Wednesday, February 19, 2014

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

Friday, February 7, 2014

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)

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

Sunday, January 26, 2014

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

Tuesday, January 21, 2014

How To Use Bluetooth Speaker

Sometimes our customer questions us why my Bluetooth speaker didn't work after the Bluetooth speaker is received from Online store of aliexpress. We summarize some tips to solve those and so on as below.

Firstly, it should be charged 3~4 hours when you received Bluetooth speaker because volume of battery is reduced during shipment and charging will active the battery to good condition that is a good suggestion.After charging completed, the led will be blue from red.

Secondly you will open your smartphone and go to setup menu to find Bluetooth function,at the same time you power on the Bluetooth speaker, put paring button as well click " searching Bluetooth devices" of your phone, then you will will find the name of your Bluetooth Speaker and click to complete paring, you will see the color of Bluetooth icon changed.At the moment, the paring process finished.

Finally, open your music player of your phone, enjoy Bluetooth music!

Here, we recommend two Bluetooth speaker which come from WISTAO, they are high quality and cost effective, they adopt CSR chips with Bluetooth 2.1 plus EDR.
The link is http://www.aliexpress.com/store/product/Free-Shipping-Portable-Wireless-Bluetooth-Speaker-Bluetooth-2-1-plus-EDR-Steoro-Supper-Bass-CSR-BC5/725205_759554755.html.