Pioneer A-D5

Commentary

Pre-main amplifier that uses direct energy MOS FET.

Direct Energy MOS FET is used for the output stage.
This device has low power loss, which adversely affects sound quality, good power linearity, and low load drive performance that enhances speaker drive performance. In addition, the high input impedance of the circuit allows the driver stage and output stage to be electrically separated, reducing interference with each other.
By combining this element with a wide-range linear circuit, we have achieved a simple circuit configuration that eliminates the emitter resistor and the choke coil at the speaker output terminal.

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. This circuit has excellent current linearity, flat output impedance from low to high band, and enables stable drive of speakers over a wide band.

Super-ring toroidal transformer is used for the power supply.
This transformer has the advantage of low loss and small leakage flux, making possible a cleaner power supply.

Copper plated steel is used for the chassis and rear panel to increase conductivity and reduce high-frequency impedance.

The power cord uses a grounded 3-core extra-thick type.

Speaker terminal compatible with banana plug is adopted.

Wireless remote control is included.

Model Rating

Type	Pre-main amplifier
Rated Output (Both channel drive)	110W + 110W (4 ω, 20 Hz to 20 kHz, 0.2%) 60W + 60W (8 Ω, 20 Hz to 20 kHz, 0.05%)
Input Sensitivity / Impedance	Phono MM : 2.8mV/50k Ω CD, Tuner, Line, DAT/Tape1, Tape2 : 200mV/50k Ω
Phono maximum allowable input	Phono MM : 150 mV (1 kHz, 0.1%)
Output Level / Impedance	DAT/Tape1, Tape2, Line, Rec, Adaptter out : 200mV/1k Ω
Frequency characteristic	Phono MM : 20 Hz to 20 kHz ± 0.5 dB CD, Tuner, Line, DAT/Tape1, Tape2 : 5 Hz to 150 kHz + 0 -3dB
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:88dB(2.8mV) CD, Tuner, Line, DAT/Tape1, Tape2 : 108 dB
Speaker load impedance	4 Ω ~ 16 Ω
AC outlet	Power switch interlock : 1 system (100W) Power switch not linked : 1 system (100W)
Power supply voltage	100 VAC, 50Hz/60Hz
Power consumption	160W (Electrical Appliance and Material Control Law)
External dimensions	Width 420x Height 132x Depth 335 mm
Weight	6.0kg
Attachment	Wireless Remote Control