Liang Zhu from IWISTAO 2X40W FU29 Pull Push Vacuum Tube Amplifier

Liang Zhu from IWISTAO 2X40W  FU29 Pull Push Vacuum Tube Amplifier 

"The Butterfly Lovers Violin Concerto"  often abbreviated as "The Butterfly Lovers" or "Liang Zhu". 

We played it with FU29 pull-push vacuum tube amplifier.

This FU29 vacuum tube named FY29 in Russian, and named 829B in American. It is a composite vacuum tube in which two Cambodian tetrodes are packaged in a same glass shell. It is generally used in power amplifiers with push-pull output, which can reduce tube selection and matching trouble. FU29 filament voltage is 6.3V, current is 2.25A, screen voltage is 600V, curtain grid voltage is 200V, zero letter screen current is 40mA, full letter current is 110mA. The grid bias voltage is -18V, the optimal load impedance from the screen to the screen grid is 13750Ω, and the output power (effective value) reaches 44W when the signal is full.

In order to further simplify the circuit, this unit uses a composite tube 6N2 for preamplification and phase inversion, so that a single channel can use 6N2 and a FU29 to complete the power amplifier task, and it has 40W power output. It is small in size, unique in shape, but strong in driving force. Do not use the power of general transistors or digital power amplifiers to analogize the actual driving force of this tube power amplifier, because the high supply voltage and unique output transformer’s structure, its output internal resistance change for high and low frequency signals is relatively small, and it has a good low frequency driving ability. And the sound is soft and smooth, warm and delicate. This is why the tube amplifier has not been completely replaced after the emergence of many new technologies.

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IWISTAO 2X40W Vacuum Tube Amplifier Pull Push FU29 Power Stage 6N2 Preamp Bluetooth 5.0 Whole Aluminum Chassis

Enjoy CD-level Quality Sound with Wireless Bluetooth Connectivity

Enjoy CD-level Quality Sound with Wireless Bluetooth Connectivity

The new CSRA64XXX ROM series audio platform is designed for entry-level and mid-range Bluetooth speaker devices, bringing a new level of sound quality and functionality. It will be seen in the Bluetooth speakers, wireless headset, car audio, wireless hands-free products.

Bluetooth Tube Audio With CSRA64215

The audio platform supports Qualcomm's unique audio technology, including TrueWireless Stereo wireless stereo technology, cVc noise reduction technology, the sixth generation CVC voice enhancement technology.

The top model "CSRA64215" also supports aptX audio technology that provides CD-level sound quality with Bluetooth connectivity, as well as aptX low latency technology that can listen to aptX quality audio while watching video. "CSRA64210", "CSRA64110" are facing stereo, mono Bluetooth speaker equipment, suitable for high-cost effective products.

Three are built-in 16-bit stereo codec, digital-to-analog conversion SNR 95dB, support for Bluetooth 4.0 + EDR standard specification, Support A2DP 1.3, AVRCP 1.5, HFP 1.6 (including WBS / mSBC), HSP 1.2 and other related agreements, the effective distance of 10 meters.

There are some products that built in Bluetooth module with CSRA64215,whose actual listening experience is excellent.

It is a desktop Bluetooth tube amplifier, and will be better if it matched a pair high sensitivity speakers.

Tube Amplifier Wireless Bluetooth 4.2 Single-ended Class A Desktop 6N2 Preamp 6P1 Power Stage 2x3.5W APT-X

Or, you can us a Bluetooth 4.2 Decoder to refresh your old amplifier to enjoy CD level quality sound with Bluetooth connectivity. It is a Bluetooth decoder with Bluetooth 4.2 CSR64215 and DAC ES9023. The Bluetooth 4.1 version CSR64215 implemented   digital signal transmission thought wireless function, the digital to analog conversion of audio output used a professional decoder chip ES9023 to play that the digital signal is decoded into an analog audio signal.

IWISTAO HIFI Bluetooth 4.2 Decoder Stereo CSR64215 DAC ES9023 Hardware Decoding APT-X

If you need the Bluetooth decoder with CSR8670, you may find here.They are Bluetooth decoder with Bluetooth 4.0 CSR867 and DAC AK4490. The Bluetooth 4.0 version CSR8670 implemented   digital signal transmission thought wireless function, the digital to analog conversion of audio output used a professional decoder chip AK4490 to play that the digital signal is decoded into an analog audio signal, and finally OP amplified the analog audio signal and output it.

