EA-3

2007-2008 The BEST BUY components No.1

2006-2007 The BEST BUY components No.1

stereo Best Buy Components 2006, Greatest Component

Audio Excellence Award 2007

The 25nd MJ Technology of the year

 Radio technology Best Stereo Components Grand Prix

With our slogan, “Analog still does not reach the limit.” We have commercialized High　end audio equipment to analog disc fans.Our products line-up has been expanded since 2005 because Model 3 series were added.Besides, we have been providing the music impression of only analog disc intending by Phase Tech and gaining support among more a lot of customers.This time, we made full use of semiconductor-circuit technologies keeping the idea of Phase Tech, and developed the Phono Equalizer Amplifier of Model 3 series.

Amplifier circuit by semiconductor chip

FULL SYMMETRICAL NON-FEEDBACK CIRCUIT：TM
We aim at the expansion of the ability to express music, and developed and installed newly the full symmetrical non-feedback circuit by a suitable operation of current amplification for the semiconductor. As a result, we have achieved difficult “Rich expression of tone scale, Sense of Energy and High S/N, Compatible prominent spatial expression.” in the amplifier with a traditional transistor device.

The detail of amplifier

The first layer is composed of the voltage current conversion circuit with extremely low noise by a complimentary connection of complementarity FET (field-effect transistor).The well-selected device that the operation point is decided by the self-bias operation does not need the bias circuit, or there is neither an inflow of the noise nor a deterioration factor of sound quality, and works the device’s original operation with low noise.

The second layer is composed of the current amplification and the voltage conversion circuit, and obtains the reproduction characteristic with the RIAA impedance device connected with the current output point.Therefore, it is composed of the CR type equalizer circuit without the RIAA deflection to the super-high frequency and obtains an excellent transient characteristic.In this circuit, various circuit techniques for operation with high accuracy are utilized without the influence of the parameter change of the amplification device that depends on the current conversion error margin and the output voltage. It is succeeded in obtaining the excellent characteristic that equals the feed-back amplifier though it is non-feedback amplifier.

The output buffer circuit secures wideband high input impedance by the input bootstrap. The output device by Darlington connection has enough current amplification at the same time, and drives the equipment connected with the next layer strongly.

Realized vibration free, resonance free and interference free

In the phono amp that amplifies a slight signal, it is required realization of vibration free, resonance free and interference free and simple signal transmission for keeping signal purity

Mechanical earth
Direct grounding construction of power supply transformer
DIRECT GROUNDING CONSTRUCTION：TM
The Rcore type power supply transformer of EA-3 operates with margin by magnetic flux density, and it has been reduced magnetic vibration and generation of leakage flux as much as possible.　
In addition, this transformer is assembled directly to planed brass foot through the bakelite board 5mm thickness that is an insulator high electric resistance and reluctance. As a result, the vibration that the power transformer originates is discharged into the earth at once without transmitting to the chassis.

Dual monaural construction
・Except AC1 withdrawing line, it has been composed the symmetrical dual monaural construction completely,
and achieved the advanced uniformity of right and left channel.
・It supplies an ideal power without the parameter change due to the power supply load by right and left independent
power supply transformer and shunt type local power supply. And the channel separation and over 100dB(20Hz-20KHz)
has been achieved by minimizing the loop of the circuit electric current.

The cassis of structure for vibration free, resonance free and interference free
・The delicate amplification part mounts sub-chassis floated in electromagnetism because it doesn't receive the
influence of harmful signal and vibrations other than the music signal. Consequently, it has been realized the idea
of vibration free, resonance free, interference free.
・The 1.2mm thick steel plate and the 1.6mm thick one have been copper-plated for the chassis and top cover,
and done the finish paint. It has been achieved reduction of magnetic distortion and securing of strength.
　 It is consisted of the structure for vibration free, resonance free, and interference free because the front panel
has been made of the aluminum planed 6mm thick.

Adoption of parts for high sound quality
The metal film resistor is used for all layer of the EA-3 amplification circuit in order that high stability is obtained at the same time as making a lower noise. Use the followings for RIAA impedance devise or the main part of the signal system

Use the followings for RIAA impedance devise or the main part of the signal system
1) OXYGEN-FREE gilding lead　　
2) The high sound quality parts have an excellent reputation like High quality Dipped Mica

Use the followings to compose extremely low noise power supply
1) For the power supply circuit; the first recovery diode with higher typicality to avoid speed decrease of recovery
time in a high electric current domain
2) Low magnifying power, high sound quality electrolytic condenser
3) Low noise Zenner diode

Installed the active type subsonic filter circuit
It has been achieved a steady reproduction which quality of an analog disk was not controlled because it is installed the actual active type subsonic filter circuit of cut off frequency 20Hz,40Hz (18dB/Oct). Especially, in setting 40Hz subsonic filter, it is large for the effect of the expansion of the howling margin, so that the analog disk playback environment has been expanded to other than the high end fan class.

[Ｓｐｅｃｉｆｉｃａｔｉｏｎｓ]
Model MM/MC FULL SYMMETRICAL NON-FEEDBACK CIRCUIT
Phono Equalizing Amplifier
CR type MM MC
Input level 2.5mV 0.12mV
Input Impedance 47k Ohm 470 Ohm
Gain 38dB 65dB
S/N ratio in Input -124dBV -144dBV
Maximum Input Capability 125mV(1kHz) 6mV(1kHz)
Output Voltage 200mV(1kHz)
Rear Curve Deviation ±0.2dB(20 to 20,000Hz)
Output Impedance 100 Ohm
Channel Separation 100dB and over（20 to 20kHz：MM/MC both）
Power Consumption 7W(100VAC　　50～60 Hz)
Dimension W 305mm ×H 90mm×D 310mm
Weight 5.1 kg
Input and output terminal Gold-plated terminal
Attachmen AC power cable

[Phase-Tech 소개]

Phase Tech은 Kyodo Denshi Engineering 주식회사에 속한 오디오 브랜드입니다.

KDE는 설립 이래로 회로, 정밀 메커니즘과 알고리즘에서 3대 핵심 기술을 바탕으로 IT 산업에서 신뢰성 있는 측정 장비를 공급해 오고 있습니다.

동사는 이 하이 테크놀리지를 오디오 분야에 적용해 기존에 장비들에서는 실현될 수 없던 음악 재생과 기술 성과를 이룩했습니다.

[Phase-Tech 정책]
사용자가 제품을 가능한 오랫동안 사용할 수 있도록 한다.
오랜 시간이 지나도 개선시킬 필요가 없을 정도로 완벽한 제품을 만든다.
완벽한 소비자 지원 및 제품 AS