TRIO KT-7500

Commentary

FM/AM tuner with stable reception capability and strong interference rejection capability.

The front-end section is equipped with a highly stable dual-gate MOS FET and a four series frequency linear varicon. It has high sensitivity and large input characteristics sufficient for reception in strong electric fields. It is compatible with long-distance reception and reception in strong electric fields.

The IF stage uses a phase linear 6-element filter with excellent group delay characteristics and an LC circuit.
In addition, the device and material that are resistant to external conditions are used for the discri to eliminate drift. In addition, the quadrature detection circuit with a wide bandwidth achieves low distortion characteristics. At the same time, the offset voltage is adjusted to correct the tuning deviation and achieve excellent distortion factor characteristics.
In addition, the high-gain amplifier stage and 5-stage limiter using a high-integration IC eliminate the sound quality degradation due to interference.

For FM muting, the S-curve detection method realizes a narrow band, and at the same time, an FET switch control method is used for high signal level audio output.

The MPX section features a PLL that is resistant to aging and a ノイトン converted L/R separation type low-pass filter that realizes stable separation characteristics and an excellent carrier-leak suppression ratio.

The AM and IF stages employ a highly selective ceramic filter that combines two newly developed three terminal ceramic elements and a coil to obtain stable reception performance.
In addition, the RF stage has a spurious strap circuit that cuts off the outside of the reception band to eliminate beat interference from short wave bands that are difficult to hear at night.

There was a carrying handle sold separately.

Model Rating

Type	FM/AM Tuner
FM Tuner Section
Receiving frequency	76 MHz to 90 MHz
Antenna impedance	300 Ω equilibrium 75 Ω unbalance
Sensitivity (IHF)	1.8 μ V
Chinese arrowhead Slope (SN ratio 50 db)	Mono : 3.8 μ V Stereo : 45 μ V
Distortion Factor (400 Hz, 100% modulation)	mono:0.1% stereo:0.2%
Signal-to-noise ratio (100% modulation, 1 mv input)	mono:75dB stereo:68dB
Image ratio	85dB
Selectivity (IHF)	80dB
IF interference ratio	90dB
Harmonics spurious response	90dB
AM suppression ratio	60dB
Capture ratio	1.0dB
Stereo separation	45dB(400Hz) 35 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
<AM Tuner Section>
Receiving frequency	520 kHz to 1605 kHz
Sensitivity (IHF)	18 μ V
Distortion factor	0.5%
Signal-to-noise ratio (30% modulation, 1 mv input)	50dB
Image ratio	60dB
Selectivity (IHF)	35dB
<General>
Output Level / Impedance	FM (400 Hz, 100% modulation) : 0 V ~ 1.2V/2.5k Ω AM (400 Hz, 30% modulation) : 0 V ~ 0.3V/2.5k Ω FM det out : 250mV/1.5k Ω Multipath output : 0.2V/1k Ω
Power supply voltage	100 VAC, 50Hz/60Hz
Rated power consumption (Electrical Appliance and Material Control Law)	13W
External dimensions	Width 430x Height 149x Depth 376 mm
Weight	8kg
Sold Separately	Carrying Handle D-7 (1 set, ¥ 3,000)