IHF, A-network Short circuit)	Phono MM:86dB Phono MC:70dB Tuner, CD/AUX, Tape Play : 105 dB
Tone control	Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz)
Filter	Low : 15 Hz, -6dB/oct.
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	220W (Electrical Appliance and Material Control Law)
External dimensions	Width 420x Height 130x Depth 331 mm
Weight	9kg