TRIO KR-80

Commentary

A stereo receiver equipped with a synthesizer type FM/AM tuner.

A voltage synthesizer is used in the tuner section, and the tuning point is firmly held by the automatic tuning correction function. A 3-stage varicap tuning circuit is mounted in the front end, and a PLL circuit is used in the MPX section.
In addition, a Local/DX changeover switch is mounted so that clear reception can be performed even in a strong electric field region.

A newly developed loop antenna is used for the AM antenna. Compared to conventional bar antennas, this antenna is more resistant to noise generated by fluorescent lamps and televisions, enabling better AM reception.

You can preset a total of 10 stations (5 FM stations and 5 AM stations) and call up the desired broadcasting station with one touch operation.
In addition, it is equipped with an auto-tuning mechanism. By simply pressing the Auto Tuning switch, the LED indicator automatically goes up / down, and the station is automatically found and tuned.

It is equipped with a memory backup mechanism by lithium battery, and once it is stored, you will not forget the preset frequency for about 10 years.

It is equipped with a last channel memory mechanism that stores the broadcasting station you were listening to before turning off the power switch.

The amplifier section uses a simple circuit consisting of an equalizer amplifier and a high-gain power amplifier. The power amplifier section has a DC configuration to improve overall characteristics.

It is equipped with a microphone mixing circuit, 2 pairs of tape monitor switches and LED power display.

By connecting to the program timer AT-500 (sold separately), you can program the listening schedule for one week of FM.

Model Rating

Type	AM/FM synthesizer receiver
Amplifier Unit (Tuner Tape → SP Out)
Rated Output (Both Channel Operation)	27W + 27W (8 ohm, 20 hz to 20 khz) 31W + 31W (8 ohm, 1 khz)
Total harmonic distortion factor (8 Ω)	Phono → SP out : 0.05% (20 Hz, 20 Hz to 20 kHz) Tuner Tape → SP out : 0.015% (1 kHz at rated output) 0.015% (20 Hz to 20 kHz at 1/2 Rated Output)
Frequency characteristic	5 hz ~ 130 khz + 0. 5-3 db
Intermodulation distortion factor (60 hz : 7 khz = 4 : 1)	0.02% (at rated output)
Output Bandwidth (8 Ω at 0.05% distortion rate)	5 Hz to 30 kHz (IHF)
Signal-to-noise ratio	Phono:78dB(IHF-A) Tape Play:105dB MIC:72dB
Tone control	Bass : 100 Hz ± 8 dB Treble : 10 kHz ± 8 dB
High filter	5 kHz, 6dB/oct.
Loudness control	100Hz:+10dB(Volume-30dB)
Damping factor	45 (1 kHz, 8 Ω)
Input Sensitivity / Impedance	Phono : 2.5mV/50k Ω Tuner, Tape : 150mV/50k Ω MIC : 3mV/50k Ω
Output Level / Impedance	150mV/300 Ω
Equalizer Section (Phono → Tape Rec)
Phono maximum allowable input	160 mv (1 khz, 0.05% distortion rate)
Phono RIAA deviation (20 Hz to 20 kHz)	± 0.3 dB
FM Tuner Section
Receiving frequency	76 MHz to 90 MHz
Antenna impedance	300 Ω equilibrium 75 Ω unbalance
Sensitivity	75 Ω : 0.95 μ V 300 Ω : 10.3 dBf (new IHF) / 1.8 μ V (IHF)
Distortion factor	mono: 0.1%(100Hz) 0.1%(1kHz) 0.3% (50 Hz to 10 kHz) stereo: 0.19%(100Hz) 0.10%(1kHz) 0.355 (50 Hz to 10 kHz)
Signal-to-noise ratio (100% modulation, 1 mv input)	mono:75dB stereo:69dB
Image interference ratio	58dB
Selectivity (IHF)	50dB
IF interference ratio	105dB
Spurious interference ratio	85dB
AM suppression ratio	60dB
Capture ratio	1.0dB
Stereo separation	47dB(1kHz) 35 dB (50 Hz to 10 kHz) 33dB(15kHz)
Frequency characteristic	30 Hz ~ 15 kHz + 0.5 -2dB
<AM Tuner Section>
Receiving frequency	530 kHz to 1605 kHz
Sensitivity	Loop antenna : 15 μ V (IHF) 630 μ V/m
Distortion factor	0.5%
SN ratio (30% modulation 1 mV input)	50dB
Selectivity (IHF)	40dB
IF interference ratio	24dB
<General>
Pwer	100 VAC, 50Hz/60Hz
AC outlet	Power switch interlock : 1 system Power switch not linked : 1 system
Rated power consumption	80W (Electrical Appliance and Material Control Law)
External dimensions	Width 440x Height 78x Depth 336 mm
Weight	6.1kg