Pioneer A-D3

Commentary

A pre-main amplifier with improved cost performance while inheriting the A-D5 technology.

Direct Energy MOS-FET is used for the output stage.
Since the on-resistance of this element is very small, it realizes excellent power linearity and has high low-load drive capability.

Wide range linear circuit is used for the circuit structure.
This circuit employs a simple structure in which the required gain is obtained by one stage amplification using a current feedback circuit. It has excellent current linearity, flat output impedance, and stable driving from low to high frequencies is possible.

By combining a Direct Energy MOS-FET with a wide-range linear circuit, the choke coil at the source resistor and the speaker output terminal is eliminated, resulting in simplification, low heat generation, and miniaturization.

An complimentary service capacitance pair is used for the smoothing capacitor of the power supply.
In this condenser, the magnetic field generated on the positive side and the magnetic field generated on the negative side cancel each other.

It uses parts that emphasize sound quality, such as non-magnetic resistance and audio condenser, which were used for advanced models.

The internal layout is symmetrical and symmetrical to minimize the signal path.
In addition, an independent heat sink made of thick aluminum extruding material is adopted for each of the direct-energy MOS-FETs, eliminating insulation between the power elements and the heat sink that could not be eliminated by conventional amplifiers, and eliminating mutual interference between the direct-energy MOS-FETs at the output stage.

Front panel made of aluminum extruding material and aluminum volume knob are used.

Equipped with a direct button that passes through the balance circuit and tone circuit.

Equipped with a local circuit off function that cuts the power supply to the circuit when not in use.

Phono input terminal is mounted.

An inlet type power cord is used.

Wireless remote control is included.

Model Rating

Type	Pre-main amplifier
Maximum practical power	100W + 100W (EIAJ, 4 Ω)
Rated Output (Both channel drive)	70W + 70W (4 ω, 20 Hz-20 kHz, 0.2%) 45W + 45W (8 ohm, 20 hz to 20 khz, 0.1%)
Input Sensitivity / Impedance	Phono MM : 2.8mV/50k Ω CD, Tuner, Line, Tape1/MD, Tape2/monitor : 200mV/50k Ω
Phono maximum allowable input	Phono MM : 150 mV (1 kHz, 0.1%)
Output Level / Impedance	Tape1/MD, Tape2/Monitor : 200mV/1k Ω Tape rec : 200mV/1k Ω
Frequency characteristic	Phono MM : 20 Hz to 20 kHz ± 0.3 dB CD, Tuner, Line, Tape1/MD, Tape2/Monitor : 5 Hz to 100 kHz + 0 -2dB
Tone control	Bass : ± 8 dB (100 Hz) Treble : ± 8 dB (10 kHz)
Loudness contour (Vol -30dB)	+ 5 dB (100 Hz), + 3 dB (10 kHz)
Signal-to-noise ratio (IHF, A-network, short circuit)	Phono MM:85dB(at 5mV) CD, Tuner, Line, Tape1/MD, Tape2/Monitor : 108 dB
Speaker load impedance	A, B : 4 Ω ~ 16 Ω A + B : 8 Ω ~ 32 Ω
AC outlet	Power Switch Interlock : 2 Systems (100W) Power switch not linked : 1 system (100W)
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	110W (Electrical Appliance and Material Control Law)
External dimensions	Width 420x Height 114x Depth 307 mm
Weight	5.9kg
Attachment	Wireless Remote Control