IWISTAO HIFI Bluetooth4.0 Decoder Stereo CSR8670 32-bit DAC AK4490 Hardware Decoding Bluetooth Optical Inputs PCM & DSD APT-X

IWISTAO Earphone Amplifier HIFI Solo with Bluetooth 4.0 CSR8670 32-bit DAC AK4490 Hardware Decoding Optical Inputs APT-X

2 x 25W HIFI Bluetooth digital power amplifier with Bluetooth 4.0 CSR8635 Placying CD Level Music

Have you looked for a Bluetooth Amplifier without cable connection? You may only use wirelessBluetooth connection through your Bluetooth enabled devices, this one will be a better choice.

Specially, it built in CSR8635 Bluetooth module, that adopt Bluetoth 4.0 technology. And you can enjoy CD level music once connected with you smart phone and play lossless traces, like as WAV, FLAC, AFAC, APE format music...

As a desktop amplifier, output power of this HIFI Bluetooth 4.0 digital amplifier is  2 * 25W stereo with whole aluminum enclosure, matte oxidation process; Adopted customized advance air core inductors to improve the LC filter of digital amplifier, which is the most important aspects for digital amplifier, Adopted 3300uf BC-048 filter capacitor as a reservoir with internal shun in order to meet the power needs bursting to solve problem of partial handsome voice for switching power supply;

Also it built in speaker protection and power-delay circuit, so there was no impact sound switch and protect your valuable speakers; 

Specifications of this HIFI Bluetooth digital power amplifier as below.

1. Signal input: Bluetooth 4.0 + EDR; RCA line input
2. Work type of amplifier: Class D
3. Working efficiency: about 88%
4. Quiescent current: 50mA
5. Rated output power: 2 * 25W
6. Frequency response: 20Hz to 20KHz
7. THD: 0.09% (@ 1W)
8. Output impedance: 4 / 8Ω
9. Working voltage: DC9V to DC15V

More details, please find http://www.aliexpress.com/store/product/Free-Shipping-HIFI-Bluetooth-digital-power-amplifier-PAM2021-2-x-25W-Bluetooth-2-1-EDR-RCA/725205_1314318116.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

Wistao Mini HIFI tube Bluetooth audio hit market

Wistao Mini HIFI tube Bluetooth audio hit market

In era of achieving simplified designing, it is increasingly simple that product appearance of design such as traditional product of iPhone design,but some necessary functions have been added to products to better facilitate consumers. Wistao Technology, adheres his belief of Convenience Life with Wireless, introduced a HIFI Vacuum Tube Bluetooth audio to markets.

This HIFI Vacuum Tube Bluetooth audio, adopted Hybrid designing with preamp 6N1 tubes, and amplifier using high-power integrated power amplifier IC. It combines mellow beautiful sound quality of tubes and high power output of the IC. Its maximum power is up to 2 x 28W, and it’s enough to meet your listening needs. Its High gloss panel design, tubes is gleaming under transparent protective shells, also mirrored to be ablaze by high gloss panel. Simply to design its switch also, you can choose to use Bluetooth signal input or RCA line input, and you adjust speaker volume through control right volume knob easily. Two kind colors of product are available, black and white. Rear of this tube amplifier had been set up two models of power supply switch, 100V/50Hz-60Hz and 230V/50Hz-60Hz available for switching, basically it can meet electrical environment around the world..Gold-plated output interface within the rare, coupled with HIFI copper wires, so you will not miss every detail of the music.

Not only is it suitable for enjoying classical music, but also for enjoying popular music. We selected a lossless audio of "Hotel California" to test this HIFI Vacuum Tube Bluetooth audio, its performance is also remarkable, motorized sound of a motor roar away from left to right to present accurate positioning of sound field, such as a motorcycle truly over from your sides, bass performance is its strength, sound of drums blow, clank to your ears, human voice is still clear ...

More detailed information about this model, please visit Wistao Technology website, http://www.wistao.com/en/products_show.html?740

Sound of nature -- Wistao NFC Bluetooth 4.0 HIFI Bluetooth acoustics hit market, wireless HIFI come from here!

Sound of nature -- Wistao NFC Bluetooth 4.0 HIFI Bluetooth acoustics hit market, wireless HIFI come from here!

It has been used in high-end Bluetooth stereo that CSR's Bluetooth 4.0 chip with apt-x Professional codec technology widely, and become a trend in wireless HIFI acoustics. Recently, Wistao Technology released a pair of separated HIFI tube Bluetooth acoustics, and two HIFI Bluetooth speakers which based on CSR Bluetooth 4.0 technology and apt-x decoding all. For both Bluetooth speakers, one is a 2.0 channel stereo HIFI Bluetooth speakers, the other is an integrated desktop HIFI tube Bluetooth acoustics.

