The ADCOM GFA-565 is a monaural power amplifier rated at <0.02% THD from 20Hz to 20kHz with 300 watts into 8 ohms, 450 watts into 4 ohms, and 850 watts into 2 ohms. The output stage is capable of greater than 60 amps into low-impedance loads. The amplifier employs a discrete dual-differential cascode Class-A front-end followed by a dual cascode Class-A voltage gain stage which amplify the input signal to the voltage required at the output of the amplifier. This high-voltage signal drives the high-current triple-Darlington-follower output stage which amplifies the current by a factor of about 50,000.