Flagship Headphone Amplifier HIFI Full DC Amp Class A KSA5 Circuit Power Amplifier 8W Output Discrete Component

This headphone amplifier is much layered and extensions, that can realism distinctly and fresh feeling for every note, details, and layer. Its THD + N (THD + Noise) only is 0.00607% @ 1KHz & 300ohm load

Its design is based on KRELL headphone amplifier ksa5 circuit, which should be the most powerful amp circuit for driving force currently. With a gold seal input FET, and output stage used two pairs of ON transistors king NJW15034.15032 (or 15,032.33) with 8A output current per channel, that guaranteed enough low output resistance. Effectively to drive transistor used four small power one in parallel, its benefits are more detailed and better overtone. You can drive those flagship headphones like as HD800 HD650 Q701, and so on. And as a Class A amplifier to use, it has a strong driving force, there are four speaker terminals installed on the back panel, enough to push desktop speakers.

The whole material used are extremely well, everything prepared for the flagship headphones!

How to handle unbalance for left and right channel of your HIFI audio system

How to handle unbalance for left and right channel for your HIFI audio system

Someone had asked our technician what he could do when the audio system happened unbalance for left and right channel.We summarized it the tips as below and hope it help you to solve the problem.

Before checking and adjustment, Please make sure the tubes had been put right position and get well contact between pins of tube and tube bases all.

1. Firstly, please check if the left and right are unbalanced when volume potentiometer is rotated to any positions.

1). only if the time around the beginning of the volume potentiometer, imbalance problem should be caused by the volume potentiometer.

2). If at any position, it is imbalance, it should be other questions.

2. Sitting down / standing up in the middle position of your listening area, does not move (the previous position does not move), so let your families quickly replaced the left and right speaker cables from the outputs of the amplifier to change, the cable ends of speaker do not move temporarily

1). If the same thing happened still, it should be the speaker and cable led to the problem. Then, please exchange the speakers and don’t move cables, if there is an offset for volume, it should be caused by the speaker, and it is probably caused by tremble speaker. If there is no offset, please check the cables.

2). If you replace the speaker cables and it happened, it should be caused by audio amplifier or signal sourcing.

3. At this time, please exchange your RCA signal cable (up and down to exchange)

1). If there is a shift, then it should be the signal source. Please check your audio signal sourcing.

2). If not a shift, then it should be caused by amplifier or signal cable, then please check the amplifier. For tube amp, please exchange the tubes to find out the problem.

4. There is a possible problem is the speaker placement, please try it.

IWISTAO Portable Stereo Bluetooth Speaker

IWISTAO Portable Stereo Bluetooth Speaker

This Bluetooth Speaker build in 2 pcs 3W 2 inch full range speaker units and a passive diaphragm to enhance bass, also build a rechargeable lithium battery.

It is a portable Bluetooth speaker and very popular at that days.

Tape also HIFI

Tape also HIFI 

Tape is also HIFI, enjoy it!

Future road for Bluetooth 4.0 technology combined with NFC

 

There are Bluetooth, NFC, and WIFI for short-range communications technology, and they have their own advantages and disadvantages, but also they could be a leading position in their own expertise areas. However, they are not mutually exclusive, but they could be a complement each other, and it become better solutions or products by mixing together, such as Bluetooth speaker with WIFI plus Bluetooth, or Bluetooth devices with Bluetooth 4.0 plus NFC, it may be develop more convenient and excellent product for user experiencing like as NFC & Bluetooth speakers. So these integrated technologies can also be applied to other fields. With forces of smart mobile terminal widening, it is lifted wireless-related technologies and NFC (Near Field Communication technology) is prevalence. Possibly some people thought, Bluetooth technology which has accompanied the mobile terminal for years somewhat seems eclipsed, it perhaps every dog has its day. However, the biggest advantages of Bluetooth technology still is low power consumption, stable, low-cost, high security, as well as Bluetooth technology has developed a broader category of products in the past years. The market is expecting that sales of Bluetooth products will exceed 32 billion in next five years, as well as a large-scale ecosystems of Bluetooth is expected to get quite fruitful.

