Akai R-44 (1974–1978)

The Akai R-44 is an integrated amplifier from the mid-1970s, built to the high standard of Japanese components of that era. Production years are given as either 1974-78 or 1975-77 depending on the source. The original price was $399.95 in the US or 395 DM in Germany. Some markets sold it as a "control amplifier," which fits the minimalist front panel - no tone controls, no filters, no loudness switch.

The amplifier is rated at 80 watts per channel into 8 ohms with both channels driven, with harmonic distortion stated at 0.05%. The circuit uses a three-stage differential amplifier with direct-coupled OCL output and a relay protection circuit. An FET input stage handles the MC phono option, and the unit accepts moving magnet and moving coil cartridges (50k and 100 ohms respectively). Inputs are phono 1 and 2, tuner, aux, and two tape loops. Outputs are speakers, two tape record outs, and a 6.3mm headphone jack. A 7-pin DIN socket is provided for one tape connection.

These specifications are consolidated from surviving documentation. Minor conflicts exist between sources and are noted.

Power output: 80 W/ch (8 ohms, both channels driven)
Harmonic distortion: 0.05%
Frequency response: 5–80,000 Hz (linear); 20–20,000 Hz (with loudness contour)
Speaker impedance: 4–16 ohms
Damping factor: 40
Outputs: Speakers (4–16 ohms), Tape 1 (150 mV/50k), Tape 2 (150 mV/50k), Headphones (6.3mm jack, 8 ohms)
Dimensions (W × H × D): 425 × 143 × 283 mm or 425 × 145 × 305 mm (sources disagree)
Weight: 11.5 kg or 13.5 kg (sources disagree)
Circuit: Three-stage differential amplifier, OCL, relay protection; FET input in MC stage
Tone controls: None; no filter, no loudness