Why don't you use Splitted Phono Amplifier Stage?

Why don't you use Splitted Phono Amplifier Stage?

What is an advantage for Splitted Phono Amplifier Stage? It can maximize to eliminate the mutual interference between phono amplifier and power supply. 

So we designed and manufactured it, that  is a well-designed  HI-END vinyl phono stage that adopt a splitted power supply,although its appearance is not luxurious, simple and elegant, it has itself style. Most of the RC components for the phono amplifier used are imported one, the circuit layout is reasonable with sophisticated technology and process, double-sided fiberglass PCB, power supply board is a signal sided, and its multiple-stage amplification gains and impedance matched are adjustable.

MM/MC Phono Amplifier Stage Splitted Power Supply LME49990MA + Transistor / FET

MM/MC Phono Amplifier Stage Splitted Power Supply LME49990MA + Transistor / FET

Back View -- 

MM/MC Phono Amplifier Stage Splitted Power Supply LME49990MA + Transistor / FET

Inside View -- 

MM/MC Phono Amplifier Stage Splitted Power Supply LME49990MA + Transistor / FET

Features

1.    Real low noise;

2.    Perfect combined high-performance and low-noise op amps with transistors, it has outstanding performance at high frequency extension, dynamic, great sound field;

3.    Used a lot of imported high-quality HIFI components.

4.    Dual application to MM / MC, it has 8-speed adjustable gains and input impedance

5.    The first stage used American National's reference op amp LME49990MA, and the second stage is transistor / FET output circuit, which is low output impedance and strong driving force.

6.    Splited designing, display flexibility and small size.

Production Specifications

1. LME49990MA as the first and transistor / FET output circuit as the second stage.

2. Has 8-speed adjustable gains and input impedance

3. Copper gold-plated RCA input and output jacks

4. Seperated power supply.

5. Attenuated MM / MC phono amplifier.

6. Input voltage: AC 220V / 50Hz

7. Dimensions (L * W * D): 106 mm * 40 mm * 85 mm ( for 1 piece)

8. Weight: 1.95 KG

9. Accessories

     Power adaptor x 1

     Power connection cable x 1

More details, please visit http://www.aliexpress.com/store/product/MM-MC-Phono-Amplifier-Stage-Splitted-Power-Supply-LME49990MA-Transistor-FET-for-LP-Phono-Vinyl-Amp/725205_32524994878.html

Using Caution for Phono Amplifier (Model No: WMMC-PA2011)

This MC/MM phono amplifier is made of high quality imported components and parts, and tuned finely, as well as aged 10 hours above. After connecting the cables as the marked on the panels, it will work.

1.    Built-in the switch for changing MC/MM, MC gain and impedance input control inside, please set up it as your requirements as below. (it can be set up when it works).

Switch combination of gain				Switch combination of input impedance
1	2	3	Gain	4	5	6	Impedance
OFF	OFF	OFF	100(MM)	OFF	OFF	OFF	47K
OFF	ON	OFF	500	OFF	OFF	ON	150
ON	OFF	OFF	800	OFF	ON	OFF	100
ON	ON	OFF	1000	OFF	ON	ON	60
OFF	OFF	ON	1200	ON	OFF	OFF	30
OFF	ON	ON	1500	ON	OFF	ON	25
ON	OFF	ON	1800	ON	ON	OFF	23
ON	ON	ON	2000	ON	ON	ON	20

Note: the unit had been set up as MM default when shipment.

Remark:

1). L / R channel will be set up with same when you set up them.

2). When you set up the gain and the impedance according your requirements, please open the top cover of the amplifier ( unscrew 4 pcs screws on the front and back panel, then you take the cover out).

2.    GND wire terminal of phono amplifier must be connected with the ground wire of phono player, which is shielded ground wire of phono for anti-interference, eliminating low-frequency noise. After the ground wire of phono player connected with GND wire terminal of phono amplifier as figure below, then connected audio cables of input and output between them.

3.    The phono player and phono amplifier are vulnerable to interference, so they need to try to stay away from sources of interference, such as amplifiers and other fields are generated with a transformer and objects.