How to distinguish the power amplifier from the power amplifier tube

This paper will show you how to choose a good power amplifiers.

1. From the printed fonts: the authentic fonts are well-proportioned and the writing is not easy to be wiped off, and the fake fonts are like the ones written on it. The gentle rubbing with the fingernails will make the writing color lighter or even the paint. clear.

2. From the branding of the package press: English letters and numbers are printed on both sides of the solid screw hole near the upper part of the tube, and the words of different manufacturers or countries are printed in the middle of the lower part near the pin, such as SK (three Ken), PHILIPPINES (Philippines), MALAYSIA (Malaysia), etc. The fakes are not printed, or the prints on the above two points are ugly and ugly, and the following points are not printed because of the word position. Of course, some of the joint ventures have no prints here, but there are no obvious differences between them and the original tubes.

3. From the perspective of the packaging and processing technology of the power amplifier tube: the boundary between the heat sink and the package plastic of the genuine product is clear and the corner is flat, and the boundary of the bond of the fake product is unclear or even has a gap (the market is the most The easy-to-see fakes are the small Toshiba tubes A1491/C5198, D817/D1047), and the surface has a rough feel like brushed (this is the place where the fakes are most likely to be stuffed). Some models of imported tubes have been subjected to a matte finish on the surface of the fins (such as MATALOLA's MJL1302A/MJL3281A), while counterfeit and individual joint venture tubes do not have this process.

4. From the measurement results: when using the pointer multimeter R × 10k to block the positive and negative resistance between the c and e poles of the tube, the pointer of the genuine one is not moving or the angle of the swing is very small, and the fake The c and e pole forward resistance (NPN forward is Rce, PNP forward is Rec), the swing angle is much larger, that is, the resistance value is smaller (this indicates that the tube has a large penetration current); and the digital multimeter is used. When measuring the magnification of the tube β, the consistency of the genuine (especially the inlet tube) is very good, and the consistency of the fake is generally poor.

5. Performance when using fake machine: Since the pressure resistance of the pipe is generally low, it is easy to cause the pipe to burn when it is turned on; or the heat is more serious than the genuine one. At this time, the c and e pole resistance of the pipe is smaller than when it is not installed. Much more, and the deviation of β is even larger, and there is no such phenomenon in genuine products.

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The Gap between Electronic amplifier and analog amplifier

Because electronic amplifiers work entirely differently from conventional analog amplifiers, they conquer some of their inherent flaws of analog amplifiers and possess some exceptional capabilities. The next introduces the gap between electronic power amplifier and power amplifier that is analog.

The overload capacity of electronic power amplifier circuits is a lot greater compared to the analog power amplifiers. After the energy amplifier tube operates in the terminal area during regular operation, once the energy amplifier tube operates in the projection area, harmonic distortion happens and the level of stimulation increases exponentially. The audio quality is quickly deteriorating. The electronic power is obviously in the saturation zone and also the cut-off zone once the energy is amplified. Provided that the power amplifier tube isn't damaged, the distortion won't grow quickly.

Considering that the electronic power amplifier utilizes a switching amplifier , the performance is very high, as much as 75~90 (the analog power amplifier efficiency is just 30~50), and essentially doesn't create heat during operation. Because of this, it doesn't mimic the static current consumption of this energy amplifier. Each of the energy is all but earmarked for the sound output. After incorporating the analog amplification without damaging feedback, it's better"energy" attributes, and the transient response is great. Feeling is very powerful.

Difference two, crossover distortion and mismatch distortion
Analog Class B power amplifiers are set in zero-crossing distortion because of the nonlinearity of the transistor in low currents. The electronic amplifier just works in the shifting state and doesn't create crossover distortion.

The analog power amplifier includes a mismatched stimulation of the output waveform as a result of inconsistent push-pull attributes. Thus, when designing the push-pull amplifier , the prerequisites for the power amplifier tube are extremely rigorous. The digital power amplifier does not have any particular prerequisites for its pairing of this change tube, and essentially doesn't have to be strictly chosen to be utilized.

Since the internal resistance of the power amplifier tube at the optical power amplifier is big, once the speakers using distinct resistance values ​​are matched, the functioning condition of the analog power amplifier circuit is influenced by the magnitude of the load (speaker). The inner resistance of the electronic power amplifier doesn't exceed 0.2 Ω (the inner resistance of the change tubing and the inner resistance of this filter), along with the resistance value (4~8 Ω) relative to the load (speaker) is entirely negligible, so there's no fitting difficulty with the speaker system.

Analog power amplifiers use nearly all negative feedback loops to make sure that their electroacoustic parameters. The digital power amplifier doesn't utilize any analog amplification feedback circuit for electricity conversion, so preventing transient intermodulation distortion.

Difference 5, solid image localization
For analog power amplifiers, there's normally a phase difference between the output and the input signal, and also the stage distortion is different once the output is different. The digital power amplifier employs digital signal amplification to create the output and the input phase precisely the same, and the phase shift is zero, so the audio picture is positioned right.

Length 6, update
The electronic amplifier can attain high power simply by replacing the change amplification module. The high-power switch amplification module includes a minimal price and has wide prospects in the specialist area.

Analog power amplifiers have anti inflammatory problems at all levels of work, which isn't conducive to mass manufacturing. The electronic power amplification component is an electronic circuit, and normally functions normally with no debugging, and is very acceptable for mass production.

During the above mentioned introduction, I think that everybody has understood the gap between electronic power amplifier and analog power amplifier.

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What is the difference between a professional power amplifier and a home power amplifier?

A lot of amplifiers have seen the electrical schematics of professional amplifiers and home amplifiers. If you only look at the electrical schematic, it seems that there is no significant difference between professional amplifiers and home amplifiers. From the point of view of use, both are used to drive the sound of the speakers, which seems to be the same. From the performance indicators, the basic performance indicators of this household power amplifier and professional power amplifier are similar. How to distinguish between the two in life? Let me take you to see if there is a difference between the two.

First: The usage environment is different. The home power amplifier is generally used for home playback, and its characteristics are that the sound quality is delicate and soft, the appearance is more delicate and beautiful, the sound pressure level of the sound is not too high, and the power to be received is small. Professional amplifiers are generally used in professional entertainment venues such as dance halls, karaoke halls, Beijing theaters, auditoriums and sports venues. The general professional power amplifier has high sensitivity, good strength and high power consumption. Compared with the home power amplifier, its sound quality is hard and the appearance is not very delicate.

Second: The material configuration is different. Professional power amplifiers generally need to work in a high-power state for a long time, so professional power amplifiers require large power headroom, high reliability, small temperature rise at the output stage, and good circuit stability. In order to meet such requirements, amplifiers have special considerations in design, materials, etc. that are different from home amplifiers.

Third: From the point of view of function setting, professional power machines often work with preamplifiers such as mixers, so they are mostly pure post-stage amplifiers. The setting of professional amplifier amplifiers is very simple, often only the power switch and output level adjustment potentiometer (or step attenuator) on the panel. However, due to the actual needs of professional power amplifiers, it is often possible to work in a two-channel state, or to become a mono amplifier after "bridging", so the professional power amplifier is often provided with a "bridge" switch. There are many models of home amplifiers that are "combined" amplifiers with preamplifiers. These combined amplifiers have many functions, often with audio source selection, monotonic control, and multiple audio input interfaces.

The above is today's sharing with you the difference between professional power amplifiers and home power amplifiers. If you are searching for the professional power amplifier, you can try about ev 7300 amplifier