Currently, Bluetooth technology has developed to 4.0 version, and compared with the previous version, substantial improvement is transmission of technical specifications, which is better than Bluetooth 2.1 + EDR and 3.0 + high-speed, in particular it solved a problem of large power consumption when devices apply for high-speed transmission applications via Bluetooth, devices can be switched working modes according to different work situations in the new version of the Bluetooth specification. In the Security section, Bluetooth 4.0 version applies a 128-bit AES encryption, and is very suitable for those areas requiring high security using.

As for low power consumption, Bluetooth 4.0 technology has a very low operating and standby power consumption, if using a button battery, Bluetooth 4.0 device can work continuously for several years. If it is able to match energy acquisition-related technology like as solar at that time, I believe it is free to use battery, make mobile devices be more light and thin for product volume. In addition, Bluetooth technology has been widely used in daily life, Bluetooth device is gradually increasing, also it can remove limit of pairing number through Bluetooth 4.0 technology.

It is often criticized by consumers that pairing verification is too complicated in the past, but now this problem has been fundamentally resolved. Bluetooth SIG said that they spotted NFC business opportunities, and has combined Bluetooth 4.0 and NFC technology to provide safe and easy online pairing, so that consumers will pair online those devices which have two functions both when pairing just gently touched, it will be able to start online validation and automatically complete the pairing.

Mostly common devices equipped Bluetooth technology are Bluetooth speakers, Bluetooth headset, and Bluetooth stereo or other AV products. However, with evolution of Bluetooth technology continuously,  it has begun to reach out to individual health and sports products, in the other hand , sensor devices equipped into mobile devices, it will fully meet consumer requirements of health care, sports and fitness, security, entertainment and home automation for Bluetooth Smart sensor applications in the future, as well as a varieties of Bluetooth products open more channels in networking applications, I believe that Bluetooth will occupy a place for development of the Internet of Things in the future also.

There is a Bluetooth 4.0 speaker with NFC as below.

http://www.aliexpress.com/store/product/Free-Shipping-Bluetooth4-0-NFC-Stereo-Speaker-CSR4-0-Instantly-Pairing-Connection-with-NFC-enabled-Smart/725205_1457314484.html

Advantages of Bluetooth 4.0 for CSR --- Compared CSR BC57E68 and CSR8645

Advantages of Bluetooth 4.0 for CSR --- Compared CSR BC57E68 and CSR8645

Bluetooth technology has come to version 4.0. Undoubtedly it becomes a more and more trend or main stream that Bluetooth Speakers or HIFI Bluetooth Audios adopt Bluetooth chips CSR8645. It is a free that the ROM version of CSR8645 which build in a professional codec technology--- apt-x, it a special advantage for industry from cost view. In addition, what are others advantages of Bluetooth 4.0 technology compared with Bluetooth 2.1 technology? WISTAO technology specialized in Bluetooth Speaker and HIFI Bluetooth Audio designing，manufacturing and sale, we summarize it as below , through the charts below, you are able to compare differences between BC57E68 (Bluetunes Rom) and CSR8645, take a look.

Simply speaking, the CSR8645 Bluetooth version 4.0 with the following characteristics

A. HFP version 1.6;

B. AVRCP version 1.4;

C. Support multi-point connection, you can also connect two devices;

D. CVC version 6.0, echo processing is more powerful;

E. Supports voice prompts; supports simple voice recognition;

F. Faster charging;

G. Support IOS power display, can display battery volume of iPhone;

H. Supports AAC-LC and APT-X encoder;

I. Support USB sound card and limited input;

We also provide you the Bluetooth speakers and HIFI Bluetooth Audio Amplifiers based on Bluetooth 4.0 technology, they had been hit market since 2013.

Bluetooth4.0 NFC Stereo Speaker CSR4.0 Instantly Pairing Connection with NFC-enabled Smart Phones Support APT-X

HIFI Bluetooth 4.0 Tube Headphone Amplifier 2x2.5W 16 to 600ohms 6N3 tubes Pre-amp RCA Input HIFI Desktop Amp

HIFI Bluetooth 4.0 Tube Headphone Amplifier 2x2.5W 16 to 600ohms 6N3 tubes Pre-amp RCA Input HIFI Desktop Amp

HIFI Bluetooth Music Amplifier NE5532 Preamp 2SA1941 and 2SC5198 Power Stage Bluetooth 2.1 EDR 2X100W Transistor Amp Support AUX

A cooker modified the song of Hotel California

The video got more than 5 million click at Youku site. The song played by the cooker, and it connected with notebook computer speaker only, but has good performance and effected.If he use a guitar tube as amplifier, it should be more sound effects.

