SONY STR-6550A
¥ 54,800 (released in 1973)
Commentary
An FM/AM stereo receiver with improved overall performance while maintaining its usability as a receiver.
Model changed from STR-6550.
The amplifier section uses a high-power IC developed especially for audio.
By using two power supplies (direct coupling method), the required output can be obtained at a low distortion rate.
Two microphones or a one point stereo microphone can be used as a stereo loudspeaker device.
In addition, it is equipped with a mixing device that can send microphone sound, record sound, FM broadcast sound, and tape sound together. You can edit the tape while adding narration. In addition, you can fade in and fade out the microphone using the mixing volume.
A newly developed junction FET is used for the front end of the tuner section.
In addition, a 2-element 1-package solid-state filter is used for the IF section, so that it can clearly receive weak broadcasts next to powerful stations.
A coil unit is used in the FM multiplex circuit to achieve nearly perfect blocking and improve stereo distortion and separation characteristics.
A new approach to gain allocation has been introduced to reduce unpleasant noise generated during tuning operation from station to station as well as with muting.
The AM tuner section uses a triple chain IFT including a solid state filter to improve beat interference, distortion, interference, noise, etc.
Equipped with a speaker selector switch that can be used by switching between 2 sets of speakers.
The preamp and main amp can be used separately.
Therefore, it can be upgraded to a multi-amplifier system.
Equipped with a loudness switch, it is effective even in the case of low volume such as late night.
Equipped with NF-type tone control.
Equipped with a high filter switch to cut out high-frequency noise.
The character displayed on the dial screen changes in conjunction with the function switch.
Equipped with pure electronic stereo, automatic monaural switching and stereo display lamp.
Equipped with a balanced volume.
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Model Rating
| Type | FM stereo / FM-AM receiver | ||||||||
| Circuit system | Quasi complimentary service SEPPP OTL circuit | ||||||||
| FM Tuner Section | |||||||||
| Antenna terminal | 300 Ω equilibrium | ||||||||
| Sensitivity | 2.2 μ v (IHF) 1.7 μ V (S/N : 30 dB) |
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| Image interference ratio | 55dB | ||||||||
| IF interference ratio | 90dB | ||||||||
| Spurious interference ratio | 78dB | ||||||||
| AM suppression ratio | 55dB | ||||||||
| Capture ratio | 1.5dB | ||||||||
| Selectivity | 60dB(IHF) | ||||||||
| Signal-to-noise ratio | 68dB | ||||||||
| Frequency characteristic | 30 Hz to 15 kHz, + 0 -2dB | ||||||||
| Distortion Factor (400 Hz, 100% Modulation) | mono:0.3% stereo:0.8% |
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| FM stereo separation | 35 dB or More (1 kHz) | ||||||||
| <AM Tuner Section> | |||||||||
| Antenna terminal | Built-in bar antenna With External Antenna Terminal |
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| Sensitivity | Bar antenna : 48dB/m External antenna : 30 μ V |
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| Image interference ratio | 56dB(1000kHz) | ||||||||
| IF interference ratio | 40dB(1000kHz) | ||||||||
| Signal-to-noise ratio | 50dB | ||||||||
| Distortion factor | 0.8% | ||||||||
| Amplifier Unit | |||||||||
| Output |
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| Output Level / Impedance | Recording Terminal : 250mV/10k Ω [REC/PB] Output : 30mV/82k Ω Headphone Output : 8 Ω ~ 10k Ω Speaker terminal : 4 Ω ~ 16 Ω |
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| Preamplifier / power amplifier terminal | Preamplifier output : 0.5V/5k Ω Power Amplifier Input : 0.5V/50k Ω |
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| Harmonic distortion factor | 0.8% or Less (Rated Output) 0.1% or Less (at 1W Output) |
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| Cross modulation distortion factor (60Hz:7kHz=4:1) |
0.8% or Less (Rated Output) 0.1% or Less (at 1W Output) |
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| Frequency characteristic | Phono RIAA standard Aux, Tape, Rec/PB (input) : 20 Hz ~ 40 kHz + 0 -3dB |
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| Input Level / Impedance (at rated output) |
Phono Terminal : 2.5mV/47k Ω My Kujac : 2.0mV/47k Ω AUX Terminal : 250mV/100k Ω Tape Terminal : 250mV/100k Ω [REC/PB] Input : 250mV/100k Ω |
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| Signal-to-noise ratio | Phono Terminal : 60 dB AUX terminal : 70 dB Tape Terminal : 80 dB [REC/PB] input : 80 dB My Kujac : 60 dB |
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| Damping factor | 25 (8 Ω) | ||||||||
| Tone control | Treble : 10 kHz, ± 10 dB Bass : 100 Hz, ± 10 dB |
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| High filter | 6dB/oct, 5 kHz or more | ||||||||
| Loudness switch (at -30dB) |
50 Hz, + 6 dB 10 kHz, + 4 dB |
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| <General> | |||||||||
| Semiconductor used | Transistor : 32 IC:2 FET:2 Diode : 22 |
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| Pwer | 100 VAC, 50Hz/60Hz | ||||||||
| Power outlet | 300W, non-interlocked : 1 system | ||||||||
| Power consumption | 63W | ||||||||
| External dimensions | Width 434x Height 145x Depth 348 mm | ||||||||
| Weight | 9kg | ||||||||
| Attachment | Feeder antenna Fuse 2Ax2 |
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