Shuguang new gallbladder 2A3C single-ended aspirator ----- 2A3C Power Amplifer

Dawn of a new bile 2A3C single-ended tube amp, 2A3C power amplifer Keywords: dawn of a new single-ended tube amp bile 2A3C Dawn of a new single-ended tube amp bile 2A3C Dawn of the new plant is modified bile 2A3C of 2A3. The main feature is the use of some features large single screen 300B, the sound is also improved over conventional 2A3. Found By comparison, the data for 2A3C: 320V pressure screen (including self-biased when the voltage drop on RK), screen flow 45 ~ 65mA, screen consumption of about 20W, the gate negative 45-55V, maximum output 7W, effective output 5W. When the docking between the screen is 275V, the AC load impedance is 2.75 kΩ. Tube current level pushed large output current, the gate-drain resistance of less than 300kΩ. Mounting selected "simple first" two-stage amplification. Enter a 6J4P amplification responsible for one channel and push. 6J4P actual pressure screen (Ra lower) take 130V, screen flow 5.5mA, to obtain not less than 0.15W of power driven. Note that this circuit is "underdamped" design, effective amplitude 26V AC, much smaller than the standard 2A3C given input value, so that the former requires a certain level to be power driven. If the high μ small tube current, the AC amplitude is necessary to increase as much as possible to improve the screen or pressure to ensure good load characteristics. Consider pentode distortion and noise, the first amplification stage to be carefully selected Ra and RK. When the voltage drop on the guarantee RK is about 1.5V, RK is possible a smaller value. Ra value can not be too large, otherwise the high-frequency variation, the sound quality is also affected. The power supply uses the traditional "gallball + π type" filtering. Choke front of the capacitance and "color" tone is very relevant. 6J4P two channels of decoupling capacitors greatest impact on the sound of the machine, are the two key points of the whole machine school sound. High-quality oil electrolytic capacitor is a good balanced approach.

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