These HIFI Bluetooth acoustics are two-channel stereo output, adopt CSR Bluetooth 4.0 technology, and support CSR apt-x professional decoder. All cabinets of HIFI Bluetooth speaker is made of high quality MDF (medium density fiberboard); separated HIFI tube Bluetooth acoustics and integration Desktop HIFI tube Bluetooth stereo, whose preamplifier is made of tubes, and their out power are from 2 X 25W to 28W, fully to meet the demand for enjoying music indoor . Cabinet of speaker are designed and tuned by professional engineers and its circuit is completed to adjust by the UK experienced engineering team in order to make sure it more perfect sound quality, let you enjoy HIFI music. Overall feeling is, that surging tide of audio sound, powerful bass, treble highly resolving power, and human voice being rich sense of the scene, accurate sound field positioning, like a "good voice" singer standing in front of you…... In addition, all models above can be built-in NFC chip as an option, so you don’t need to open the Settings menu of smart mobile terminals, and can quickly achieve Bluetooth pairing, greatly enhancing users’ experience.

And if you download and install a lossless music formats player (such as WMA, AAC, FLCA, AIFF, etc.), it will achieve to reproduce HIFI music with a wireless way .Due to adopting Apt-x professional audio decoding technology, its performance will be strived for further improvement to compare with normal speaker, or even pull away, and easily to achieve CD-quality sound.

Main characteristics of CSR APTX audio codec technology is low-power, low-latency (when sampling frequency is 48 kHz, it is less 2 ms), fault tolerance (When BER <1:10,000 perfect to regenerate), high-quality, etc. Its high sound quality is main reflected in frequency response range of 20Hz-22kHz, supporting 16bit, 24bit audio, sampling frequency up to 48kHz, dynamic range in 16bit> 92dB, 24bit > 120dB, but sound basis of dynamic range is 96dB for minimum sample rate of 44.1kHz CD-quality of 16bit stereo (entry-level quantization bits). From comparison above data of apt-x, we can draw a conclusion that it is not difficult to see how it reach and exceed t CD quality. It can break through the barriers of bandwidth with Bluetooth connection to transmit excellent reproduction of stereo sound with CD-quality stereo audio. At the same time, CSR provide Clear Voice Capture (CVC ®) technology for high-end Bluetooth stereo acoustic echo and noise cancellation. (More specific features of apt-X audio decoding technology, please see "Bluetooth 4.0 version of the CSR series chip key features of" and "CSR Bluetooth 4.0 and apt-X high-fidelity audio technology").

Perhaps, these figures may sound so professional that you are boring, ok, let look at evaluation to apt-x from manufacturers such as Nokia, Samsung.

Nokia's evaluation it that apt-x audio codec technology of CSR can break through the barriers of bandwidth, with CD-quality stereo audio through a Bluetooth connection to a wide variety of consumer electronics applications Transfer ".

Samsung's evaluation is similar, CSR apt-x technology demonstrates superior stereo audio Bluetooth connection quality, and its completed audio frequency bandwidth consistent complies with high-fidelity performance.

What are you waiting for still? Why do not you work together with us to enjoy this fantastic wireless HIFI music!

We also have another Bluetooth 4.0 Speaker except the above, this is portable Bluetooth 4.0 Bluetooth speaker with NFC and also support apx-t, the link is below:

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

Bluetooth4.0 NFC Stereo Speaker CSR4.0  Support APT-X

Bluetooth4.0 NFC Stereo Speaker CSR4.0  Support APT-X

Bluetooth4.0 NFC Stereo Speaker CSR4.0  Support APT-X

Influence Audio development of the two epoch-making technology - Bluetooth and MP3

Influence Audio development of the two epoch-making technology - Bluetooth and MP3 

We always like a stylish and fashion consumer electronic products like as iPhone or other smart phone, which have a lot of function such as playing music, playing game, reading, taking photos and other something except calling. But do you know it have two more favorite functions of playing music and Bluetooth configuration, which didn’t exist 20 years ago.

Let us guess: you’re probably reading this article on a laptop using high-speed internet. This article is probably competing for your attention against five other open tabs within your Google Chrome or IE browser. Metallica might be playing in the background, or even the Jackson 5.

