One, the gall blower is a machine made of tubes, tubes, also known as vacuum tubes, power consumption, power is not big, heat, and power on after a long warm-up process, some machines even need to warm up for more than two minutes to achieve better results, and the differences in the production process of tubes also lead to some other problems, such as slow leakage and other issues, in addition to the work of such a machine requires a high voltage, and some of the The machine and even the base plate will be charged.
Second, the stone machine generally refers to the semiconductor device to do the machine, the semiconductor can be a transistor, can also be an amplifier integrated circuits. This kind of machine is generally smaller in size and weight, and does not need to be turned on to warm up, powered on for a second or two can be used immediately, and generally do not have a high voltage. However, if the machine with transistors, the pairing is important, otherwise it is easy to produce the problem of imbalance of each channel.
Three, the difference
1, power reserves and overload resistance is different
Stone amplifier needs to have a lot of power reserves in order to avoid overload distortion, and once the overload distortion will rise sharply, and serious damage to the transistor, the sound naturally to become bad. But the overload resistance of the chassis amplifier is relatively strong, even if the overload occurs the peak of the music signal is only a little more than the normal waveform slip, in the sound will not hear much difference.
2, transient response is different
The open-loop indicator of the chassis amplifier is better than the transistor amplifier, it does not need to add the depth of negative feedback, and do not need to add the phase compensation capacitor can work stably. And stone machine amplifier open loop gain is generally very large, its excellent electro-acoustic indicators are relying on the addition of a large negative feedback to achieve, so in order to inhibit parasitic vibration is often used in a hysteresis compensation method, which will bring significant transient aberrations affecting the quality of sound.
3, different damping coefficients
Stone amplifier output internal resistance is generally much smaller than the tube amplifier, the damping coefficient can reach more than 100-200, while the maximum gall blower amplifier, but also for the 10-20, the speaker with the use of amplifiers with the requirement of damping coefficients to achieve a reasonable match in order to send out a good effect.
Expanded
The HIFI amplifier with the front gallbladder and rear stone design is better than the simple "gallbladder" or "stone" effect.
Expounding the concept of "before the gall bladder after the stone", from the amplifier amplification principle to start, in the design of power amplifiers, the designer will be divided into its internal pre-amplification and post-amplification, the so-called preamplification, its main role is to the signal source transmitted over the program signal for the necessary processing and voltage amplification, and then output to the rear stage amplifier.
It is like a railroad switch, control switching which one way audio signal access amplifier, which one way audio signal and amplifier disconnect; while the rear amplification is pure power amplification part, its role is to amplify the signal from the front stage as far as possible originally, our requirements for the rear stage, amplification multiplier as high as possible, and amplified signal distortion degree should be as low as possible.
In addition to the amplifier circuit, the post amplifier is also designed with a variety of protection circuits, such as short-circuit protection, over-voltage protection, overheating protection, over-current protection.
Baidu Encyclopedia - Stone Machine
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