TRIO KT-5500

Commentary

FM stereo tuner developed with emphasis on FM sound quality.

The front-end uses a frequency linear 5-row variable capacitor with a built-in oscillation circuit.
This varicon achieves excellent scale accuracy by strictly controlling the frequency with respect to the angle. In addition, stability is enhanced by the use of three dimensional wiring by making the station part into blocks, and frequency drift due to changes in temperature and humidity is suppressed.
In addition, three dual-gate MOS-type FETs are used in the two RF stage and the mixer stage to improve intermodulation and intermodulation.

The IF section uses a phase-linear 8-element filter with excellent group delay characteristics to obtain high selectivity, and the high-gain amplifier stage and 6-stage limiter prevent degradation of sound quality due to interference.
In addition, by using a wide-band quadrature detector circuit and adjusting the offset voltage, low-distortion characteristics are realized over a wide band.

The MPX section employs a new type of PLL that adds a current adjustment circuit to a multiplier circuit that demodulates stereo signals to reduce demodulation distortion.

The audio section uses a ± 2 power supply differential direct-coupled amplifier, and is designed with a wide dynamic range that can cover 300% overmodulation as well as a low distortion factor.

The muting circuit uses a relay muting circuit driven by a Schmidt trigger circuit.
Since the output obtained by AND-synthesizing the antenna input and the discri S curve is driven by a Schmitt trigger circuit, it is always possible to receive in a good condition.

Metal glazed semi-fixed volume, which is resistant to temperature and humidity changes, is used for the offset voltage adjustment part, the separation adjustment part, and the PLL-VCO adjustment part of the detection circuit to improve reliability.

In addition to the conventional 300 Ω and 75 Ω terminals, a 75 Ω F-type connector is used for the antenna terminal.

It is equipped with a rich output terminal.

There was a wood case sold separately.

Model Rating

Type	FM stereo tuner
Receiving frequency	76 MHz to 90 MHz
Antenna impedance	300 Ω equilibrium 75 Ω unbalance
Sensitivity (IHF)	1.7 μ V
SN ratio 50 dB quieting sensitivity	Mono : 3.7 μ V Stereo : 43 μ V
Distortion Factor (400 Hz, 100% modulation)	mono:0.1% stereo:0.15%
Signal-to-noise ratio (100% modulation, 1 mv input)	mono:75dB stereo:70dB
Image ratio	110dB
Selectivity (IHF)	85dB
IF interference ratio	100dB
Harmonics spurious response	120dB
AM suppression ratio	60dB
Capture ratio	1.0dB
Stereo separation	45dB(400Hz) 37 dB (50 Hz to 10 kHz)
Carrier leakage	65dB
Frequency characteristic	50 Hz ~ 10 kHz + 0.2 -0.3 dB 30 Hz to 15 kHz + 0.2 -1.5 dB
Output Level / Impedance	FM (400 Hz, 100% modulation) Variable : 0 ~ 1.5V/2.5k Ω Fixed : 0.7V/4.5k Ω FM det out:250mV Multipath output : 0.2 V
Power supply voltage	100 VAC, 50Hz/60Hz
Rated power consumption (Electrical Appliance and Material Control Law)	13W
External dimensions	Width 380x Height 140x Depth 255 mm
Weight	5.7kg
Sold Separately	Wood Case SRA-3000 (1 Set, ¥ 4,500)