Audio Database

Integrated amplifier which supplied the development technology of separate amplifier, renewed the image of the conventional Integrated Amplifier, and investigated cost performance to the limit.
There were two kinds of E-210A which built in E-210 and the equalizer amplifier for analog discs of line amplifier composition.

The power transistor for audios of Oide power multi-emitter structure excellent in many characteristics, such as a frequency response, an electric power amplification factor linearity, and switching, is adopted as the output stage of a power amplifier part. It has structure which carried out parallel connection of this and was attached to the large-sized heat sink.
Operation to heat adopted the power MOS FET of the negative characteristic as the drive stage, the power transistor and heat inclination of the right characteristic were offset, and stable operation is realized in it.

Although many voltage return types which return a part of Output voltage to an input are used in the general magnification circuit, in E-210, the current feedback type magnification circuit which returns an output signal in the form of current is adopted.
This circuit lowers the impedance of the input terminal by the side of a return, detects current, carries out I-V (current-voltage) conversion of that current with a transformer impedance amplifier, and makes an output signal. Since the impedance of a return input portion is very low, it is hard to generate phase rotation and, as a result, there is almost no necessity for a phase guarantee.
For this reason, it excelled in dynamic characteristics, such as a standup, and sound quality is sharply improved by natural energy response.

The system which inputs line-in signals, such as CD and a tuner, into direct high gain power amplifier is adopted.
Even if this system enlarges a gain, by the current feedback magnification circuit where stability is high, it has acquired the higher effect and has realized the improvement of many characteristics, such as low noise-izing.

22,000micro of filter capacitors of fx2 are carried in the power-source part with the large-sized power transformer of about 400 VA.

Since a straight signal course is constituted at the shortest, the logic relay control system has been adopted.
Adopting the sealed type for communication industry as the relay used by this system, a contact is the crossbar twin system plated with gold, and has become a thing of low contact resistance and quantity durability which has high quality.

The balance input is carried.
As for balance transmission, the sending side transmits simultaneously the signal which the phase reversed on the same voltage, and, in response, the receptacle side is compounded with + amplifier and - amplifier. In order that the noise ingredient generated in a cable at this time may go into two poles at this phase, if it is compounded, it will be canceled, and it disappears by a noise, and the purity of a music signal goes up it.

The remote commander who can change volume control and input sauce is carried.
Volume control enables smooth operation with the combination of high-quality sound and a volume controller, and a small motor with a clutch.
Moreover, an input selector controls a logic circuit by a commander.

The large-sized speaker terminal which corresponds also to a banana plug and can respond also to a thick speaker cable is carried.

In E-210A, Phono equalizer amplifier is built in and it has the input circuit in consideration of the characteristic of each MC/MM type cartridge for exclusive use.
At the time of MM input, it constitutes from a low noise FET element which was excellent in the noise characteristic with high signal source impedance in consideration of an Output voltage and an Output load impedance being high.
Moreover, at the time of MC input, since a minute signal is received by low impedance, little reproduction of noise is enabled by constituting the difference input circuit by a low noise element, and attaining low impedance-ization of a NFB loop.

There is a Phono equalizer amplifier board of E-210 exclusive use as an option, and upgrade to E-210A is possible.

Volume Speaker A power transistor and Power MOS FET
Power Block The

Rating of a mode
AD relations are the characteristics of E-210A.
Form Integrated stereo amplifier
Rated continuation average output
(both channel operation, 20Hz - 20kHz)
110 W/ch (4ohms)
100 W/ch (6ohms)
80 W/ch (8ohms)
THD (both channel operation) 0.04%
IM distortion 0.01%
Frequency response
(at the time of a rated continuation average output)
High Level input: 20Hz-20kHz+0 -0.2dB
Low Level input: 20Hz-20kHz+0.2 -0.5dB
Dumping factor 110 (8-ohm load, 50Hz)
Input sensitivity
(an Output power / EIA1W output)/impedance
AD input(MC): 0.201mV/22.5 microvolt/100 ohms
AD input(MM): 7.0mV/780microvolt/47kohm
High Level input: 201mV/22.5mV/20kohm
Balanced input: 201mV/22.5mV/40kohm
The Disc maximum input
(Rec out, 1kHz, 0.005% of distortion)
An Output voltage/impedance
(at the time of a rated continuation average output)
Tape Rec output: 200mV/200 ohms (AD)
Gain High Level input -> Output: 42dB
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
High Level input: 113dB -127dBV 83dB
Balanced input: 94dB -108dBV 83dB
AD input(MM): 92dB -135dBV 82dB
AD input(MC): 78dB -152dBV 81dB
Subsonic Filter 25Hz, -12 dB/oct
Load impedance 4ohm-16ohm
Headphone jack Conformity impedance: 4ohms - 100ohms
Power source AC100V, 50Hz/60Hz
Power consumption 35W (at the time of E-210 and no inputting)
37W (at the time of E-210A and no inputting)
190W (Electrical Appliance and Material Control Law)
315W (at the time of an 8-ohm load Output power)
The maximum Dimensions Width 475x height 150x depth of 417mm
Weight 18.0kg
Attachment: Remote commander RC-15
Remote control system Infrared pulse system
Power source DC 3V
Dry cell AA (SUM-3/R6), two pieces
The maximum Dimensions Width 45x height 136x depth of 18mm
Weight 85g(Battery Includid)