TRIO KR-44
¥ 49,800 (around 1969)
Commentary
Solid state FM/AM receiver with wood-grain design.
Silicon transistor is used.
The equalizer amplifier section uses a direct connection method.
The direct-coupled amplification system is not affected by capacitors or hand-made equipment, so it can be amplified faithfully even at extremely low frequencies.
ITL-OTL circuit is used for the main amplifier section.
By removing the output transformer and input transformer, the trouble caused by the transformer is eliminated.
Equipped with a pure electronic power transistor protection circuit.
FET is used in the front end part to improve various characteristics such as interference rejection capability.
A high-gain IC is used in the IF stage to provide sufficient IF gain and high sensitivity.
Also, since the limiter is activated from the time of Chikara Oire, reception with good S/N and little distortion is possible.
Equipped with an FM mono-stereo automatic switching device, the circuit switches automatically when a stereo broadcast transmission is received.
The red lamp on the dial is lit during stereo reception.
An SCA filter is installed to prevent interference between SCA and FM broadcasts.
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Model Rating
| Type | FM/AM Receiver |
| FM Tuner Section | |
| Receiving frequency | 76 MHz to 90 MHz |
| Sensitivity (IHF standard) | 2 μ V |
| Distortion factor | 0.5% or less (400 Hz, 100% modulation) |
| Signal-to-noise ratio | 60 dB or More (100 μ V input, 100% modulation) |
| Frequency characteristic | 20 Hz ~ 20 kHz + 0 -2dB |
| Frequency drift | 0.02% |
| Antenna input impedance | 300 Ω, 75 Ω |
| Capture ratio | 2.5 dB or less |
| Image rejection | 60 dB or more |
| Harmonic spurious response | 80 dB or more |
| IF Rejection | 70 dB or more |
| Selectivity | 45 dB or more |
| Stereo separation | 35 dB or More (400 Hz) |
| <AM Tuner Section> | |
| Receiving frequency | 520 kHz to 1610 kHz |
| Sensitivity (IHF standard) | 15 μ V |
| Image rejection | 45 dB or more |
| Selectivity | 25 dB or more |
| IF Rejection | 60 dB or more |
| Amplifier Unit | |
| Music Power (IHF) | 45W ± 1 dB (4 Ω) 40W ± 1 dB (8 Ω) |
| Effective power | Single-channel operation : 20W/20W ± 1 dB (4 Ω) 19W/19W ± 1 db (8 Ω) Both channel operation : 14W + 14W ± 1 db (8 Ω) |
| Total harmonic distortion factor | 0.8% or Less (Rated Output) |
| Cross modulation distortion factor | 0.8% or Less (Rated Output) 0.2% or Less (Rated Output -3dB) |
| Frequency characteristic | 20 Hz to 30 kHz ± 1.5 dB |
| Output Bandwidth Characteristics (IHF) | 22 Hz to 20 kHz |
| Input sensitivity | Phono:2.5mV Aux, Tape play : 140 mv |
| Recorded output | Tape rec(Pin):140mV Tape rec(Din):28mV Dubbing:140mV |
| Maximum Input Voltage | Phono : 180 mV (P. P, 1 kHz) |
| Tone control | Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz) |
| Loudness control | + 10 dB (100 Hz), + 5 dB (10 kHz) |
| High filter | 3 kHz, 6dB/oct. |
| Signal-to-noise ratio | Phono:60dB Aux, Tape play : 70 dB |
| Residual noise | 0.8 mv (8 Ω) |
| Damping factor | 20 (8 Ω) |
| <General> | |
| Accessory circuit | FM mono to stereo automatic switching device Stereo display lamp SCA Filters AM bar antenna |
| Semiconductor used | Transistor : 33 FET : 2 IC : 2 Diode : 33 pcs |
| Pwer | 100 VAC / 117 V, 50Hz/60Hz |
| Power consumption | 15W (No signal) 60W (maximum output) |
| External dimensions | Width 420x Height 140x Depth 310 mm |
| Weight | 9kg |