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2A3A tube push-pull power amplifier circuit

2015-01-05 06:46  
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2A3A tube push-pull power amplifier circuit
2A3 is a low ESR and direct-thermal transistor, and the internal resistance is only 800Ω, so the output transformer primary screen load impedance needs 3.5kΩ. Push-pull power amplifier tube's screen voltage takes 360 ​​~ 380V, cathode-to-ground voltage is 60 ~ 80V, and the total operating current of amplifier is 80 ~ 100mA, the maximum output power is up to 15W. Local distortion factor is 1% to 2%, and frequency response is ± 2dB in the range of 20Hz ~ 40kHz.