YAMAHA T-5D
¥ 34,800 (around 1981)
Commentary
An improved FM/AM tuner based on the T-5.
The front end is equipped with a high-precision wide-air-gap 3-row varicon and low-noise J-FET with excellent high-frequency characteristics to improve high sensitivity and various kinds of interference rejection characteristics.
The IF stage employs a ceramic filter with high transmission characteristics equivalent to six elements to achieve both high frequency and audio characteristics.
The MPX circuit that splits FM signals into L/R signals uses Yamaha's proprietary DC-NFB switching circuit based on a high-slew rate DC amplifier.
In the same way as audio amplifiers, distortion and noise are reduced from the very low band to the high band because NFB (negative feedback) is applied to improve the performance.
An optical balance type is used for the tuning meter.
Green LEDs are arranged on the left and right sides of the red LED dial indicator. When the brightness of the green LEDs on the right and left matches, the best separation and minimum distortion are achieved.
Equipped with a signal meter, a disturbance detection filter and AGC amplifier display a wide range of input levels on a high-speed response 6-point LED.
In addition, Yamaha's proprietary interference detection method makes it possible to indicate unwanted radio waves, such as multipath and fading, without saturation even at strong stations, as low indication values or with fringing.
A newly developed loop antenna is used in the AM tuner section.
In addition, AM muting circuit is mounted.
Built-in REC CAL is used as a guide for setting the recording level on a cassette deck, etc.
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Model Rating
| Type | AM/FM stereo tuner | ||||
| FM Tuner Section | |||||
| Receiving frequency | 76 MHz to 90 MHz | ||||
| 50 dB S/N sensitivity | Mono : 3 μ V (14.8 dBf) Stereo : 40 μ V (37.3 dBf) |
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| Practical Sensitivity (84 mhz) | 300 Ω : 2.4 μ V (12.8 dBf) 75 Ω : 1.2 μ V (12.8 dBf) |
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| Limiter sensitivity | 1.58 μ V (9.2 dBf) | ||||
| Image interference ratio | 65dB | ||||
| IF interference ratio | 100dB | ||||
| Spurious interference ratio | 90dB | ||||
| AM suppression ratio | 60dB | ||||
| Capture ratio | 1.5dB | ||||
| Effective selectivity | 65dB | ||||
| Signal-to-noise ratio | mono:86dB stereo:84dB |
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| Total harmonic distortion factor |
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| IM (intermodulation) distortion factor | mono:0.05% stereo:0.1% |
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| Stereo separation | 50Hz:50dB 1kHz:55dB 10kHz:45dB |
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| Frequency characteristic | 50 Hz to 10 kHz, ± 0.3 dB 30 Hz to 15 kHz, + 0.5 -1dB |
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| Subcarrier suppression ratio | 55dB | ||||
| Muting level | 3 μ V (14.8 dBf) | ||||
| Signal meter saturation level | 100 μ V (45.2 dBf) | ||||
| <AM Tuner Section> | |||||
| Receiving frequency | 525 kHz to 1605 kHz | ||||
| Practical sensitivity | 10 μ V | ||||
| Selectivity | 27dB | ||||
| Signal-to-noise ratio | 55dB | ||||
| Image interference ratio | 45dB | ||||
| Spurious interference ratio | 50dB | ||||
| Total harmonic distortion factor | 0.3%(1kHz) | ||||
| <General> | |||||
| Output Level / Impedance | FM (100% modulation 1 kHz) : 500mV/5.2k Ω AM (30% modulation at 1 kHz) : 180mV/5.2k Ω Rec Cal (333 Hz) : 250mV/5.2k Ω |
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| Semiconductor used | Transistor : 19 IC : 6 FET : 1 LED : 10 pcs Diode : 17 pcs |
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| Power supply voltage | 100 VAC, 50Hz/60Hz | ||||
| Rated power consumption | 8W | ||||
| External dimensions | Width 435x Height 93x Depth 300.5 mm | ||||
| Weight | 3.7kg | ||||