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.