                  Development  Trends of HIFI Digital Audio 

When HIFI Bluetooth audio is concerned, you have to talk about digital audio, and have to talk about HIFI. After passing media changed of records, tapes and CD, we come to the digital age from the analog era. Regardless of how to HIFI analog technology defend tradition, and also regardless of how CD-ROM to defend its territory, they cannot stop the tide of digitization billowing forward. Nevertheless, also HIFI digital creeping forward in the lost, let HIFI fans not know what course to take from assortments of audio equipment, from valuable vinyl equipment to the high price of professional players, from the CD player to DVD, from the PC to your tablet computer, from MP3 to smart phones, from online play to the cloud from the network equipment ...... really dazzling, they are in competition to the last, it seems that computers and smart devices like CD players to get the final approval, which the computer (including the PC and moveable Tablet) to become the highest penetration rate of audio equipment, and the CD drive is the most trusted equipment by HIFI fans. It is the first choice that CD grade and above format of music has become.

CD music is based on the basic principles of the design of the Nyquist sampling theory, human ear can hear sound from 20Hz-20KHz; so it is able to reproduce 20KHz frequency signal if sample rate to take 16bit/44.1KHz, but in recent years Popular 24bit/96-192KHz sampling rate music is super ultimate choice by HIFI audiophile (such a high form of music is difficult to play in CD player). If distortion of CD drive playback music is <0.01%, SNR and dynamic range are is > 100dB, it are high-fidelity music, compared to their original analog tape or vinyl album, noise ratio is improved at least 100 times.

Computer seems to win because of its collection of music files free music storage and management of intelligence, it relies on Internet music resources and then exists. On Internet, now widely popular music format is divided into three broad categories:

(A) Uncompressed Music – CD. Original uncompressed PCM digital music of CD, including WAV/16bit-24bit/44.1KHz-192KHz, which is ripping track of original CD uncompressed file format, a file is 60 minutes 650M , and is a shared format without any copyright issues.

(2) Lossless compression music - APE, FLAC ......, etc., according to rate 1/2 CD compressed files for easy storage and network transmission, compression and decompression without sacrificing the original music details, so 80% network music is this format file, APE is copyright format, FLAC and  others are shared formats.

(3) Lossy compressed music - MP3, WMA and so on. Although MP3 files is smaller, it is based on the loss of detail of the compression music, so that a reproduction sound field cannot achieve full CD quality, cannot meet demand listening of HIFI audiophiles, both have format copyright.

These formats of music is available for free download online popular, but the core of the card-reading system cannot play SD card and U disk or mobile hard disk HD music, only play lossy compression MP3 music format. HD lossless music also relies on a computer or CD drive to achieve replay.

This is why CD player has remnants of a little bit of space still up to now, convenience of computer has been questioned as the source, "CD-ROM is dead" is a foregone conclusion, those major record companies are seeking new distribution methods, where HIFI will go? How to drive high-definition music from your computer and freed, which is the historical mission of HIFI music. WISTAO boldly predicted that a new type of alternative music CD distribution media might be "flash" that is, U disk or SD card, as it is equipped with suitable playback devices, it has all the properties of computer music and CD music both, if add additional features of fast, low cost, and other peripheral attributes, which is sought by HIFI audiophiles is inevitable. This will be a big product system, designed to fully comply with fidelity, fast and low-cost intelligent playback product attributes, set solid tone or a HIFI Bluetooth module receives lossless audio formats, integrated power amplifier IC or discrete components of hi-fi amplifier (or HIFI coaxial speakers) into a system, and equipped with passive speakers, these can be composed of a high-fidelity playback system with designed self-contained, high integration, in one step.

http://www.aliexpress.com/store/product/Free-Shipping-2x40w-HIFI-Digital-Amplifier-Stereo-TDA7498L-Support-APE-FLAC-WAV-CUE-SD-Card-U/725205_1495639701.html

