The amplifier is different from the transistor (the same is true). Strictly speaking, the sounds of different bile ducts are also different. The difference in circuit design, the tone also has different changes, in which the form of push-pull amplifier circuit is in the quantity, occupying the mainstream position of the market. Its biggest feature is that compared with the single-ended amplifier circuit, the higher efficiency and higher output power are also compared. Big. Of course, the power utilization rate is also higher. For example, our common KT88, KT100, 6550, EL34, 6L6, etc., are applied in the output stage of the push-pull amplifier circuit. The push-pull amplifier circuit amplifies the positive and negative half cycles of the signal by the push-pull tube, and in the primary loop of the output transformer, it has a certain inhibitory effect on noise, hum, and other noise signals formed in the circuit, because there is no phase inversion. The signal, in the push-pull amplifier circuit, cannot be coupled to the output cow output terminal. Therefore, the signal-to-noise ratio of the circuit is relatively good. At the same time, since the push-pull output transformer does not have DC magnetization, the output transformer can be fabricated in the same way as the power transformer by cross-stacking silicon steel sheets, so that the volume of the output cow can be reduced relative to single-ended amplification, so that the cost is reduced due to These significant advantages, so the amplifier manufacturers are more willing to adopt.
In the push-pull amplifier circuit, since at least two output tubes are used to amplify the positive and negative half cycles of the signal, it is necessary to design an inverter circuit in the circuit to distribute the appropriate signal to the power output tube, so as to satisfy the push-pull amplification. The basic working conditions of the circuit. In the inverter circuit of the amplifier, there is a reverse phase of the transformer, and the bile tube is also used for phase inversion. For example, we often see the screen split phase inversion, and the long tail inverter circuit, etc., but no matter which kind of method can be used to reverse the phase, there are certain advantages and disadvantages. The use of transformers for inverter circuit design is costly. And can not use large negative feedback to improve the sound quality, very few people use. The electron tube inverter circuit is difficult to ensure the consistency of the signal from low frequency to high frequency positive and negative half cycle division. These shortcomings of the inverter circuit make the playback of the sound quality an obstacle in this link.
The single-ended amplified power output circuit is lower in efficiency than the push-pull amplifier circuit, making the circuit much simpler than the push-pull circuit, using fewer components, and the failure rate is much lower than that of the push-pull amplifier circuit. Since the single-ended amplifier circuit does not have an inverter circuit, the signal goes directly to the input stage of the final stage power amplifier tube, so there is no trouble with the inverter circuit. In the push-pull amplifier circuit, the positive and negative half-cycle signals after the phase-inversion are sent to the “up and down†push-pull tube for push-pull amplification at the gate level. Since at least two power tubes are used to coordinate the work, this requires each The consistent performance of the power amplifier amplifier is better, so as to ensure that the waveform after the push-pull amplification is intact and not distortion, but in fact, the performance of each pair of push-pull tubes is difficult to ensure the consistency from low frequency to high frequency. The so-called pairing is just a match in a certain frequency range. If the push-pull amplifier circuit is operated in the class B state, there is a risk of crossover distortion. In the single-ended amplifier circuit, because the positive and negative complete waveforms of the signal are amplified in a power amplifier, and since the single-tube amplifier circuit mostly works in the class A state, the working point of the class A amplifier circuit is It is the middle part of the straight part of the curve, so there is no problem such as crossover distortion. Another contrast is that the reason why the amplifier is better than the transistor (relatively speaking), one of the most important reasons is that although the indicators of the transistor machine are relatively high, the third harmonic distortion is larger than the amplifier, that is, the odd harmonics are compared. Large, and the second harmonic distortion of the amplifier is larger than that of the transistor machine, that is, the even harmonic vibration distortion is larger than that of the transistor machine, but from the sense of hearing, the human ear is sensitive to odd harmonic distortion, which brings people The impression is a blunt feeling that is more annoying, but coupled harmonic distortion gives a soft feeling. The human ear is more acceptable, just like the right amount of condiments, which is also a major factor in the good sound of the amplifier.
For the push-pull amplification amplifier circuit and the single-ended amplification amplifier circuit, the odd-order harmonic distortion of the single-ended amplification output circuit is lower than that of the push-pull amplification circuit, and most of them exist as coupling subharmonics. Wave distortion, so better sound.
Although the single-ended amplifier circuit is simple and easy to manufacture, it has strict requirements on the arrangement of components between circuits, and the design is unreasonable, and it is easy to generate hum. The single-ended output transformer is more complicated to manufacture than the push-pull output transformer. This is because the output transformer of the single-ended amplifier circuit has a DC high voltage through it, which will cause magnetic saturation. DC high voltage passes, but this phenomenon can be offset. Therefore, when the silicon steel sheet is put into operation, a certain gap and air gap are required. The size of the air gap is adjusted according to the circuit requirements and the output power. Because silicon steel has the existence of air gap, the permeability of the whole output cow is greatly reduced, so it is necessary to use silicon steel sheet with large cross-sectional area to make the cost. The cost is more difficult than the push-pull output cow at the same output power. some.
Single-ended output amplifier circuit, because of the simplicity of the circuit, sound quality and low failure rate, it is very popular and pursued by experienced enthusiasts. Don't forget that there are many bile ducts in the world that are famous for their fascinating sounds in the design of single-tube output circuits. For example, the WE300B, the daring king 845, which is known as the "Prince of the White Horse", and the noble sound quality they reproduce can only exert their maximum potential when they are single-ended.
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