Homemade Bilblashi Hybrid Hi-Fi Amplifier ----- HIFI AMPLIFIER

The electronic tube megaphone attracts a generation of audio enthusiasts with its warm soft, full of sweet tones. However, it also has a fatal weakness: high output impedance, it is necessary to use the output transformer to match the ordinary speaker, but a quality output transformer is very expensive, often makes the majority of "enthusiasts" to stop. This may be one of the reasons why the electronic pipe power amplifier is not as high as the transistor. However, if the transistor will appear in the end-level output in the input stage, let us try it. Figure 1 is a chimetric mixed amplifier designed by the author recently adopted domestic bile duct 6n11. For the majority of "gallbladder" machine, the enthusiasts may play the role of the jade. Figure 2 is a power supply circuit. Be Figure 2 Power supply circuit In the principle of a simple, the input stage portion is 6N11 to form a parallel tuning push-pull zoom in this circuit form (ie SRPP form), which is the high frequency input stage in the TV field, and later used in the audio field. The distortion, dynamic range, etc. of the circuit is superior to the triode A amplifying circuit. In particular, the signal to 7 kHz or more is superior to the triode amplification, which makes up for the high-frequency response of the amphipid. The power amplifier is used to consist of a pair of high power pairs of tube. The tube model is: MJ11032 and MJ11033, which is the tube produced by Motorola, USA. Its BVECO is 120 V. Maximum output current 50 a, dissipation power 300 W, and the feature frequency is 30 MHz. Component selection: 6N11 Select Beijing Shuguang factory products, can be exchanged directly with 6DJ8, 6922, of course, can also be toned, and the price is only 6N1 half of 6N3, but this speed is much slow. R3, R4 resistance error is controlled within 99.9%. The method is to see if it is half of VB2 by measuring the voltage value of the A point. The coupling capacitor C1 preferably uses a MKP capacitor having a withstand voltage greater than 450 V, or the CBB activation capacitance in a WiMA capacitor or a washing machine. The resistor is except that the remainder is selected from 1/4 W metal resistance. MJ11032 and MJ11033 should use American original products, while the printed tube with "Mexico" in the market is poor. If the filament is used to use AC power, the hearing is more alcohol, but the communication is not treated. At this time, the method can be grounded at one end of the filament. Due to the simple power discharge circuit, in order to be completed as soon as possible, the author uses a shed welding, and the result does not appear this noise. When static, you can't listen to any noise from the speaker 15. The overall impression that gave people after listening is that the sound is full, causing people to hear, when using ordinary CD machine, there is no "digital" sound, and the sound is natural and smooth.