Yamaha CR-400 Receiver (1973 - 1977)

Continuous power (at distortion):

8 Ohm: 2x 20 Watt

4 Ohm: 2x 24 Watt

Dynamic power:

8 Ohm: 2x 56 Watt

4 Ohm: 2x 76 Watt

Total harmonic distortion: < 0.1%

Damping factor: >40

Input (sensitivity/impedance)

Phono 3 mV/50 kOhm

Tape, Aux 150 mV/100 kOhm

Microphone 3 mV/50 KOhm

Output (level/impedance):

Rec-Out 150mV/10 KOhm

Pre-Out 200mV/3 KOhm

Frequency response: 20-50,000 Hz

Tone control:

Bass: ±10dB at 50 Hz

Treble: ±10dB at 10,000 Hz

Loudness: switchable

Subsonic: fixed 20Hz, 12dB/octave

Mute: No

Direct/Line-Straight: No

Ripple distance (short-circuited): >85dB

Stereo channel separation: >50dB

FM: 88-108 MHz

MW: 525 - 1605 kHz

Frequency response: 15 - 30,000 Hz

Input sensitivity: 2.5µV IHF

Distortion factor: 0.8% (stereo)

Signal to noise ratio: 68dB

Channel separation: 40dB

Selectivity: 65dB

Co-wave selection: 2dB

Spurious wave selection: 75dB

Image frequency attenuation: 55dB

IF attenuation: 75dB

AM suppression: 50dB

RDS: No

Station memory: No

Special Features:

Station center display

Transmitter field strength indicator

Adjustable microphone input

"A stereo receiver that emphasizes high sensitivity and cost performance.

The main amplifier section uses a pure complimentary service OCL circuit directly connected to all stages, and the first stage differential amplifier uses an FET as a constant current source to provide sufficient negative feedback for high stability.

The circuit of the main amplifier also serves as an active subsonic filter, and signals below 20 Hz (3 dB down point) are cut at a slope of 12dB/oct.

The equalizer amplifier uses a 3-stage direct-coupled monolithic IC to achieve high stability, low distortion factor and high gain, while the equalizer element uses high-quality parts to improve its characteristics.

The tone オ K-to-roll circuit adopts Yamaha's original NF type, which applies negative feedback between the collector and emitter of a 2-stage direct-coupled amplifier. This circuit has good control characteristics and low distortion.

The microphone mixing circuit is equipped with a 3-chip dedicated amplifier independent of other program sources.

You can also record the mixed signal to tape using the Pre-out jack.

The FM tuner section uses a low-noise FET and 3-series variable capacitor in the front end, a differential amplifier IC with good limiter characteristics and ceramic filter in the IF stage, and a dedicated IC in the MPX circuit to achieve high sensitivity and high selectivity.

Since the AM tuner section is designed with an emphasis on sound quality, it realizes AM reception with less interference and beat with adjacent stations and without distortion.

Uses a 2-meter system for signal and tuning.

It is equipped with two FM antenna terminals, an FM muting circuit and a loudness switch."