LUXMAN 5T10
¥ 108,000 (released in August 1978)
Commentary
FM tuner of the laboratory reference series.
In order to ensure high tuning accuracy and stability for all receiving frequencies, it is equipped with LUX's unique CLL method. This method is a total control method that includes the front end of the tuner, the IF stage (intermediate frequency amplification stage), and the detection stage based on the transmission frequency of the crystal-controlled broadcasting station. Therefore, it is resistant to external conditions such as temperature and enables stable reception.
Like the PLL circuits that make up the feedback loop, the CLL circuit has a capture range that precisely matches the center frequency of the broadcasting station and a lock range that ensures stable reception. Therefore, once the radio wave of the broadcasting station enters the capture range and locks it, a strong feedback circuit keeps the reception state accurately synchronized. Therefore, even if a drift (reception frequency shift) occurs due to changes in external conditions, feedback is applied in the direction that follows the transmission frequency of the broadcasting station controlled by the crystal, and stable reception can be obtained.
The CLL circuit has a built-in re-lock circuit so that you don't have to re-lock the tuner when you turn it off.
It is equipped with an Accu-touch mechanism so that all tuning circuits can be adjusted to the accurate center frequency of the broadcasting station.
The Accu-Touch mechanism uses the control voltage of the CLL circuit to detect an accurate center point and mechanically lock the tuning knob. When the tuning knob is turned at the normal speed, the knob is temporarily locked (for approximately one second) as well as the response.
The IF stage is equipped with two IF stage bandwidth switching, wide and narrow, to achieve both excellent distortion factor characteristics and excellent selectivity characteristics.
At the standard wide position, two sets of wide-band block filters focusing on group delay characteristics are used to achieve low distortion rate characteristics, and at the narrow position, two sets of narrow-band ceramic filters are added to achieve high selectivity characteristics.
For the front end, a 5-row varicon dedicated for FM has been adopted in order to demonstrate various excellent characteristics after the IF stage, and the selectivity of each high-frequency amplifier circuit has been raised to ensure sufficient interference removal capability.
The IF stage combines a Kado Racea wide-band detection circuit that realizes low distortion and high SN ratio, and the MPX circuit with a pilot canceler to improve the phase characteristics of the low-pass filter.
In addition, DC amplifier configuration is adopted for the audio stage.
Model Rating
| Type | FM tuner | ||||
| Practical sensitivity of IHF | 1.7 μ V (9.8 dBf) | ||||
| 50 dB quieting sensitivity | 3.2 μ V (15.2 dBf) | ||||
| Signal-to-noise ratio | 80dB | ||||
| Frequency characteristic | Mono, stereo : 20 Hz to 17 kHz -0.5 dB | ||||
| Distortion factor |
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| Capture ratio | wide:0.8dB narrow:2dB |
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| 2 signal selectivity (± 400 kHz) | wide:30dB narrow:90dB |
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| Spurious characteristic | 100dB | ||||
| IF interference rejection ratio | 100dB | ||||
| Image ratio | 100dB | ||||
| Amplitude modulation suppression ratio | 62dB | ||||
| Separation |
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| Output Voltage / Impedance | Fix : 1V/100 Ω Variable : 0 V ~ 1V/100 Ω ~ 1.25k Ω |
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| Attachment | Tuning and locking mechanism IF bandwidth switching Multipath check circuit Test tone circuit for recording Center indicator Signal strength indicator FM muting circuit Muting level adjustment Time muting circuit Output level control Coaxial connector for 75 Ω |
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| Power supply voltage | 100 VAC, 50Hz/60Hz | ||||
| Power consumption (Electrical Appliance and Material Control Law) | 20W | ||||
| External dimensions | Width 442x Height 101x Depth 400 mm | ||||
| Weight | 7kg |
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