ขาย 6H9C El34 5U4G ชุดเครื่องขยายเสียง Diy เครื่องขยายเสียงในบ้าน 13W+13W ราคาที่ดีที่สุด

The power cord is provided by yourself (the power cord on the computer). Please prepare it by yourself because it is related to safety issues. It is not provided in the finished kit 220v EL-34-B single-ended Class A tube amplifier kit 13w+13w stainless steel brushed surface, EL-34-B tube amplifier with warm and mellow tone, simple and easy to make, all handmade Electron tube EL-34-B brand new bile duct. The output end has two ports of 4 ohms and 8 ohms. 6n9p stock unused +EL34-B brand new bladder rectifier tube 5z3p stock bladder unused Specially equipped with 2 brand new BENNIC (Bennick) 0.33UF630V capacitors, amplifier audio coupling boutique fever capacitors, 2 220uf/63v cathode capacitors ELNA is a well-known Japanese electrolytic capacitor manufacturer with more than 60 years of vicissitudes. The research and development of audio capacitors has a history of 25 years, and it can be said to be the leader of the Japanese capacitor industry. The tube power amplifier was once glorious in history, but with the gradual maturity of the transistor and integrated circuit technology, the tube power amplifier was left out. However, recently, due to the emergence of laser record players that require large dynamic amplifiers, tube amplifiers have once again been favored by audio enthusiasts, and they have become a prairie fire. Comparing the two power amplifiers with instrument test indicators, it can be found that the indicators of the transistor power amplifier are far better than the tube power amplifier, but this is obtained by deep negative feedback, which makes the transient response of the transistor power amplifier poor and greatly affects the sound quality. The actual sound quality evaluation shows that the sound quality of the tube power amplifier is better than the general transistor (or integrated circuit) power amplifier. In order to enable readers to appreciate the refreshing sound quality of the tube power amplifier, the author designed this pure class A tube power amplifier for everyone to comment on. The indicators are as follows: output power: 13w+13w (RMS); frequency response: 35Hz～18kHz (±3dB); total harmonic distortion: ≤1.5%; input peak voltage: 500mV. Component selection and production: The resistors selected by this machine use metal film resistors, all of which are 12W metal film resistors. The capacitors are imported small-volume color TV capacitors, and the others are capacitors with a withstand voltage of 450v or more. The electron tube uses J-level (** level) to make the machine have higher reliability. The output transformer is one of the keys to the sound quality of the power amplifier. The 180W power transformer used in this machine is made of imported high-quality silicon steel sheet, and the 13w output transformer is made of Japan Z11 0.35. The 22-core annealing sheet collar is wound with 4 clips and 3, and the inductance is about 20H. Use note: Many readers may not have used a tube amplifier, so it is necessary to say a few more words about its use. 1. The tube power amplifier has certain requirements for the load resistance. It is designed to be 48Ω and cannot be changed to other values at will. Otherwise, the load resistance of 6P3 will change and its working characteristics will be destroyed. 2. When the tube power amplifier is working, the load must not be disconnected, otherwise, the EL-34-B load resistance will become infinite, and the screen voltage will rise very high, which will cause the output transformer to breakdown. 3. If the reader uses the tube front stage to cooperate with this power amplifier, then when the sound is played, the front stage amplifier should be turned on first, and then the power amplifier. In order to prevent the power amplifier from being damaged by the impact current of the previous stage. 4. A tube amplifier is different from a transistor, so it should be preheated before it is put into use. 5. Be sure to pay attention to safety when debugging or dismantling the tube amplifier. Because its internal voltage is relatively high, unlike a transistor power amplifier, it generally works under low voltage. Later, a reference circuit of this machine amplifier is provided for readers' reference when making.