HIFI Preamplifier Stereo Adopt AD797 High-end Customized MBL6010 D Black Top-level Preamp

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hifi preamplifier

HIFI Preamplifier Stereo Adopt AD797 High-end Customized MBL6010D Black Gold Edition Top-level Audio System Preamp   Model NO: WHFI-PA6010D     6010 D adopt dual power supply design, the amplifier circuit and control circuit is separately. Electronic circuits for plug-in facilitate future upgrades in addition, output board also use new high-performance...
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HIFI Preamplifier Stereo Adopt AD797 High-end Customized MBL6010D Black Gold Edition Top-level Audio System Preamp
 

Model NO: WHFI-PA6010D

 

WHFI-PA6010D

 

6010 D adopt dual power supply design, the amplifier circuit and control circuit is separately. Electronic circuits for plug-in facilitate future upgrades in addition, output board also use new high-performance amplifier OP, that grade is improved significantly. Each group Output section is driven by a separate output of each buffer stage to enhance driving force, and able to avoid mutual interference. Main circuit of the pre-amplifier is consistent with the original unit parts, materials used in the unit as close to the original material respects with the original unit. MBL6010 D preamplifier has been adjusted to the optimum state, and is available after power on.

 

Adopt a famous op amp AD797 instead of NE5534 of the original unit, and coupled straightly, those AD797 op amps is completely superior characteristics to maximize.

WHFI-PA6010(22l)

Features

1.    AD797 is extremely excellent op amp, and the design for circuit of preamplifier optimized for it.

2.    MBL circuit focused on the details of power supply highly, each decoupling circuit is made of eight different size capacitors alone, namely 220UF, 104 (or 224), 103, and 102. Enable weak audio with different frequencies have been taken full advantage.

3.    Weak audio signal play well with different frequencies completely, also is contributed to six adjustable precision resistors to lead to the unit achieving whole DC, without any isolation capacitors.

4.    Each separated circuit has a separated ground wire. Eliminate grounding together randomly, so as not to affect the degree of separation.

 

Main components selection

 

1. Original ALPS27 type 10K potentiometer

2. Two pairs of gold-plated CMC socket for input and output

3. New and original Op amp AD797 x 4, with 8 pins double row silver-plated sockets.

4. Dual 18V 30WR transformer.

5. Philip s J-level accuracy CBB capacitors.

6. Resistors are used for true accuracy of 0.1% metal film resistors.

7. Electrolytic capacitors have NOVER, Rubycon, ELNA other famous capacitance.

8. Six precision adjustable resistors.

 

WHFI-PA6010(1l)

 

WHFI-PA6010(22l)

WHFI-PA6010(pcba1l)

Adjustment points

 

1.    Magnification Gain of original unit is over 10 times, if that is too large, you can change it to 3-5 times, the first level of feedback resistor is 220 ohms now, you can change it to 470 - 1K ohms.

2.    Power supply adjusted to ± 17V (or ± 15V), and the 4th pin for op amps -17V, the 7th pin for +17 V.

3.    After adjusted the power supply, you can insert a single op amp separately op, the rest is not inserted, adjust corresponding adjustable output (op amp the 6th pin) to 0mV nearly.

 

Product Specifications

1.    Input terminal: RCA × 1

2.    Output terminals: RCA × 1

3.    Power consumption: 30 watts

4.    Input Sensitivity: 350mV

5.    Input impedance: 47k ohms

6.    Frequency response: DC-600kHz

7.    Min. Distortion: <0.0006%

8.    SNR:> 102dB

9.    Dimensions (W * H * D): 280mm * 52mm * 175mm

10. Net Weight: 3kg

11. Accessories

Power cord x 1

 

WHFI-PA6010(L)

 

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