At the beginning of 2017, I got a damaged McJingtu MC50 mono amplifier. After repairing and playing with it repeatedly, many components and parameters were modified, and the current machine was made. After all, MC50 is a relatively early product. At that time, due to the limitation of the production process and quality level of the components, the machine appeared to be relatively rudimentary. Although the appearance and workmanship were relatively rudimentary, the sound of this machine was not simple. These early machines continued the original tube. The tuning direction of the circuit, the sound coming out is still relatively mellow and warm.
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Mai Jingtu, which is unique in audio products, uses an exclusive output transformer, whether it is a tube amplifier or a transistor power amplifier. There are many advantages to using the output cow, mainly to ensure that the transistor can work when working under different frequency music signals. In a more reasonable linear region, the frequency characteristics and phase distortion of the output signal are lower, which is an important part of ensuring the sense of hearing. But at the same time, it is more difficult to make such output cattle, which is why no one has touched it in the DIY circle for many years. We selected the current partner after comparing several different samples, and there is basically no difference in sound comparison with the output of the original machine. At present, the power output tube of the whole machine uses a K134 field effect tube, the sound is clear and refined, it is not tiresome to listen to it for a long time, and it is more flavorful. This tube is only second-hand in the market, and there are not many second-hand ones. It is more appropriate to change and listen to it.
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Working conditions and functional configuration of the whole machine:
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1. Power supply voltage: 220V(110V version can be customized)
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2. The main voltage is 45V, and the transformer power is 150W
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3. 4 filter capacitors 100V10000UFX
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4. Weight of the whole machine: 12.2KG(Courier fee is charged at 13 kg with packaging)
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5. Power: 10.5WX2@8 ohms
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6. THD: 0.005%
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7. Frequency response: 20-22000Hz
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8, Size: 320X120X310
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Special note: This machine is pure armor, and its own heat loss is high. After a long time in summer, the temperature around the radiator can reach about 50 degrees, which is normal!
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