ROTEL RX-400A
¥ 45,800 (around 1973)
Commentary
Stereo receiver with built-in 4 ch speaker matrix.
The FM front-end uses a three link varicon and a high-sensitivity low-noise FET.
It also uses a 6-stage amplifying IF circuit and ceramic filter.
Uses SEPP output circuit.
Model Rating
Type | FM/AM stereo receiver |
<Audio section> | |
Music Power (IHF) | 80W (4 Ω) 60W (8 Ω) |
Effective power | Single-channel Drive : 20W/20W (8 Ω) Double-channel drive : 17W + 17W (8 Ω) |
Harmonic distortion factor (1 kHz) | 0.3% (at 15W output) 0.2% (at 1W output) |
Intermodulation distortion factor (70 hz : 7 khz = 4 : 1) | 0.2% (at 15W output) 0.15% at 1W output |
Frequency characteristic | 15 Hz ~ 70 kHz (at 1W Output) 17 Hz ~ 55 kHz (at 20W Output) |
Output band characteristic | 20 Hz to 40 kHz |
Damping factor | 30 (8 Ω) |
Signal-to-noise ratio | Phono:60dB Aux:70dB |
Residual noise | 1mV |
Input Sensitivity / Impedance | Phono : 3mV/50k Ω Aux : 200mV/100k Ω Tape in : 400mV/15k Ω |
Tone control | Bass : ± 13 dB (50 Hz) Trebel : ± 13 dB (10 kHz) |
Loudness control | +10dB(50Hz) |
FM Tuner Section | |
Antenna impedance | 300 Ω balanced / 75 Ω unbalanced |
Sensitivity (IHF) | 2.0 μ V |
Harmonic distortion factor (400 Hz, 100% modulation) | mono:0.5% stereo:1% |
Signal-to-noise ratio | 65 dB or more |
Image interference ratio | 50 dB or more |
Spurious response | 80dB |
Intermediate frequency interference ratio | 80dB |
Capture ratio | 3dB |
Selectivity (IHF) | 45dB |
Separation | 35 dB or More (1 kHz) |
SCA suppression ratio | 60dB |
AM suppression ratio | 40dB |
Stereo mono auto level | 50 μ V |
<AM Tuner Section> | |
Practical sensitivity | 25 μ V (S/N = 20 db) |
Image Ratio (1 mhz) | 50dB |
Intermediate frequency interference ratio (1 MHz) | 50dB |
Signal-to-noise ratio | 50dB |
<General> | |
Semiconductor used | Transistor : 40 FET : 1 Diode : 21 Ceramic Filter : 1 |
Power consumption | 140VA |
External dimensions | Width 435x Height 130x Depth 320 mm |
Weight | 7kg |