akai AM-U55 (1981–82)
A stereo integrated amplifier made in Japan, delivering 55 watts per channel into 8Ω
Overview
The Akai AM-U55 is a stereo integrated amplifier built in Japan from 1981 to 1982. It puts out 55 watts RMS per channel into 8 ohms in stereo mode, which makes it a mid-powered receiver for its era. It came in a silver finish and was sold as both "Akai AM-U55" and "AKAI AM-U55/J". The AM-U55/J runs on 120V, 60Hz and draws 20 watts. The exact input and output layout isn't fully documented. A listing reference to "Phono, Pre..." suggests at least phono and preamp-level inputs.
Design
The design has a front-end IF coil core, and the service documentation says it is adjustable. That points to internal signal filtering or tuning circuitry. The service manual also says "for improvement purposes, specifications and design are subject to change," a common disclaimer in Akai technical literature of the period.
Market
A recent listing at Audio Vintage Shop has the AM-U55 at $474.00 USD. Users report a few common problems: erratic DC offset voltage (up to 2 volts) on the right channel, intermittent power likely from loose fuseholders, and a dead left channel in stereo mode while the right channel keeps working. A service manual is available for the AM-U55/J variant.
eBay Listings
As an eBay Partner, we earn from qualifying purchases. This helps support our independent vintage technology research.
Related Models
- Akai AM-2400 (1978)
- Akai AM-2600 (1977)
- Akai AM-2650 (1975)
- Akai AM-2850 (1975)
- Akai AM-32 (1978)
- Eico 3150 (1967)
- Fisher CUSTOM-ELECTRA-I (K-14/K-15) (1957)
- Fisher CUSTOM-ELECTRA IV (E33/E44) (1960)
- Akai AM-73 (1973)
- Heathkit AA-32 (1960s)