YAMAHA T-5

Commentary

This is an AM/FM stereo tuner that incorporates Yamaha's proprietary technology and is also easy to use for anyone.

The circuit configuration consists of a front end using a 3-row varicon and J-FET, an IF stage using a newly developed uniresonance ceramic filter, a wide-range balanced type ratio detector, a DC-NFB-PLL stereo decoder, and an audio stage. Along with the AM section using a low-impedance loop antenna, the design emphasizes sound quality.

The front end uses a wide-air-gap 3-row varicon and low-noise J-FET with excellent high-frequency characteristics, and realizes excellent interference rejection characteristics that cut unnecessary radio waves sharply.

The IF stage consists of three elements of a uniresonance ceramic filter designed to achieve both high frequency and audio characteristics, one stage transistor + a differential amplifier circuit with a current limiter excellent in the limiter effect.

The MPX circuit uses Yamaha's original DC-NFB switching circuit based on a high-through-rate DC amplifier in order to transmit signals without leakage.
In terms of circuitry, all amplifiers in the signal system are DC high-speed, high-speed amplifiers, and most of them are integrated circuits.
This IC contains 140 transistors, 140 resistors, and approximately 290 other elements such as diodes and capacitors in a 20-pin dual package. It consists of an audio amplifier and a DC amplifier with NFB applied to improve the characteristics. This reduces distortion and noise from the very low band to the high band.

The tuning meter uses an optical balance type tuning meter with a red LED dial indicator and a green LED on the left and right sides. When the brightness of the left and right LEDs matches, the separation is best.

The signal meter uses an interference detection filter and AGC amplifier to accurately display a wide range of input levels with a high-speed response 6-point LED.
In addition, Yamaha's original interference detection method indicates unwanted radio waves such as multipath fading as a decrease in indication value or wamble without saturation up to strong input.

It is equipped with a low-impedance loop antenna and a circuit configuration that emphasizes sound quality so that even AM can enjoy good sound.

It is equipped with a circuit for generating a test signal (333 Hz) that can be used as the recording level on a cassette deck, etc.

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 (38 dBf)
Practical Sensitivity (84 mhz)	300 Ω : 1.7 μ V (9.8 dBf) 75 Ω : 0.85 μ V (9.8 dBf)
Image interference ratio (84 MHz)	60dB
IF Interference Ratio (84 MHz)	90dB
Spurious interference ratio (84 MHz)	80dB
AM suppression ratio (IHF)	60dB
Capture Ratio (IHF)	1.5dB
Effective selectivity (IHF)	50dB
Signal-to-noise ratio	mono:84dB stereo:80dB
Total harmonic distortion factor	mono 100Hz:0.05% 1kHz:0.05% 6kHz:0.08% 10kHz:0.1% stereo 100Hz:0.1% 1kHz:0.07% 6kHz:0.1% 10kHz:0.15%
IM (intermodulation) distortion factor	mono:0.05% stereo:0.1%
Stereo separation	1kHz:50dB 50 Hz to 10 kHz : 45 dB
Frequency characteristic	50 Hz to 10 kHz, ± 0.3 dB 30 Hz to 15 kHz, + 0.3 -1dB
Subcarrier suppression ratio	35dB
Muting level	5 μ V
<AM Tuner Section>
Receiving frequency	525 kHz to 1605 kHz
Practical sensitivity (IHF)	15 μ V
Selectivity (1000 kHz ± 9 kHz)	27dB
Signal-to-noise ratio	52dB
Image interference ratio	40dB
Spurious interference ratio	50dB
Total harmonic distortion factor	0.3%
<General>
Output Level / Impedance	FM (100% modulation at 1 kHz) : 500mV/4k Ω AM (30% modulation at 1 kHz) : 170mV/4k Ω Rec Cal (333 Hz, equivalent to 50% modulation output at FM) : 250mV/4k Ω
Rated voltage, frequency	100 V, 50Hz/60Hz
Rated power consumption	9W
External dimensions	Width 435x Height 92x Depth 341 mm
Weight	4.4kg