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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)

about shipping

1. Worldwide Shipping (Except some countries).

2. Orders processed timely within 3~5 business days after the payment verification. 

3. We only ship to confirmed order addresses. Your order address MUST MATCH your Shipping address.

4. The images shown are not the actual item and are for your reference only.

5. SERVICE TRANSIT TIME is provided by the carrier and excludes weekends and holidays. Transit times may vary, particularly during the holiday season

6. We supply 4 kinds of shipping services as below

A. Expedited Shipping: DHL, UPS or Fedex. For faster shipping and smooth transaction, we will change the shipping company among them.  Estimated Delivery Time: 3~7days

B. Standard Shipping: EMS, eParket (US available) or DHL Global Mail (Germany available only) Estimated Delivery Time: 3~7days

C. Economy Shipping: China Air Post Mail / Parcel, Hongkong Air Post Mail / Parcel, Sweden Post, etc.Estimated Delivery Time: 15~60days

D. Special Routes: Russian Special Route, Estimated Delivery Time: 30~ 40days;

                                   Australian Special Route, Estimated Delivery Time: 10~ 15days;

Import duties, taxes and other customs related charges all are not included into shipping cost . Buyers bear all responsibility for all extra charges incurred (if any).

return & refund

We will check the item carefully and make sure the quality before shipment. If some unexpected problems happened, please contact us firstly.If it is quality problem, buyer may submit argue within 7days after receiving the item, buyer must provide photos , video and other evidences to seller for identify. Man-made damaged, buyers take full responsibility.

1) .The buyer return us the goods and responsible for return shipping costs; after we receive the goods ,we will send a new product to buyer and pay for the resend shipping cost.

2) .If the goods (total price including shipping is less than 10USD) has quality problems, we will resend a new product in buyer next order; if buyer don’t plan to make a new order in the near term, buyer can pay the resend shipping cost and ask to resend a new product. 

3). Due to the taxes problem, buyer refuse to receive the goods, buyer need to be Responsible for freight out and home.

about guarantee

1. One year Manufacturer`s limited Warranty for defective items (excluding items damaged and/or misused after receipt). Accessories come with a 3-month warranty.

2. Defective items MUST BE reported and returned within the warranty period (with the original packaging, if possible). You must tell us what the defect is and give us your order number. WE DO NOT REPAIR OR REPLACE ITEMS WITH AN EXPIRED WARRANTY. You agree to all of the above-listed policies upon ordering on aliexpress.

about feedback

We maintain high standards of excellence and strive for 100% customer satisfaction! Feedback is very important. We request that you contact us immediately BEFORE you give us neutral or negative feedback, so that we can satisfactorily address your concerns. 

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