18W gallbladder output AMPLIFIER output ----- 18W Vacuum Tube amplifier

18W gallbladder output AML, 18W Vacuum Tube Amplifier Keywords: 18W gallstick output, bile, courage, power amplifier, power amplifier, HIFI This is a rural power amplifier of 18W, and the final stage is connected to the negative feedback circuit (the bypass capacitance of the output stage self-bias resistor is canceled), and the electrical performance is superior. The circuit is shown. The input stage is a double tripode 6N3, and the end level is 6P1 and the IRF450 is used together. There is only three tubes, 6N3 and 6p1 are peanut tube, and the market discharge machine is also very low. 6N3 magnification μ = 35, mutual exchange GM = 5.9mA / V, common yin amplification, 6p1 output about 4W, IRF450 output 14W, and output 18W together. IRF450 can be replaced with other field effect power tubes, but its reverse withstand voltage must be greater than 500V, and power consumption is greater than 100W. When the IRF450 operating current is 113mA, the gate source pressure drops 3.5V, so the R5 is 68Ω (note that different field tube data is different, should be measured). If the R6 value is changed, the output power of the unit can be changed. However, if the IRF450 operating current is too large, it is easy to cause self-excitement. Output transformer needs to be homemade, its iron-cross-section S = 10cm2, the first time the number of turns is 14: 1, the impedance ratio is 1560Ω: 8Ω, the primary enameled line ∮ = 0.29mm, around 2100, secondary line = 1.00mm, Wrap around 150, there is no need to reside, you can achieve good results. Note, don't cross the iron chip, the iron clip or iron plate of the fixed core cannot be used, and the aluminum plate is used to do. The three cylinders of the iron core are placed on a layer of kraft paper to make a gap layer, ensuring that the core does not have a little magnetic saturation, so that the transformer distortion can minimize, the inductance L core S = 9cm2, the enamel line ∮ = 0.33mm, the wrap is full, The IRF450 is to use a larger radiator to dissipate heat. There is no big loop of this unit, and the transient response is good, the circuit is simple. It should be noted that 6P1 operating current should be 50 mA. It is necessary to adjust the resistance of R6 to set the power at the end of the final.

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