SONY STR-7065

Commentary

A full-fledged FM/AM stereo receiver developed based on the same design concept as the ES Series as a receiver that can be considered as a premain.

The front end of the tuner section uses a high-performance linear frequency varicon and newly developed junction FET for a high-frequency amplifier circuit.
In addition, stable local oscillation circuit and FET mixer circuit are mounted.

The IF section employs a 2-element solid-state filter and IC, and achieves sharp reception capabilities such as excellent passband characteristics and interference rejection characteristics for the same channel and adjacent channels.

The newly developed MPX IC is used in the MPX stereo separation circuit.
In addition, by using the MPX coil unit with no adjustment, it is free from deterioration of characteristics due to aging, heat and moisture.

The AM section uses a triple-tuned IFT with a high-integration IC solid-state filter.

The power amplifier section uses a differential amplifier, two power supplies directly connected to all stages, and a pure complimentary service circuit.

High-voltage low-noise ICs specially developed by our semiconductor engineers for audio applications are used in the preamp section, equalizer and flat amplifier.
These ICs, combined with a differential amplifier circuit and a pure complimentary service circuit, realize excellent linearity and distortion factor characteristics.

The power amplifier section uses a speaker protection circuit.
In addition, it is equipped with a circuit breaker to protect the power amplifier circuit. When an excessive current flows due to poor connection, etc., the circuit operates in advance so that the speaker or amplifier will not be damaged.

The tone control circuit uses an NFB-type tone control circuit with simple characteristics and low distortion and is designed to work smoothly without losing the naturalness of the mid-range.

With a built-in dedicated microphone amplifier, you can always set the correct level with the microphone level control.
In addition, the mixing circuit allows you to mix with any source and record mixing with the source.

It uses an input meter that shows the strength of radio waves and a tuning meter at Center 0.

Equipped with a function indicator. The position of the function is verified in the dial, and the dial face is dimmed except for FM and AM.

Uses a muting circuit with FET switches.

Built-in high-blend circuit linked with High and Both filter switches.
Effective for stereo reception in weak electrolysis.

Since there are two types of tape input, two decks can be connected, and two devices can record simultaneously.

Equipped with a tape-to-tape mechanism that enables tape copying from deck to deck without changing the connection between 1 → 2 and 2 → 1.

It is equipped with a loudness switch.

It uses a four position, active-type filter circuit from High-OFF (flat) to Low-Both (bandpass).
It is effective for noise such as scratch noise and ground noise.

The power input mode can be changed by the mode switch.

Equipped with headphone output terminal.

Tape Monitor 1 takes precedence over Tape Monitor 2, and Tape1 can be monitored with one touch during monitoring of Tape2.

Equipped with a change-over switch that can be used for Route 3 speaker system.
It can be used in 5 ways such as A, B, C, A + B, and A + C.

Pre-power and power can be separated.

Model Rating

Type	All-silicon transistor FM/AM stereo receiver
Circuit system	Power amplifier 2 power supply Direct coupling pure complimentary service SEPP circuit
FM Tuner Section
Receiving frequency	76 MHz to 90 MHz
Sensitivity	2 μ V (IHF) 1.6 μ V (S/N : 30 dB)
S/N	70dB
Capture ratio	1.0dB
Selectivity	70dB(IHF)
Image interference ratio	70dB
Intermediate frequency interference ratio	100dB
Spurious interference ratio	90dB
AM suppression ratio	56dB
Frequency characteristic	20 Hz to 15 kHz, ± 1 dB
Distortion factor	Mono : 0.2% (400 Hz, 100% modulation) Stereo : 0.5% (400 Hz, 100% modulation)
Separation	38 dB or More (400 Hz)
Antenna terminal	300 Ω Balanced Type 75 Ω Unbalanced Type
<AM Tuner Section>
Receiving frequency	530 kHz to 1605 kHz
Intermediate frequency	455kHz
Sensitivity	53dB/m (when bar antenna is used) 30 μ V (when external antenna is used)
S/N	50dB
Image interference ratio	50dB(1000kHz)
IF interference ratio	40dB(1000kHz)
Distortion factor	0.8%
Antenna	Ferrite bar antenna With External Terminal
Power Amplifier Unit
Output	Dynamic Power (IHF) : 380W (4 Ω) 240W (8 Ω) Effective output (1 kHz, half-channel) : 110W/110W (4 Ω) 85W/85W (8 Ω) Effective output (1 kHz, both channels) : 85W + 85W (4 Ω) 70W + 70W (8 Ω) Effective output (20 Hz to 20 kHz, both channels) : 60W + 60W (8 Ω)
Cross modulation distortion factor	0.2% or Less (Rated Output) 0.1% or Less (at 1W Output)
Cross modulation distortion factor (60Hz:7kHz=4:1)	0.2% (at rated output) 0.1% or Less (at 1W Output)
Frequency response (at 1W output)	10 Hz to 100 kHz, + 0 -1dB
Input Sensitivity / Impedance	1V/50k Ω (at Rated Output)
Signal-to-noise ratio	110 dB or more
Damping factor	50 or More (1 kHz, 8 Ω)
Preamplifier Section
Input Sensitivity / Impedance	Phono : 2mV/47k Ω AUX, Tape1, 2, REC/PB (Input) : 150mV/50k Ω MIC:1.6mV
Signal-to-noise ratio	Phono : 72 dB or more (input 3 mV, B network) Aux, Tape1, 2 rec / PB (input section) : 90 dB or more (input 250 mV, A network) MIC : 65 dB (1.6 mV, B network)
Output Level / Impedance	Rec Out : 250mV/10k Ω Pre Out : 1V/4.7k Ω REC/PB (Output Part) : 30mV/82k Ω
Frequency characteristic	Phono : RIAA curve ± 1 dB Aux, Tape, REC/PB (Input) : 10 Hz ~ 70 kHz, + 0 -3dB MIC : 100 Hz to 10 kHz, + 0 -3dB
Tone control	Bass : 100 Hz, ± 10 dB Treble : 10 kHz, ± 10 dB
Filter	Low Filter : 50 Hz, 12dB/oct. High Filter : 9 kHz, 12dB/oct.
<General>
Semiconductor used	Transistor : 53 IC:5 Diode : 31
Pwer	100 VAC, 50Hz/60Hz
Power outlet	Integration : 2 x 200 w Non-integrated : 1 x 200 w
Power consumption	180W
External dimensions	Width 471x Height 157x Depth 375 mm
Weight	15.2 kg, 18.9 kg (including packaging)