SONY STR-6450

Commentary

This FM/AM receiver has improved overall performance while maintaining its usability as a receiver.

A newly developed FET is used for the front end of the tuner section.
Sony has also replaced the LC-type filters used in this class of receivers with Sony's proprietary solid-state filters.
In order to avoid unpleasant noise during tuning operation from station to station, a new concept of gain allocation is introduced, and comfortable operation with muting is enabled.

Solid state filter is also used for the AM part.

The amplifier section uses silicon transistors developed for audio applications to reduce distortion that makes sound muddy.

It can also be used as a stereo loudspeaker device by using either two microphones or a one point stereo microphone.
A single microphone can emit sound from both left and right speakers.

Equipped with a speaker selector switch that can be used by switching between two sets of speakers.

It is equipped with a loudness switch.

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 μ V (S/N : 30 dB)
Image interference ratio	50dB
Spurious interference ratio	78dB
AM suppression ratio	50dB
Capture ratio	1.6dB
Selectivity	55dB(IHF)
Signal-to-noise ratio	65dB
Frequency characteristic	30 Hz to 15 kHz, + 0 -2dB
Distortion Factor (400 Hz, 100% Modulation)	mono:0.3% stereo:0.8%
FM stereo separation	35 dB or More (400 Hz)
<AM Tuner Section>
Antenna terminal	Built-in bar antenna With External Antenna Terminal
Sensitivity	Bar antenna : 48dB/m External antenna : 30 μ V
Image interference ratio	55dB(1000kHz)
IF interference ratio	40dB(1000kHz)
Signal-to-noise ratio	50dB
Distortion factor	0.8%
Amplifier Unit
Output	Dynamic Power (IHF) : 44W (8 Ω) 47W (4 Ω) Effective output (1 kHz, half-channel) : 15/15W (8 Ω) 17/17W (4 Ω) Effective output (1 kHz, both channels) : 12W + 12W (8 Ω) 12W + 12W (4 Ω)
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
Harmonic distortion factor	0.8% or Less (Rated Output) 0.1% or Less (at 1W Output)
Cross modulation distortion factor (60Hz:7kHz=4:1)	0.8% or Less (Rated Output) 0.1% or Less (at 1W Output)
Frequency characteristic	Phono RIAA standard, AUX, Tape, Rec/PB : 30 Hz to 40 kHz, + 0 to 3 dB
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
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
Damping factor	25 (8 Ω)
Tone control	Treble : 10 kHz, ± 10 dB Bass : 100 Hz, ± 10 dB
Loudness switch (at -30dB)	50 Hz, + 6 dB 10 kHz, + 4 dB
<General>
Semiconductor used	Transistor : 39 FET:1 Diode : 21
Pwer	100 VAC, 50Hz/60Hz
Power outlet	300W, non-interlocked : 1 system
Power consumption	53W
External dimensions	Width 434x Height 144x Depth 345 mm
Weight	8kg
Attachment	Feeder antenna Fuse 2Ax2