Monday, April 18, 2016

6P6P Class A Signle-ended Tube Amplifier with retro-style bamboo-wood cabinet

Tube 6P6P or 6V6 is specifically designed and developed power output tube for the audio field, sound performance had been proved since it hit market, whenever savored carefully, nostalgic thoughts immediately felt.

Make this power amplifier is based on the classic circuit of 6p6p (6v6) power tube, and we select HIFI components and parts to create this Class A single-ended tube amplifier with traditional scaffolding soldering process by manual, sound satisfactory by users, we would like to share it with all fans! Also with all retro-style bamboo-wood cabinet, it is not only solid and durable, but also easy to perfect match with wooden speaker.


6J1 to drive 6P6P

6J1 to drive 6P6P

Traditional scaffolding soldering process by manual

6J1 to drive 6P6P + parallel dual 6z4 tube rectifier

6J1 to drive 6P6P + parallel dual 6z4 tube rectifier

Lighting

retro-style bamboo-wood cabinet perfectly match with wooden speaker



Features


  1. Tubes adapted new production inventory of Shanghai, Beijing, Shuguang, and their parameters have been detected and paired accordingly when assembly, which ensures the balance of the left and right parameters!
  2. Adopts BC HIFI coupling capacitors, and gold-plated speakers terminals, high-quality 100k double volume Potentiometer.
  3. Its single-ended output transformer (5 kilohms: 4 ohms: 8 ohms) is specifically tailored oriented for this power amplifier, especially in the design of the output parameters according tuning sound method, which lead to it is a unique skill to reproduce human voice.


Specifications (for WVTA-6P6P(S))

1. Rated Output Power: 2 x 4.8W
2. Frequency response: 20Hz-20 KHz
3. Total Distortion: 1% (@ 1 kHz)
4. Input sensitivity: 500mV-- 2000Mv
5. Input impedance: 100k Ohm
6. Output impedance: 4 or 8 Ohm
7. Signal to Noise Ratio : > 89 dB
8. Amp Size (W * D * H): 350 mm * 230mm * 20mm
9. Colors: as photos showed
10. Weight: 5.4kg







Sunday, April 10, 2016

What is HIFI RCA Cables?

What is HIFI RCA Cables?

RCA connectors are most commonly used on stereo equipment. In Power Amplifier systems they’re often used to connect a stereo CD player or other consumer electronics devices to the preamplifier board. They’re also used with the aux and tape inputs and outputs. RCA” is derived from the Radio Corporation of America, the company that introduced the design in the 1940s. RCA connectors are also sometimes referred to as “phono connectors” since they’re used to connect turntables.

At the market, there are a lot of RCA cables like as RCA to RCA, 3.5mm phone jack to 2-RCA cable, and so on. The common RCA cable made of plastic overmolding rather than pure copper RCA connectors. They usually consist of a pair of wires molded together with separate ends color coded for left and right channel in stereo devices.

However, HIFI RCA cable is made of pure copper RCA connecters which are made of copper-plated plug generally, copper shell, and advantages of copper shell can be shielded from external interference and a pair separated OFC wires cable instead of a pair of wires molded together, and then assemble them though soldering with high quality solder. This kind cables offer excellent sound quality for audio and home theater applications, provide maximum sound performance compared to ordinary audio cables. OFC Copper wires provide optimized audio clarity. Pure copper conductor shielding offers protection against noise and interference. The color-coded connectors of the cable allow the users easy installation and identification. Gold-plated, heavy-duty connectors ensure long lasting, corrosion-free connections. RCA Audio/Video cables are used to connect the composite audio signal from the left and right channels on home theater equipment as well as the video signals.

The familiar HIFI RCA cables is two-tailed with one red and one white tail on each end, though some cables might substitute black for white. Many RCA cables have a third yellow tail to deliver a composite video signal. The cable connector is a male push-in, with a thick central pin surrounded by a thicken wall, rounded collar or crown. RCA cabling can also deliver component video signals.

The tails of an RCA cable are color-coded to correspond to the proper input or output jack on electronic equipment. Red tails or black tails connect to the right channel inputs/outputs, while white tails are used for left channels. In reality both wires are exactly the same, so switching colors makes no difference, but it is important that the same color be used for the same channel at each end of the cable. Since “red” and “right” both start with an “r,” it’s an easy way to remember how to connect the cables in a consistent manner, even on components without color-coding.

Much emphasis has been placed on the types of cables used to connect components and the ability to deliver signals without introducing interference. In some cases companies charge enormous amounts of money for cables that are supposed to deliver superior performance. Some of these cables have large, intricately designed molded heads and flashy packaging that necessarily figure into cost but not necessarily performance.

One generally accepted myth is that gold tips or connectors are always superior to silver. While gold does not conduct sound any better, it is non-corrosive and more malleable than silver, which could be an argument for buying gold-tipped plugs for applications where the plugs will be left in place. If the cables will be used in a patch bay where they will be plugged and unplugged often, silver tips might actually be a better choice than soft gold plating that can wear away.

A typical run of up to 10 feet (~3m) does not require an expensive audio RCA cable, though the cheapest possible cable — the type included with many electronic components as a freebie — might not be the best choice. Even still, the average person probably wouldn’t notice a difference between this RCA cable and another. Speaker wire gauge and type has a greater ability to make a discernible difference in audio, all else being equal, than the RCA cable. Choosing a modestly priced cable should do the trick.


HIFI RCA Cables

HIFI RCA Cables

Budweiser RCA connectors 

Budweiser RCA connectors

copper-plated plug, copper shell
 Canare professional broadcast audio cable
Canare professional broadcast audio cable

 Section of Canare professional broadcast audio cable


There is HIFI RCA cable with Canare professional broadcast audio cable and Budweiser RCA connectors as features below.

1. Used Budweiser RCA connectors by U.S, which is made of copper-plated plug, copper shell, and advantages of copper shell can be shielded from external interference.
2. Used Japanese origin Canare professional broadcast audio cable, and commercial grade products don’t achieve its performance, more than 94% of the copper network density to ensure effective shielding of electromagnetic noise. 40 each of the wires from the particular fine 0.08mm copper wire twisted together, particularly good durability. This is Canare send technical application structure model of work, it is a good choice for a lot of HIFI audiophiles to change the cables, its analytical abundantly clear, very good reputation, reliability and durability than ordinary wire several times stronger than the above, cheap affordable, high cost.
3. Used genuine Akihabara 99.99% high purity oxygen-free copper audio signal lines, each line adds four core nerves, its main role restore audio fidelity sound field, so the lossless transmission of audio signals have sufficient safeguards . General transmission line signals of different frequencies have different impedances, this feature on the sound reduction performance of sound vague, production people do this out of the high-end speaker cables called intelligent signal line characteristics of this line the signal level of the frequency is divided into two channels, 5KHZ more signals transmitted by a special material nerves, 5KHZ outer following signals through the transmission line, which greatly improves the frequency characteristics of the transmission line, the reproduction of clear and transparent sound.
4. Use containing 3% silver Senju solders soldering.
5. External plus a network of high-density shock as protection.
6.  It is made by manual.




More detail please visit  HIFI RCA cable





Friday, April 1, 2016

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



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 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.