Audio Database

The

Accuphase E-306
\260,000 (December, 1994 release)

Description

The Integrated Amplifier which adopted the current feedback magnification circuit as the power amplifier part.

The current feedback type magnification circuit which returns an output signal in the form of current is adopted as a magnification circuit.
A principle lowers the impedance of the input terminal by the side of a return, detects current, and carries out I-V conversion of the current with a transformer impedance amplifier, and it has the structure of making an output signal, and since the impedance of a return input portion is very low, it is difficult to generate phase rotation.
Thereby, in order that there may almost be no necessity for phase compensation, it excelled in dynamic characteristics, such as a standup, and the natural energy response is realized.
Moreover, high power has been obtained by it being parallel for an output element and adopting the power transistor for audios excellent in many characteristics, such as a frequency response, a current gain linearity, and switching, as it.

The large-sized power transformer of the large power capacity of about 500 VA(s) and the mass filter condenser of 22,000 micro Fx2 are carried in the power-source part.

Line amplifier is constituted from a discrete part and the differential pure complimentary push pull input of an Accuphase with original foundations and the output stage serve as finish which prepared the single エンデッド push pull type emitter follower.

In consideration of the characteristic of the cartridge of MC type and each MM model, the equalizer amplifier equipped with the input circuit for exclusive use is adopted.
At the time of MM input, since the Output voltage of a cartridge and the Output load impedance are high, it constitutes from an FET element which can maintain high input impedance over all the frequency standby.
Moreover, since a very small signal is received by low impedance, the difference input circuit by a low noise element is constituted at the time of MC input, and it is enabling little reproduction of noise by attaining low impedance-ization of a NFB loop.

Since it prevents that a signal deteriorates in the change of an input selector etc. and a straight signal course is constituted at the shortest, the logic relay control system has been adopted.
The relay currently used has adopted the encapsulated type for communication industry, and contacts are a plated with gold and a crossbar twin system, and have realized low contact resistance and quantity durability.

Two balance inputs are prepared and balance transmission is possible.

The small motor with quality volume and a clutch is adopted as volume control, and smooth operation is enabled.
Control of volume adjustment according to a motor by attached remote control and the input selector by a logic circuit is possible.

The changeover switch and the input-and-output terminal are carried so that a preamplifier part and a power amplifier part can be used independently.

The large-sized peak power meter which monitors output electric power is equipped.
The meter can check a large dynamic range at once for a logarithm compression type.

The large-sized speaker terminal which can respond also to a thick speaker cable is adopted.
This terminal can also insert a banana plug.


Rear Attached
Internal
Power Preamplifier
Relay
Balance Remote Power Electrolytic Speaker

Rating of a mode
Form Integrated stereo Integrated Amplifier
Rated continuation average output
(Both channel simultaneous operation, 20Hz - 20kHz)
4ohm load: 140 W/ch
6ohm load: 120 W/ch
8ohm load: 100 W/ch
THD (both channel simultaneous operation) 0.04% (4-16-ohm load)
IM distortion 0.01%
Frequency response
(at the time of a rated continuation average output)
Main/High Level Input: 20Hz-20000Hz+0 -0.2dB
Low Level Input: 20Hz-20000Hz+0.2 -0.5dB
Dumping factor 120 (8-ohm load, 50Hz)
The disc maximum input
(1kHz, 0.005% of distortion)
MM input: 250mVrms (Rec Out)
MC input: 7.0mVrms (Rec Out)
Input sensitivity/input impedance
Input sensitivity Impedance
At the time of an Output power EIA (at the time of 1W output)
AD Input(MC): 0.11mV 0.01mV 100ohms
AD Input(MM): 3.9mV 0.39mV 47kohm
High Level Input: 113mV 11.3mV 20kohm
Balanced Input: 113mV 11.3mV 40kohm
Main Amp Input: 1.11V 112mV 20kohm
An Output voltage/Output load impedance
(at the time of a rated continuation average output)
Pre Output: 1.11V/50 ohm
Tape Rec Output: 110mV/200 ohms (AD)
Gain Main Input -> Output: 28dB
High Level Input -> Pre Output: 20dB
AD Input (MM) -> Tape Rec Output: 29dB
AD Input (MC) -> Tape Rec Output: 60dB
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 Input: 124dB -121dBV 102dB
High Level Input: 110dB -128dBV 83dB
Balanced Input: 90dB -108dBV 82dB
AD Input(MM): 85dB -132dBV 80dB
AD Input(MC): 70dB -146dBV 78dB
Loudness Compensation + 6dB (200Hz, Volume-30dB)
Subsonic Filter 25Hz, -12 dB/oct
Power meter Logarithm compression type peak level display
dB scale and the output Direct reading at the time of 8-ohm load
Load impedance 4-16ohm
Stereo headphone Conformity impedance: 4ohms - 100ohms
Power source AC100V, 50Hz/60Hz
Power consumption At the time of no inputting: 50W
Electrical Appliance and Material Control Law: 290W
At the time of an 8ohm load Output power: 390W
Dimensions Width 475x height 170x depth of 418mm
Weight 20.2kg
Attachment: Remote commander RC-14
Remote control system Infrared pulse system
Power source DC 3V
Battery Two AA (SUM-3/R6)
The maximum Dimensions Width 45x height 136x depth of 18mm
Weight 85g (Battery includeds)