The Revox A 78 MK II is an integrated amplifier manufactured by Revox from 1974 to 1978. It features a sturdy and compact design with dimensions of 415 mm in width, 160 mm in height, and 245 mm in depth, weighing 8.2 kg. The amplifier is equipped with multiple input connections including options for microphone, magnetic or dynamic pickups, crystal pickups, tape play, and auxiliary inputs. It supports speaker outputs for 4 to 16 Ohm speakers, accommodating two pairs of speakers with a minimum impedance of 8 Ohms for simultaneous operation. With a continuous power output of 80 Watts at 8 Ohms and 100 Watts at 4 Ohms, the A 78 MK II can deliver dynamic power of up to 140 Watts at 8 Ohms and 160 Watts at 4 Ohms. Other technical specifications include a frequency response of 20 Hz to 20 kHz, intermodulation distortion of less than 0.3%, and a damping factor greater than 20. Tone control is provided in 4 dB steps with ±12 dB adjustments at 60 Hz and 12,000 Hz. It includes a presence filter and adheres to the RIAA/IEC standard for phono equalization. The amplifier is available in a sleek silver and grey finish and is noted for its robust construction and effective performance.
