AM/FM Stereo Tuner: Equipped with an AM/FM tuner section for receiving radio broadcasts. 1 Expect features like a tuning dial, signal strength meter, and possibly AFC (Automatic Frequency Control) to help lock onto FM stations.
Stereo Amplifier: An integrated stereo amplifier to power loudspeakers. The power output is unknown without specific documentation, but Yamaha receivers of this era often offered a respectable amount of power for typical home listening.
Multiple Inputs: Likely to include inputs for various audio sources such as:
Phono: For connecting a turntable (likely for Moving Magnet cartridges).
Aux/Line: For connecting CD players, tape decks, or other line-level sources.
Tape Monitor Loops: For connecting tape recorders and allowing for monitoring recordings.
Tone Controls: Bass and treble controls would likely be present to allow for some adjustment of the tonal balance.
Loudness Control: A loudness switch to boost bass and treble at lower listening levels, compensating for the ear's reduced sensitivity to these frequencies.
Headphone Output: A standard headphone jack for private listening.
Speaker Outputs: Terminals for connecting one or more pairs of stereo speakers.
Solid Build Quality: Yamaha products from this era were generally well-built and reliable.
Vintage Aesthetics: Expect a classic silver faceplate design with clear labeling and a functional layout, typical of receivers from that period. Some models might have included a wooden cabinet or accents.
Potential Specifications (Estimates based on similar Yamaha receivers): Since precise specifications for the CS-70R are difficult to find, these are estimations:
Power Output: Likely in the range of 20-50 Watts per channel into 8 ohms.
Frequency Response: 20 Hz to 20 kHz ± 1 dB.
Total Harmonic Distortion (THD): Likely less than 0.1%.
Input Sensitivity: Phono (MM) around 2-3 mV, Line around 150 mV.
Signal to Noise Ratio: Phono around 75-80 dB, Line around 90 dB.
