Technics SA-5500
¥ 67,000 (around 1973)
Commentary
An FM/AM stereo receiver that combines an FM/AM tuner and pre-main amplifier.
The power amplifier section uses an all-stage direct-coupled differential amplifier OCL circuit without the output capacitor, which causes the degradation of low-frequency characteristics.
As a result, a smooth frequency characteristic is obtained from the ultra-low band to the ultra-high band, and the damping factor in the ultra-low band is kept flat.
The equalizer circuit of the preamp section employs a two stage direct connection configuration of PNP-NPN using carefully selected low-noise transistors.
The front end of the FM section is equipped with two FETs and four frequency linear type variable capacitor.
In addition, high input impedance, low noise 4-pole MOS FET is used for the first stage of RF, and 3 ceramic filters with 2 elements and 2 stages of retuned LC filter are used for the IF stage to realize excellent performance.
Uses an FM muting circuit using two LC filters.
The stereo MPX circuit uses a monolithic IC.
.JPG)
Model Rating
| Type | FM/AM stereo receiver |
| Amplifier Unit | |
| Music Power (IHF) | 70W (4 Ω) 50W (8 Ω) |
| Effective power (IHF) | 20W/20W (4 Ω) 17W/17W (8 Ω) |
| Power band wiz | 7 Hz to 40 kHz, -3dB |
| Frequency characteristic | AUX : 15 Hz ~ 50 kHz + 0 -3dB |
| Total harmonic distortion factor | 0.5% |
| Intermodulation distortion factor (60 Hz : 7 kHz = 4 : 1 at effective output) | 0.7% |
| Signal-to-noise ratio (IHF) | Phono:70dB AUX:90dB |
| Damping factor | 70 (at 8 Ω Load) |
| Input Sensitivity / Impedance | Phono (Low) : 2mv/50k Ω Phono (High) : 10mV/100k Ω AUX : 160mV/100k Ω |
| Tape monitor | Rec Out:160mV Playback : 160mV/100k Ω |
| Tone control | Bass : 50 Hz, + 13 to -14dB Treble : 10 kHz, ± 12 dB |
| High filter | 5 kHz, -6dB/oct. |
| Loudness control | 50 Hz, + 12 dB 10 kHz, + 5 dB |
| <FM Part> | |
| Receiving frequency | 76 MHz to 90 MHz |
| Sensitivity (IHF) | 1.8 μ V |
| Selectivity (IHF) | 70dB |
| Signal-to-noise ratio (IHF) | 60 dB (100% modulation, 1 kHz) |
| Capture ratio | 2dB |
| Image interference ratio | 90dB(83MHz) |
| IF interference ratio | 90dB(83MHz) |
| Spurious interference ratio | 75dB(83MHz) |
| AM suppression ratio | 45dB |
| Stereo separation | 35dB |
| Total harmonic distortion factor | 0.4% (100% modulation, 400 Hz) |
| <General> | |
| Semiconductor used | IC : 1 FET : 1 Transistor : 45 Diode : 22 pcs |
| Pwer | 100 VAC, 50/60Hz |
| Power consumption | Rated output : 70W |
| External dimensions | Width 406x Height 140x Depth 356 mm |
| Weight | 8.6kg |