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| Accuphase E-305V |
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| 280,000 yen(November, 1991 release) |
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.
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| 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
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| 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)
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| 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
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| Weight |
140g (Battery includeds) |
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