But do you remember when all of that didn’t exist? Think back to a time when commercial music was still a luxury and concert tickets were purchased at a physical kiosk. Can’t do that? We must be getting old.

The fact is that the aforementioned technologies didn’t exist 20 years ago. We’re talking about a time before MP3s, iPhones, and Bluetooth. It was the dark days so prepare for a wild ride through tech history courtesy of your tour guides at Wistao Technology, the manufacturer of Bluetooth speakers and HIFI Bluetooth Acoustics. (more Bluetooth product information, please visit http://www.wistao.com/en/index).

1. Bluetooth - This beast of an invention, and arguably it’s favorite technology, was originally conceived in 1994 by Ericsson as an alternative to the old RS-232 data cables. Before long it was discovered that Bluetooth could connect many devices as a short range receiver that wouldn’t steal too much energy.The technology was soon introduced to numerous devices that allowed for hands-free calls, mass data sharing, and more. Now you can thank Bluetooth for many of your daily tasks including using your car for hands-free calling, wireless control of your cell phone, and yes listening to music on your Bluetooth speaker.

2. MP3 - We shudder when we remember jamming to Jewel on our old Walkmans. Jewel is still fantastic but the archaic technology with minimum storage capacity still haunts our nightmares. The MP3 file type was originally released to consumers in 1993 and only began to hit the internet in the latter half of 1994. With its introduction, consumers were able to easily compress songs meaning that more could fit onto a CD. This invention ultimately led the digital music revolution and became the forefather for how you consume music today.

Profile of WISTAO TECHNOLOGY

Profile of  WISTAO TECHNOLOGY

SHENZHEN WISTAOTECHNOLOGY Co., Ltd., was founded in 2008, which is specialized in the Researchand Development, Manufacturing, Sales of consumer electronics products like ascombination of Bluetooth Appliances and HIFI Acoustics Appliances, and ComputerPeripheral Accessories products. Our main product lines are: Portable BluetoothWireless Speaker Series ,HIFI Bluetooth Desktop Speaker Series, BluetoothVacuum Tube Speaker System, HIFI Bluetooth Earphone Series, Car-Kit BluetoothAppliance, Portable Speaker Series, Bluetooth Module Series, Bluetooth Solutionand Electronic Connectors, etc.

It is connected withsmart phone, tablet PC, and Laptop via Bluetooth that those Bluetooth productslike as mentioned above, and make users free from connecting cable and userscan move those appliances anywhere without the cable. The application for theabove products is compliance with Bluetooth 2.1 plus EDR specification or Bluetooth 3.0, 4.0 sepecification and compatible of Bluetooth version 1.1,1.2&2.0 specification0 at same time,and EDR technology that improve the data transmission speed via A2DP(AdvanceAudio Distribution Profile) technology at quality of 16 bits/44.1 KHZ(CD tone)to transfer the audio signal, make users enjoy the wonderful HIFI music; On theother hand, the products include an internal high sensitive microphone and echoerasing circuit (CVC) to support HFP(Hands-Free Profile, free-hand telephone),it lets users pick up a phone call free-hand once there’s incoming call duringenjoying the music. And, it prevents from radiation of mobile phone andaffecting hearing by Hands-Free function during pick-up a call.

Meanwhile, we alsoprovide a package solution service from Bluetooth audio solution to Bluetooth application,and the customized solution with all our heart.

Our company set upthose departments such as Marketing Development, R&D,SCM,QE and PE, etc. tosupport our business development

Our products are hotsale in the consumers’ market with high praise, and we have built a long termcooperation relationship with key retailers and agents. We have full range ofproducts like Consumer Electronics Appliance, Computer Peripheral Accessories,and Electronic Components in reasonable price.We win and maintain customers trust in quality, trust, technical support and best service.

Our vision:Convenient Life with Wireless.

Our mission: Providethe hearing enjoy and appliances to customers with short distance wireless& mobile HIFI music

Our Values: Trust atBusiness, Customers First, Result-oriental, and Team Work.
 
Contact Information:

SHENZHEN WISTAO TECHNOLOGY CO,.LTD
Address: Room 2105, Building No. 126, Guowei Industrial,Gouwei Road, Luohu District, Shenzhen City, Guangdong Province, PRC.
Contact Person: Mr. Vincent Zhang
Job Title: Business Development Manager
Telephone: (086) 755 86064703 -608
Email Address: vincentz@wisdao.com
Skype: wistaotech
MSN: vincentzh2001@hotmail.com
Website: http://www.wistao.com