IWISTAO Tube Preamplifier with Matisse Fantasy Line Stage GE 5670W for Your Upgrading Car Audio

It is a Tube Preamplifier with Matisse Fantasy Line Stage GE 5670W, and its power supply is DC 12V, you may use it to update your car audio system from the DC12V.

The main feature of Matisse Fantasy Line Stage is sweet mellow sounds, calm and powerful low-frequency sound field is very open, like a sense of the scene, and here it goes without saying! Since tube preamp birth, it is well known as its design concept for distinguished from commonplace, pure and transparent sound quality to really spotless, and become a world-class reference.

The circuits adopt British famous circuit of Matisse Fantasy Line Stage, and with 12VDC power supply (Recommanded Power supply: DC12V / 1A ). The HIFI Tube Pre-Amplifier is made of HIFI imported components like as United States AB resistance, which can bring a sense of warm and soft vocals, Philips filter capacitor charging and discharging more reliable, Germany ERO coupling capacitor to that make the sound more balance, ALPS potentiometer sound good but also durable, gold-plated contacts Cinch make the connection more reliable and greatly reduce transmission of resistance signals.

Also there is vedio to paly music and it is taken by iPhone 5S.

More details, please find http://www.aliexpress.com/store/product/Free-Shipping-DC12V-HIFI-Tube-Pre-Amplifier-with-Matisse-Fantasy-Line-Stage-5670W-Tubes-HIFI-Component/725205_1610495358.html

What is an Operational Amplifier?---OpAmps Tutorial Vedio

What is an Operational Amplifier?---OpAmps Tutorial Vedio

Operationl Amplifier, especially OP IC had been used in Power Amplifer as preamplifier or other functions. 

There is a excellent OP IC with metal seal, this is LME49720,which is ultra-low distortion rate; it is a professional audio op amp that is able to achieve total harmonic distortion and noise performance under 0.00003% or less in the world's only, and pursued and loved by many audiophiles around the world.

LME49720HA is one of the most top HIFI op amps IC in the world, low noise, high slew rate, wide operating voltage range and output current, etc., high overall performance is unprecedented, and can easily meet the most demanding audio application requirements. Ideal for professional and high-end audio system, it can be widely used in high fidelity buffer amplifier, high-fidelity active filters, high-fidelity headphone amplifier, high-fidelity phono equalizer amplifier, high-quality audio amplifier, high-fidelity preamplifier, high-fidelity multimedia, high-performance professional audio, high-fidelity balanced network, high-performance line drives, high-performance line receiver, mixer, etc. with the division.

LME49720HA is National Semiconductor's new generation of "op-amp of the Emperor", LM4562HA upgrade, sounds beautiful noble, comprehensive and balanced, clean sound at the end, natural, high analytical, dynamic large, low dive deep, IF full, people sound sweet and moist, high frequency transparent, delicate soft, contagious.

Specifications

Operating voltage: ± 2.5V ~ ± 17.0V

Harmonic distortion: 0.00003%

Noise Density: 2.7nV / √ ^ Hz

Conversion Rate: 20V / μs

But,do you know know-how of Operatial Amplifier. If you want to know more, please find the vedio below.




Also, there is a Closs A Headphone Amplifier and it is a preamplifier with OP IC LME49720HA, its sound is great.

http://www.aliexpress.com/store/product/Headphone-Amplifier-Discrete-Component-Pure-HIFI-Class-A-Amp-Lehmann-Upgraded-Version-Plastic-sealing-LM47910/725205_1931445868.html

Metal seal LM47910

Headphone Amplifier with OP LM47910 

Tube Hybrid Radio 6N2 Preamplifier AM/FM

Tube Hybrid Radio High Sensitivity 6N2 Preamplifier 12W Output Power AM /FM 4 Inch Speaker Desktop Wooden Cabinet

Its high-frequency is clarity and bright, structured, human voice restoring is true; powerful low-frequency thick, full of rich; treble is not exaggerated. Overall sound quality is balance and excellent. Clear radio effects, and unmatched by other products, it is a decorative and practical product.


It is high Sensitivity with 6N2 Preamplifier, and up to 12W Output Power, built-in 4 Inch Speaker Wooden Cabinet, suitable for placing on deskt.

More details, please find

http://www.aliexpress.com/store/product/Tube-Hybrid-Radio-High-Sensitivity-6N2-Preamplifier-12W-Output-Power-AM-FM-4-Inch-Speaker-Desktop/725205_32289104252.html

Learn more about phono stage amplifier

Learn more about phono stage amplifier

Phono amplifier is designed for a phono signal amplification while using Turntables amplifier inside for special sound equalization circuit (RIAA) for restoring vinyl, it cannot be used for other purposes.

Method for checking noise sources

After phono player connected with the phono amplifier stage, if there is a significant low-frequency noise, you need to check in which part of the noise. First unplug the phono amplifier input signal cable to disconnect connection between them, if the low-frequency noise disappeared or significantly reduced, that may explain the noise from the phono player; obvious if the same or reduce low frequency noise , the noise it is very likely to put itself caused by phono amplifier.

It may cause a greater frequency noise that no specialized non-standard phono ground wire.

Generally, nonstandard phonograph is a turntable part of music center to cope with this set of sound designed, when external phono amplifier put to ground that could cause a large hum due to the different ground ways

There is more Phono stage amplifier, and some PCBA Kit. More details, please find the links

Phono stage amplifier

http://www.aliexpress.com/store/group/HIFI-MM-MC-Phono-Amplifier/725205_256242016.html

Phono stage amplifier PCBA Kit

http://www.aliexpress.com/store/group/Amplifier-PCBA-Board-Finished/725205_256211124.html

Why do more audiophiles like class A tube amplifier?

Why do more audiophiles like 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, someaudiophiles 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.

More Tube Amplifier, please find WISTAO online store at aliexpress

http://www.aliexpress.com/store/group/HIFI-Tube-Amplifier/725205_250077087.html