SANSUI TU-5900
¥ 46,500 (around 1976)
Commentary
FM/AM tuner developed with the theme of high-fidelity FM stereo playback.
The RF stage of the front end section uses a dual-gate MOS-type FET with excellent high-frequency characteristics and low noise. It is combined with a frequency-straight-line-type four variable capacitor with high tuning accuracy and precision finish, so that it has a sufficient ability to eliminate interfering signals.
The IF section uses a 3-stage (6-element) 2-element ceramic filter with a wide bandwidth and excellent selectivity characteristics to improve the selectivity characteristics. The limiter stage uses a highly integrated monolithic IC to obtain high limiter characteristics, resulting in stable reception and excellent S/N ratio.
Wide-band quadrature detection has been adopted in the detection stage to achieve a significant reduction in distortion.
In the MPX section, PLL system using IC is adopted, and excellent separation characteristics and low distortion factor are obtained.
The AM tuner is designed with high sensitivity by adding one stage RF1 in addition to high-integration ICs. In particular, by using Yaman type 2-element ceramic filters and ICs in the IF section, the circuit has less distortion.
In addition, a whistle filter circuit is installed to prevent beat sound that occurs at night, etc., to improve the sound quality of AM broadcasting.
A well-regulated power transformer is used for the power supply.
In addition, a stabilized power supply by a constant voltage power supply circuit is supplied to all stages, and each block stage realizes highly stable operation.
Equipped with an FM MPX noise canceler, it can cut high-frequency noise generated during FM stereo reception.
Equipped with two FM antenna input terminals.
Equipped with an FM antenna attenuator switch, it can receive FM broadcasts at the optimum input level according to the level of strong or weak radio waves.
Equipped with an output volume, the output level can be adjusted.
An output terminal for recording is also provided.
Ferrite bar antenna is mounted.
The front panel uses an anodized black panel that brings out the hairline.
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Model Rating
| Type | FM/AM Tuner |
| FM Tuner Section | |
| Practical sensitivity (IHF) | 1.8 μ V/10.3 dBf (new IHF) (Maximum Allowable Input 125 dB or More) |
| S/N50dB sensitivity | Mono : 3.5 μ V/16dBf (new IHF) Stereo : 45 μ V/38dBf (new IHF) |
| Total harmonic distortion factor | Mono : 0.25% or less (1 kHz) Stereo : 0.35% or less (1 kHz) |
| Signal-to-noise ratio | Mono : 70 dB or higher Stereo : 60 dB or more |
| Effective selectivity | 60 dB or More (± 400 kHz) |
| Capture ratio | 2.0 dB or less |
| AM suppression ratio | 55 dB or more |
| Image interference ratio (IHF) | 50 dB or More (83 MHz) |
| IF disturbance ratio (IHF) | 75 dB or More (83 MHz) |
| Spurious interference ratio (IHF) | 65 dB or More (83 MHz) |
| Stereo Separation (IHF) | 30 dB or More (100 Hz) 40 dB or More (1 kHz) 30 dB or More (10 kHz) |
| Frequency Response (IHF) | 30 Hz to 15 kHz + 1 -2dB |
| <AM Tuner Section> | |
| Sensitivity (bar antenna) | 50dB/m(1,000Hz) |
| Selectivity | 30 dB or More (1,000 Hz ± 10 kHz) |
| Image interference ratio | 30dB/m or more (1,000 Hz) |
| IF Rejection | 30dB/m or more (1,000 Hz) |
| <General> | |
| Output Voltage (FM100% Modulation) | Variable Output : 0 ~ 775 mV Recording output : 400 mV |
| Power consumption | 18W |
| External dimensions | Width 430x Height 132x Depth 243 mm |
| Weight | 6.4kg |