Audio Database


Accuphase E-306V
280,000 yen(December, 1997 release)


Integrated amplifier which refined E-306 aiming at the further maturing, and polished up sound quality thoroughly.

The power transistor for the Oide power audios excellent in many characteristics, such as the high frequency characteristic, a current gain linearity, and switching, is adopted as the output element of a power amplifier part.
This element is constituted from a parallel push pull, efficient heat dissipation processing is carried out by attaching on a large-sized heat sink, and stable operation is realized.

The current feedback magnification circuit which does not have phase rotation in both a power amplifier part and a line amplifier part is adopted.
In this circuit, the impedance of the input terminal which is a return side is lowered, current is detected, I-V (current-voltage) conversion of that current is carried out with a transformer impedance amplifier, and an output signal is made. For this reason, since the impedance of a return input portion is low, it is hard to generate phase rotation and there is almost no necessity for phase compensation.
Many characteristics have been sharply improved by a little NFB by this, it excelled in the dynamic characteristic, and the natural energy response is realized.

The line amplifier part consists of discrete parts by a current feedback magnification circuit.
Foundations are finished comparatively simply by the original of an Accuphase, and a pure complimentary push pull. Phase compensation of each stage can be made light by this, and the further sound quality improvement is aimed at.

Since a straight signal course is constituted at the shortest, the logic relay control system which controls a relay electronically has been adopted.
The sealed type relay for communication industry is adopted as a relay, and a contact is a plated-with-gold crossbar twin system, and has realized low contact resistance and quantity durability.

The added type active filter system currently used for the full-scale graphic equalizer is adopted as tone control.
From this system, it passes straight, and if needed, an original flat signal is another, and makes the characteristic, and it is controlling according to making it adjust from a flat signal by it.

The large-sized speaker terminal of brass Naked material shaving appearance which can respond also to a thick speaker cable is carried.

The large-sized transformer of the large power capacity of about 500 VA is adopted as a power-source part. Moreover, the filter capacitor carries two children of 22,000-micro F things.

The large-sized peak power meter which monitors output electric power is carried.
This meter is a logarithm compression type and can see a large dynamic range at once.

A preamplifier part and a power amplifier part are separated and the changeover switch and input-and-output terminal for using it as independent amplifier are carried.

Two balance inputs are carried.

The remote commander who can change volume control and an input selector is attached.

The slot which can insert an AAB standard (Accuphase Analog Bus) option board is carried in the rear panel.

Rear Option
Power Balance

Rating of a mode
Form Integrated stereo amplifier
Rated continuation average output
(Both channel operation, 20Hz - 20kHz)
140 W/ch (4ohms)
120 W/ch (6ohms)
100 W/ch (8ohms)
THD (both channel operation) 0.035% (4ohms - 16-ohm load)
IM distortion 0.01%
Frequency response
Main amp input: 20Hz-20kHz+0 -0.2 dB (at the time of a rated continuation average output)
2Hz-150kHz+0 -3.0dB (at the time of 1W output)
High Level input: 20Hz-20kHz+0 -0.2 dB (at the time of a rated continuation average output)
Dumping factor 100 (8-ohm load, 50Hz)
Input sensitivity/impedance
(An Output power / EIA1W output)
High Level input: 113mV/11.2mV/20kohm
Balanced input: 113mV/11.2mV/40kohm
Main input: 1.13V/112mV/20kohm
An Output power/impedance Pre output: 1.13V/50 ohm (at the time of a rated continuation output)
Gain Main input -> output: 28dB
High Level input -> Pre output: 20dB
S/N, input conversion noise
Input short-circuit and A-compensation EIA S/N
At the time of a rated input S/N Input conversion noise
Main amp input: 122dB -121dBV 100dB
High Level input: 104dB -123dBV 80dB
Balanced input: 88dB -107dBV 80dB
Tone control Low-pitched sound (300Hz): ±10dB (50Hz)
Loud sound (3kHz): ±10dB (20kHz)
Loudness Compensation + 6dB (200Hz, Volume-30dB)
Power meter Logarithm compression type peak level display
dB scale and the output Direct reading at the time of 8-ohm load
Load impedance 4ohm-16ohm
Headphone jack Conformity impedance: 4ohms - 100ohms
Power source AC100V, 50Hz/60Hz
Power consumption 50W (at the time of no inputting)
240W (Electrical Appliance and Material Control Law)
385W (at the time of an 8-ohm load Output power)
The maximum Dimensions Width 475x height 170x depth of 418mm
Weight 20.5kg
Attachment: Remote commander RC-22
Remote control system Infrared pulse system
Power source DC 3V
Battery AA -- type and two pieces
The maximum Dimensions Width 45x height 136x depth of 18mm
Weight 85g (Battery 含む)
Option: Option board
The Line-in board Line-10 (8,000yen)
The common high-level input terminal of an imbalanced system.
Analog signals, such as CD player and a tuner, are played.
The Analog disc input board AD-10 (50,000yen)
All cartridges are supported by loading of a highly efficient high gain equalizer.
With an internal DIP switch, a MM/MC change, MC input impedance, and Subsonic-Filter on/off can be set up.

MM Gain: 29dB
Input impedance: 47kohm
MC Gain: 60dB
Input impedance: 10, a 30 or 100-ohm change