Class push-pull tube power amplifier circuit diagram 2A3A

FIG. 2A3A is a low direct thermal resistance transistor with a resistance of only 800 ohms. The output transformer has a primary screen to load impedance of 3.5k ohms. The push-pull amplifier tube operates with a screen voltage ranging from 360 to 380V, while the cathode voltage to ground is between 60 to 80V. The total working current of the power amplifier is between 80 to 100mA, achieving a maximum output power of 15W. The machine exhibits a distortion factor of 1% to 2%, with a frequency response from 20Hz to 40kHz at ±2dB.

The circuit described includes a low direct thermal resistance transistor, identified as FIG. 2A3A, characterized by its minimal resistance of 800 ohms. This feature is particularly advantageous in high-efficiency applications, as it facilitates lower heat generation and improved thermal management. The output transformer is designed with a primary screen to load impedance of 3.5k ohms, which is essential for matching the impedance of the load to optimize power transfer and minimize signal loss.

In a push-pull amplifier configuration, the tube operates with a screen voltage between 360V and 380V. This high voltage is necessary to ensure that the output stage can drive the load effectively while maintaining linearity. The cathode voltage, which is referenced to ground, ranges from 60V to 80V, providing a suitable biasing condition for the tubes to operate efficiently.

The total working current of the power amplifier falls within the range of 80mA to 100mA, which is critical for determining the overall power output and efficiency of the amplifier circuit. The maximum output power is specified at 15W, indicating the capability of the amplifier to deliver substantial audio power for driving speakers or other loads.

The distortion factor of the amplifier is maintained between 1% and 2%, highlighting the circuit's ability to produce a clean and accurate audio signal. This low distortion is crucial for high-fidelity audio applications where signal integrity is paramount. Additionally, the frequency response of the amplifier spans from 20Hz to 40kHz with a variation of ±2dB, demonstrating its suitability for a wide range of audio frequencies, ensuring that both low and high frequencies are reproduced accurately without significant attenuation. This frequency response makes the amplifier ideal for various audio applications, including music playback and professional audio processing.FIG. 2A3A low direct thermal resistance transistor, its resistance is only 800, so the output transformer primary screen to screen to load impedance 3.5k Cong. Push-pull amplif ier tube screen voltage take 360 ~ 380V, cathode to ground voltage is 60 ~ 80V, total working current of the power amplifier 80 ~ 100mA, maximum output power up to 15W. The machine distortion factor of 1% to 2%, frequency response from 20Hz ~ 40kHz 2dB.