Audio amplifiers are at the very heart of every home theater system. As the quality and output power requirements of today’s loudspeakers increase, so do the demands of audio amps. It is difficult to pick an amplifier due to the multitude of models and designs. I will explain some of the most common amplifier designs such as “tube amps”, “linear amps”, “class-AB” and “class-D” in addition to “class-T amps” to help you understand some of the terms commonly used by amplifier manufacturers. This informative guide must also help you discover which topology is ideal for your particular application.
Simply put, the goal of Cayin Tube Amp would be to convert a small-power audio signal into a high-power audio signal. The top-power signal is big enough to operate a speaker sufficiently loud. In order to do that, an amp uses several elements which are controlled by the low-power signal to generate a big-power signal. These components range between tubes, bipolar transistors to FET transistors.
Tube amplifiers used to be common a few decades ago. A tube is able to control the existing flow according to a control voltage that is linked to the tube. Unfortunately, tube amplifiers have a fairly high amount of distortion. Technically speaking, tube amplifiers will introduce higher harmonics to the signal. However, this sign of tube amps still makes these popular. Many people describe tube amps as using a warm sound versus the cold sound of solid state amps.
Another drawback of tube amps, though, is definitely the low power efficiency. The vast majority of power which tube amps consume has been dissipated as heat and merely a fraction has been changed into audio power. Also, tubes are usually costly to make. Thus tube amps have mostly been replaced by solid-state amps which I will appear at next.
Solid state amps replace the tube with semiconductor elements, typically bipolar transistors or FETs. The earliest kind of solid-state amps is referred to as class-A amps. In class-A amps a transistor controls the existing flow according to a small-level signal. Some amps make use of a feedback mechanism in order to minimize the harmonic distortion. Class-A amps have the lowest distortion and in most cases also the lowest quantity of noise of the amplifier architecture. Should you need ultra-low distortion then you definitely should take a close look at class-A models. The main drawback is the fact that similar to tube amps class A amps have really low efficiency. As a result these amps require large heat sinks to dissipate the wasted energy and are usually fairly bulky.
Class-AB amps improve on the efficiency of HIFI RCA Cable. They utilize several transistors to interrupt the large-level signals into two separate areas, each of which is often amplified better. Therefore, class-AB amps are often small compared to class-A amps. However, this topology adds some non-linearity or distortion in the area where the signal switches between those areas. As such class-AB amps routinely have higher distortion than class-A amps.
Class-D amps improve on the efficiency of class-AB amps even further using a switching transistor which is constantly being switched on or off. Thereby this switching stage hardly dissipates any power and phczif the ability efficiency of class-D amps usually exceeds 90%. The switching transistor will be controlled by a pulse-width modulator. The switched large-level signal must be lowpass filtered in order to remove the switching signal and recover the audio signal. Because of non-linearities in the pulse-width modulator and the switching transistor itself, class-D amps by nature have between the highest audio distortion for any audio amplifier.
To solve the problem of high audio distortion, newer Line Magnetic incorporate feedback. The amplified signal is in comparison with the first low-level signal and errors are corrected. A well-known architecture which uses this type of feedback is called “class-T”. Class-T amps or “t amps” achieve audio distortion which compares with the audio distortion of class-A amps while at the same.