SONY STR-6450A
¥ 44,800 (released in 1973)
Commentary
An FM/AM stereo receiver with improved overall performance while maintaining its usability as a receiver.
Model changed from STR-6450.
The amplifier section uses a high-power IC developed especially for audio.
In addition, the required output can be obtained at low distortion rate by adopting 2 power supplies (direct coupling method).
Two microphones or a one point stereo microphone can be used as a stereo loudspeaker device.
A newly developed junction FET is used for the front end of the tuner section.
A 2-element, 1-package solid-state filter is used for the IF section, allowing clear reception of weak broadcasts next to powerful stations.
Coil units are used in the FM multiplex circuit to achieve almost perfect block design.
This improves the stereo distortion factor 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 part uses a triple chain IFT including a solid state filter.
Beat interference, distortion, interference and noise are improved.
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 pure electronic stereo, automatic monaural switching and stereo display lamp.
Equipped with a balanced volume.
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 : 30 Hz to 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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Loudness switch (at -30dB) |
50 Hz, + 6 dB 10 kHz, + 4 dB |
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<General> | |||||||||
Semiconductor used | Transistor : 27 IC:2 FET:2 Diode : 18 |
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Pwer | 100 VAC, 50Hz/60Hz | ||||||||
Power outlet | 300W, non-interlocked : 1 system | ||||||||
Power consumption | 53W | ||||||||
External dimensions | Width 434x Height 145x Depth 348 mm | ||||||||
Weight | 8.5kg | ||||||||
Attachment | Feeder antenna Fuse 2Ax2 |