Excellenct Online Shopping Experiences from WISTAO HIFI BLUETOOTH AUDIO MALL

Excellenct Online Shopping Experiences from WISTAO HIFI BLUETOOTH AUDIO MALL

WISTAO HIFI BLUETOOTH AUDIO MALL is specialized on small order wholesales and B2C business from aliexpress,it is e-commerce platform of WISTAO TECHNOLOGY, which is  specialized in Researching and Deigning electronic consumer products from customer’s view and industrial trends through marketing researching and survey, especially in HIFI Audio and Bluetooth audio product like as portable Bluetooth speakers, HIFI Bluetooth speakers, HIFI Bluetooth acoustics, and HIFI tube Bluetooth acoustics as well.

And the platform support online payments for example your cridet card, or through ESCOW of aliexpress.Also, the e-commerce platform specialized on selling HIFI Bluetooth accoustics, Bluetooth speakers,Bluetooth earphone,HIFI Bluetooth audio amplifiers and HIFI amplifers including to tube preamplifiers,tube earphone amplifier,tube amplifier, large power transistors amplifiers, integrated circuit amplifiers,phono amplifiers, and so on.

We provide you high quality, cost effective products and services for safety payment, quickly shipment, welcome to visit our online store, click WISTAO HIFI BLUETOOTH AUDIO MALL

For shipment, we provide more ship routes worldwide from Shenzhen, China, you can select internation express such as DHL, Fedex, UPS, TNT, or also select economical channels like as air post or parcels if the the needs isn't very urgent,that is a good choice. Specially, we are able to deliver the parcels to all Russian Federation through Russian Special Routes, which is high effective and promtly.

More information, you can visit our official website .

What Is a Phono Stage Amplifier?

WhatIs a Phono Stage Amplifier?

Playing vinyl records isn't as easy as it was back in the day, while MP3 and CD formats dominate the current audio marketplace; vinyl records remain popular among collectors. Many claim that vinyl sounds better than digital formats, while others simply own records that they still enjoy. Many of today's lower priced stereo receivers are not adequately equipped to power a turntable. Because modern electronic technology is different from the technology used to create vinyl records, a phono pre-amplifier is required to enjoy them.

To add a turntable to such an audio system, a user must use a specially-designed phonograph preamp also known as a phono stage. For those with vintage vinyl collections a turntable, a phono pre-amplifier and a receiver are required to fill a room with the sounds of record albums.

The magnetic cartridge in a turntable has a lower output than that of line level audio sources like CDs and tapes. A phono preamplifier boosts the volume from a turntable to equal the line audio. Older systems usually have a phono preamp built-in, but many newer units require users to purchase one separately.

To reduce background noise and sibilance, LPs have an equalization curve that boosts higher frequencies. Reversing this equalization, known as the "RIAA curve," returns the music to its original frequency. Unlike other preamps, which amplify this sound, a phono preamp will nullify it. Good-quality phono preamplifiers have a high signal-to-noise ratio, and will correctly adjust RIAA equalization.

But it may be difficult that how to connect a Phono Stage Preamp to a Turntable for the newers, there some steps as below.

1.    Locate the left and right stereo output jacks on your turntable. Also locate the stereo input jacks on your phono stage preamp.

2.    Place the turntable and phono stage preamp where they will be when in use. Ensure that the turntable is located on a level surface. Avoid placing the turntable on top of speakers or anything that may generate heat.

3.    Use the measuring tape or ruler to determine the distance between the output jacks of the turntable and the input jacks of the phono stage.

4.    Ensure that your stereo interconnect cables is at least as long as the distance measured in step three. If you do not already have the interconnect cable, choose one that is long enough to span this distance without strain. If you will need to pull either the turntable or preamp out of its location in order to access its connectors, choose a cable long enough to allow for movement of the components.

5.    If there is a Turntables ground, it will be connected with phono amplifier ground interfaces, just very simple.

6.    Power up your receiver, turntable, and phonograph stage. Select the appropriate audio source on your receiver, drop the needle to your record on the turntable, and enjoy the music.

There is two phono amplifier as link shown, more details, please click them.

