SONY STR-6500

Commentary

FM/AM stereo receiver planned and designed to spread the high performance of the ES series to a wider range of users.

A silicon transistor is used in the amplifier section to reduce distortion.

The tuner section adopts a direct mixer system using a 4-row precision varicon.
This method does not use any active devices such as transistors that generate cross-modulation distortion in the high-frequency region. Instead, radio waves are introduced directly into the mixing stage from three tuning circuits. This method was realized for the first time with a newly developed low-noise FET.
In addition, excellent selectivity characteristics have been obtained by adopting a solid-state filter composed of six elements.

Equipped with a quick access switch, you can instantly switch between the commonly used phono, tuner and aux with a lever.

It is equipped with a special high filter to reduce noise when receiving weak radio waves at FM stereo broadcast transmission. This filter also has a high blend function to mix the high sound part of the left and right.

It is equipped with a loudness switch.

It is equipped with a monitor switch. When recording to a 3-head tape recorder, this switch allows you to switch between the source and tape for trial listening.

There is also an aux jack on the front for connection to other devices.

A FET is also used in the AM tuner to reduce noise, and a double-tuned ceramic filter prevents interference.

Equipped with a tuning meter.

Uses FM equally spaced scale dial.

Green dial illumination is used.

It has a headphone port.

There were separately sold Eurasian cheek finish wood cases and mount brackets.

Model Rating

Type	FM/AM Receiver
FM Tuner Section
Receiving frequency	76 MHz to 90 MHz
Practical sensitivity	2.0 μ V ± 1 dB (IHF)
Signal-to-noise ratio	70dB
Capture ratio	2.0dB
Selectivity	70dB(IHF)
Image interference ratio	75dB
Intermediate frequency interference ratio	90dB
Spurious interference ratio	100dB
AM suppression ratio	50dB
Frequency characteristic	30 Hz to 15 kHz ± 1 dB
Distortion Factor (400 Hz, 100% Modulation)	mono:0.4% stereo:0.5%
FM stereo separation	40 dB or More (400 Hz)
Automatic stereo switching level	5 μ V
19 khz and 38 khz suppression ratio	54dB
Antenna	300 Ω Balanced Type
<AM Tuner Section>
Receiving frequency	530 kHz to 1,605 kHz
Sensitivity	Bar antenna : 48dB/m External antenna : 20 μ V
S/N	46 dB at 5 mV input
Image interference ratio	45dB(1400kHz)
Intermediate frequency interference ratio	40dB(1000kHz)
Distortion factor	0.8% (at 5 mv input)
Antenna	Ferrite bar antenna With External Terminal
Amplifier Unit
Dynamic Power	44W (8 Ω, both channels operating)
Rated output	15W + 15W (8 Ω) 13W + 13W (16 Ω)
Damping factor	25 (8 Ω) 50 (16 Ω)
Cross modulation distortion factor	0.5% or Less (Rated Output) 0.2% or Less (at 0.5W Output)
Harmonic distortion factor (1 kHz)	0.5% or Less (Rated Output) 0.1% or Less (at 0.5W Output)
Frequency characteristic	Phono inputs : RIAA standard Aux, Tape, Rec/PB (input) : 20 Hz ~ 60 kHz + 0 -3dB
S/N ratio (IHF, A-curve correction, input short At rated output)	Phono : 70 dB or more (input 3 mV) Aux : 70 dB or more (input 500 mV) Tape : 90 dB or more (input 500 mV)
Tone control	Bass : ± 10 dB (100 Hz) Treble : ± 10 dB (10 kHz)
High filter	5 kHz or more, 6dB/oct.
Loudness control (at volume -30dB)	+ 8 dB at 50 Hz, + 3 dB at 10 kHz
Input Sensitivity / Impedance	Phono : 2.5mV/47k Ω Aux1, 2, Tape, Rec/PB (input) : 250mV/100k Ω
Output Level / Impedance	Rec : 250mV/10k Ω Rec/PB (Output) Speaker : 4 Ω ~ 16 Ω Headphone : 8 Ω or more
<General>
Semiconductor used	Transistor : 40 FET:2 Diode : 25 pcs
Pwer	100 VAC, 50Hz/60Hz
Power outlet	Power switch not linked : 1 system, 500W
Power consumption	Maximum power : 80W No signal : 20W
External dimensions	Width 400x Height 145x Depth 310 mm
Weight	7.25kg
Attachment	Ribbon antenna White pin plug Red pin plug Binaural plug
Sold Separately	Wood Case TAC-1 (¥ 4,600) Mount Bracket MB-5 (¥ 2,800)