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.

Model Rating
AD relations are characteristic of the E-210A
Model Integrated Stereo Amplifier
Rated continuous average output
(Operates on both channels, 20 Hz to 20 kHz)
Total harmonic distortion ratio (both channels) 0.04%
IM distortion factor 0.01%
Frequency characteristics (at rated continuous average output) High Level input:20Hz~20kHz +0 -0.2dB
Low Level input:20Hz~20kHz +0.2 -0.5dB
Damping Factor 110 (8Ω load, 50Hz)
Input sensitivity/impedance
(Rated output/EIA1W output)
AD input(MC):0.201mV/22.5μV/100Ω
AD input(MM):7.0mV/780μV/47kΩ
High Level input:201mV/22.5mV/20kΩ
Balanced input:201mV/22.5mV/40kΩ
Disc maximum input
(Rec out, 1kHz, 0.005% distortion)
Output Voltage/Impedance Tape Rec output:200mV/200Ω(from AD, at rated continuous average output)
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 and A-correction EIA S/N
S/N at rated input Input converted noise
High Level input: 113dB -127dBV 83dB
Balanced input: 94dB -108dBV 83dB
AD input(MM): 92dB -135dBV 82dB
AD input(MC): 78dB -152dBV 81dB
Sub-sonic Filter 25Hz, -12dB/oct
Load Impedance 4 ohm to 16 ohm
Headphone jack Appropriate impedance: 4Ω to 100Ω
Power supply 100V AC, 50Hz/60Hz
Power Consumption 35W(E-210, no input)
37W(E-210A, no input)
190W(Electrical Appliance and Material Control Law)
315W(at 8Ω load rating)
Maximum external dimensions W475xH150xD417mm
Weight 18.0kg
Included:Remote Commander RC-15
Remote control method Infrared pulse method
power supply DC 3V
Batteries AA 3 (SUM-3/R6), 2 pieces
Maximum external dimensions Width 45x height 136x depth of 18mm
weight 85g (including batteries)