The Rotel RX-503 is an AM/FM stereo receiver introduced around 1976. Delivering 35 watts per channel into 8 ohms, it belongs to Rotel’s mid-70s golden era lineup known for warm, clear sound and classic silver-face aesthetics. 
 
Design and Technical Specs
Power Output: 35 watts per channel into 8Ω (stereo).
Frequency Response: 20Hz to 20kHz.
Total Harmonic Distortion: 0.5%.
Build: Heavy metal chassis weighing roughly 10 kg.
Inputs: Phono (MM), Tape, and Auxiliary inputs.