HIFI MM Phono Stage Amplifier for Electric Gramophone with Ceramic Package AD847AQ plus AD712JN Attenuated RIAA Circuit

HIFI MM Phono Stage Tube Amplifier for Electric Gramophone with 2x12AX7 RIAA 2 Negative Electrode Feedback Dedicated (MKP) Black

What Is Single Ended Class A Tube Amplifier?

What IsSingle Ended Class A Tube Amplifier?

Audio amplifiers in mass production typically use an integrated circuit to amplify the audio signal. Even though modern audio amplifiers reproduce audio signals with less signal distortion than their predecessors, some audiophiles prefer the "warm" tone a tube amplifier produces when it reproduces an audio signal. Except integrated circuit to amplify, many audio and power amplifiers sold for personal and commercial use contain electronic devices called transistors. Transistors came about as an intended improvement upon an older technology—the vacuum tube, used as an amplifier component since the early 1900s.

One common type of vacuum tube - the triode - is commonly used to create tube amplifiers. A triode is so named because it has three electrical connections: the grid, the plate, and the cathode. A triode can receive an alternating current - or AC - signal through the triode grid connection, and can amplify the signal by application of direct current - or DC - electrical energy across the triode plate and cathode connections. A Class-A amplifier operates at an efficiency level between 25 and 50 percent. Therefore, a triode-based Class-A amplifier requires a high-voltage (100-volt or more) DC power source to provide power to the amplifier. Unlike transistor-based Class-A amplifiers, a triode-based amplifier also requires a separate direct-current (DC) power supply for a cathode heater. Without the cathode heater activated, a triode-based amplifier will not work.

While many transistor-based amplifiers are capable of reproducing and amplifying a signal without noticeable signal distortion, some audiophiles prefer the slightly distorted signal that a tube amplifier provides.

There are two types of tube amplifier output circuit: Push-pull output circuits that are wired so that the output current is split and runs in parallel, the other is single-ended output stages that are not split and run in a linear fashion. Single-ended tube amplifiers can generate more power from less current. Single-ended tube output circuits are used in both audio and instrument amplification. There is less distortion in a single-ended amplifier because the output currents do not cross over.

A high cost effective and high quality single-ended tube amplifier had been hit the market by WistaoTechnology since two years ago. There are several models to be selected for customer. They are Class A, pure tubes amplifier, whose pre-amplifier adopt 6N3J tubes, and power stage adopt EL34B tubes, also its rectifier adopt 5Z4PJ tube, and the chassis is made of traditional black or Mirror Stainless Steel with silver. More details, you can visit the links:

Single-ended Pure Class A Tube Amplifier 6N9 preamp tube EL34 power amplification 5Z4PJ Rectifier (Model: WVT2016) with traditional black.

Single-ended Pure Class A Tube Amplifier 6N9 preamp tube EL34 power amplification 5Z4PJ Rectifier (Model: WVT2016)

Lighting of Single-ended Pure Class A Tube Amplifier 6N9 preamp tube EL34 power amplification 5Z4PJ Rectifier (Model: WVT2016)

Single-ended Pure Class A Tube Amplifier 6N2J Preamp EL34 Power Amp 5Z4PJ Rectifier with Mirror Stainless Steel Chassis Silver (Model: WVT2018)

Single-ended Pure Class A Tube Amplifier 6N2J Preamp EL34 Power Amp 5Z4PJ Rectifier with Mirror Stainless Steel Chassis Silver (Model: WVT2018)

Application of Single-ended Pure Class A Tube Amplifier 6N2J Preamp EL34 Power Amp 5Z4PJ Rectifier with Mirror Stainless Steel Chassis Silver (Model: WVT2018) by customers

Application of Single-ended Pure Class A Tube Amplifier 6N2J Preamp EL34 Power Amp 5Z4PJ Rectifier with Mirror Stainless Steel Chassis Silver (Model: WVT2018) by customers

History of Tube Amplifier

History of Tube Amplifier

Before transistors were invented in 1947, all amplifiers ran off of vacuum tubes. The invention of the simple valve or tube is credited to John Ambrose Fleming, who created it while working for the Marconi Company in London, 1904. It was called the diode due to its dual electrode structure, which conducted electricity in one direction only. Lee De Forest then added a third electrode, creating the Triode, which he called the "Audion." It was the first electronic amplifying device. Its first audio application was boosting the signal of telephones. In the 1950s, valves began being used for music (and later TV) amplification.

