Sansui - A-550 Solid state integrated amplifier

AI overview

The Sansui A-550 (part of the Classique 550 series or released as a standalone model around 1980) is a vintage integrated stereo amplifier. This model is built around a STK-4843 power module (hybrid IC).
There were two small factory variants released at the time (including the A-E550). Depending on the specific regional version, the following technical specifications apply:

General Specifications

• Output power: 30 to 45 watts per channel into 8Ω (stereo) (Some manuals for the A-E550 variant list 55 watts)
• Frequency response: 10Hz to 50kHz (or up to 60kHz depending on revision)
• Total harmonic distortion (THD): 0.07% to 0.08%
• Signal-to-noise ratio: 72dB (Phono MM), 90dB (Line)
• Minimum speaker impedance: 8Ω

Connections & Sensitivity

• Inputs: Phono (MM), Tuner, Tape 1 & 2, Aux and a microphone jack
• Input sensitivity: 2.5mV to 3.2mV (Phono), 150mV to 200mV (Line), 0.6mV (Mic)
• Line output (Rec Out): 130mV to 160mV

Physical Characteristics

• Dimensions (W x H x D): Approximately 430 x 111 x 298 mm (Depth variations may occur per front panel version)
• Weight: About 5.5 kg
The receiver is well packaged and shipped with tracking.