Audio Database

The

Accuphase E-305V
280,000 yen(November, 1991 release)

Description

The Integrated Amplifier to which the polish was applied based on E-305 and which raised completeness.

With the development technology cultivated for years, the Accuphase is pursuing about the same quality as separate amplifier by improving a circuit and a construction.

The power amplifier part serves as 3 parallel connection by which 3 parallel connection of N channel power MOS FET and the P channel power MOS FET was carried out to the element of the output stage, respectively.
It is possible to take out sufficient power to low impedance by parallel use of Power MOS FET.

Dregs cord connection is adopted as the driver stage which drives Power MOS FET.
By suppressing phase rotation small as much as possible, and making small voltage impressed to the input unit of a dregs cord stage, by pulling out the engine performance of an element, it becomes a broadband and an extensive linearity and the drive to Power MOS FET can be performed ideally.
Moreover, FET of the input is further made dregs cord connection at the input unit using the original complimentary differential push pull circuit of an Accuphase.

Each unit amplifier for the object for analog discs, the object for high-level, and power of all is connected by the direct connection system.
It is direct-current stabilizing [ powerful ] in each unit amplifier, applying it, and generating of direct-current drift is suppressed.

The newly developed volume controller is adopted.
Especially the adjustor of an input level has adopted the resistance object of little specular surface finishing of a distortion, it excels in antiwear quality depending on whether it is a specular surface, and, moreover, what spoils sound qualities, such as grease, is not applied between the brush and the resistance object.
Moreover, a general volume structure is although a lead is taken out outside from the fixed stator resistance object through a カシメ portion and the brush has become a slide child,A resistance object rotates and the Attenuator of E-305V has structure which the portion of a brush is fixed and comes out to the directly exterior as a terminal. This reduces a metal joining section from five places to three places, and improvement in sound quality is aimed at.
A gearing system and an electric motor are attached to this volume controller, and remote control is supported.

adoption s Logic relay control is in the change of small signals, such as an input selector.
By using the encapsulated type relay containing nitrogen gas, while preventing a secular change etc., since it can arrange, wiring by a curtate distance is enabled locally.
The plated with gold and crossbar twin structure for communication industry are used for this relay.

The remote control in which input sauce and volume control are possible is attached.
An input selector does not have degradation of sound quality by controlling this logic circuit by a commander for the system which changes a relay electronically. Moreover, volume control has also adopted the volume controller with a motor, and has given the magnetic shield to the exterior covering of this motor with the silicon steel plate, and the influence by noise is suppressed.
The micro computer is adopted as the recovery of remote control.

The equalizer amplifier in consideration of the characteristic of the cartridge of MM type and each MC model is carried.
At the time of MM input, it constitutes from an FET element which can maintain back input impedance over all the frequency bands in consideration of sy copy power voltage of MM cartridge and an Output load impedance being high.
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 enables little reproduction of noise by planning low impedance of a NFB loop.

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.

The added type active filter system tone control currently used for the full-scale graphic equalizer is adopted.
It passes straight, if needed, an original signal is another, makes the characteristic, is a system which a signal is made to subtract and add, and has structure which thought sound quality as important.

Interference through a power-source part is prevented by using an exclusive power source and a constant voltage circuit for a preamplifier part and each power amplifier part.
Moreover, in order to stop the bad influence by electrostatic coupling, electromagnetic induction, etc., it has coped with devising an internal structure and arrangement etc.

Two tape recorders can be inputted as eight inputs. Among these, the balance input is prepared for two lines, CD and Line.

The output surveillance of a power amplifier part can be checked with a large-sized power meter.
Meter has adopted the logarithm compression type and can see a large dynamic range at once.

A / B-2 system change is possible for a speaker. Moreover, there is an A+B position and two lines can connect the bi-wiring speaker which became parallel and separated the object for low-pitched sound, and the network for loud sounds.



Rating of a mode
Form Integrated stereo Integrated Amplifier
Continuation average output (both channel operation)
20Hz - 20kHz, 0.02% of a distortion
4ohm load: 180 W/ch
8ohm load: 130 W/ch
THD (both channel operation)
0.25W - a continuation output, 20Hz - 20kHz
0.02% (4-16-ohm load)
IM distortion 0.01%
Frequency response
Main Amp Input: 20Hz-20000Hz+0 -0.2dB (at the time of an Output power)
0.5Hz-150000Hz+0 -3.0dB (at the time of 1W output)
High Level Input: 20Hz-20000Hz+0 -0.2dB (at the time of an Output power)
Low Level Input: 20Hz-20000Hz+0.2 -0.5dB (at the time of an Output power)
Dumping factor 100 (8-ohm load, 50Hz)
A rated input / input impedance
Input sensitivity Impedance
At the time of an Output power EIA (at the time of 1W output)
AD Input(MC): 0.123mV 0.01mV 100ohms
AD Input(MM): 4.3mV 0.34mV 47kohm
High Level Input: 125mV 10.9mV 20kohm
Balanced Input: 125mV 10.9mV 40kohm
Main Amp Input: 1.28V 111mV 20kohm
An Output power/Output load impedance Pre Output: 1.28V/200 ohm
Tape Rec Output: 125mV/200 ohms (AD)
Headphones: 0.4V, conformity impedance 4-100ohm
Gain Main Input -> Output: 28dB
High Level Input -> Pre Output: 20dB
AD Input (MM) -> Tape Rec Output: 30dB
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 Amp Input: 124dB -121dBV 102dB
High Level Input: 110dB -128dBV 83dB
Balanced Input: 90dB -108dBV 82dB
AD Input(MM): 88dB -137dBV 80dB
AD Input(MC): 72dB -150dBV 80dB
Tone control Low-pitched sound: Turnover frequency 300Hz, ±10dB (50Hz)
Loud sound: Turnover frequency 3kHz, ±10dB (20kHz)
Subsonic Filter 17Hz, -12 dB/oct
Attenuator -20dB
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
The semiconductor used Transistor: 59 pieces
FET: 22 pieces
IC: 24 pieces
Diode: 69 pieces
Power source 100V/117V/220V/240V, 50Hz/60Hz
Power consumption At the time of no inputting: 65W
Electrical Appliance and Material Control Law: 310W
At the time of an 8ohm load Output power: 490W
Dimensions Width 475x height 170x depth of 418mm
Weight 22.7kg
Attachment: Remote commander RC-8
Remote control system Infrared pulse system
Power source DC 3V
Battery SUM-3(IEC name R6) 2 piece
The maximum Dimensions Width 64x height 149x depth of 18mm
Weight 140g (Battery includeds)