WISTAO HIFI Tube Amplifier WVT2012

In the early days of the electric guitar, general-purpose audio amplifiers were used. But as the instrument grew more popular, specialized tube guitar amplifiers were designed. In the 1960s, as rock and roll became the dominant popular music, manufacturers experiment with many different types of tube amplification, seeking variations in tone and greater flexibility of volume and gain (the signal drive which creates distortion). Many different types of tubes were used, with many different characteristics; some types included KT66, EL34, and KT88. EL34 and KT88 tubes are still in production today.

Tube EL34

Pins of EL34

Tube amplified sound is generally considered to be superior and preferable to transistor amplified sound, especially for the electric guitar. The tube sound is generally much warmer and more organic sounding than solid-state. Tube amplifiers are also far more responsive to the dynamics of a guitarist's playing (how hard she hits the strings). Tube amplifiers, when played hard, produce some desirable grit that solid state amps do not. The tube amp is the easiest way to get a classic sound out of your guitar.

The main drawbacks of tube amplification are expense and durability. Tube amplifiers are much more expensive than solid state amplifiers, as solid state transistors are much cheaper to produce than tubes. Guitarists' demands for the more "authentic" sounding tube amps also drive up the price. Tube amps are also more fragile than solid state amps (the tubes can break) and are sensitive to heat and cold where solid state amps are not. Tube amps are also much heavier than their solid-state counterparts.But with process development of tube manufacturing, its durability has been improved significantly and working time is up to ten thousands hours or above. Also the manufactures are able to provide cheaper tube amplifier with high quality.And, a protective shield is added to amplifier for pretect the tubes.

The WISTAO is one of the most popular tube amplifiers. It has a clear, chiming, clean sound, and sounds particularly pristine when paired with a guitar. The Twin is a combo amp, in that its tube amp circuitry is housed in the same cabinet as the speakers, with the tubes hanging down in back. WISTAO is a company that makes a number of excellent tube amps that are more affordable.

There is a  tube amplifier with pure tubes, which adopt 2pcs 6N3 tube as preamp, 2pcs EL34B as power amplifier, 5Z4 as rectifier. The unit adopts horizontal design, compact structure, symmetrical and reasonable layout, fine workmanship, and matched with special tube shields, which is overall elegant, dignified.

WISTAO  Tube Amplifier 6N3 * 2 preamp EL34 * 2 Power Amplifier 5Z4 Rectifier SRPP Circuit Pure Tube Amplifier 2 X 8W

Lighting of WISTAO HIFI Tube Amplifier 

Internal circuit adopt tube rectifier, 6N3 tubes are used as pre-amplifier whose sound is very sweet, and using well-known classic SRPP circuit connection; Power amplifier adopt two EL34B tubes, strong driven, transparent sound, higher resolution , rich tubes style.150W power supply transformer

Protective shield of the tubes 

The  tube amplifier has two inputs, and a signal input switch on front panel beside volume control; two groups of 4 or 8 ohm output is six large copper gold-plating terminals with crystal cover; power input with 110V/220V dual power input selection, let the machine be widely able to use in different countries, different supply voltages to meet different needs.

Back view of WISTAO Tube Amplifier 6N3 * 2 preamp EL34 * 2 Power Amplifier 5Z4 Rectifier SRPP Circuit Pure Tube Amplifier 2 X 8W

If you like it, please click WISTAO Tube Amplifier 6N3 * 2 preamp EL34 * 2 Power Amplifier 5Z4 Rectifier SRPP Circuit Pure Tube Amplifier 2 X 8W

The product specifications is below.

1. Rated output power: 8W + 8W

2. Frequency response: 20Hz-25 KHz

3. Total harmonic distortion: <1% (@ 1KHz)

4. Input Sensitivity: 500mV-2000mV

5. Input impedance: 100K ohm

6. Output impedance :4-8ohm

7. SNR: ≥ 88dB

8. Size (W * H * D): 360mm * 180mm * 260mm

9. Weight: 11.5kg