SONY ST-5000

Commentary

ES series FM stereo tuner.

The front end section consists of two high-frequency amplification stages.
A four stage tuning circuit using a five row varicon made of steatite for precise measuring instrument has been constructed to realize a circuit with excellent interference signal rejection characteristics.

Equipped with a newly developed CDs-type RF attenuator.
CDs, an electric-optical-electric conversion element, has been applied for the first time to an FM tuner. Since this element is a perfectly linear resistive element, there is no cause of intermodulation, and there is no degradation of various characteristics even in a strong electric field of 3 V, so it can receive stably.
At the same time, a bandpass filter for the FM band and eliminates interference from other TV channels.

The 8-stage double-tuning selection circuit ensures sufficient transmission bandwidth of 300 kHz pass band and 500 kHz disk bandwidth while maintaining the characteristic of 60 dB effective selectivity of ± 400 kHz.
In addition, the AM component is eliminated by applying a 3-step symmetrical diode limiter.

A 16 kHz low-pass filter is used to suppress interference of 19 kHz and 38 kHz.

A stabilizing circuit is used for all power supply circuits for each stage, and a Zener diode is used for OSC for further stabilization.

A two meter configuration consisting of a tuner input meter and a tuning meter is adopted.

Uses CDs-type muting circuit.

CDs type stereo / mono automatic switching circuit is adopted.

Equipped with a high blend switch.

There were wooden case and mounting bracket case as an option sold separately.

Model Rating

Type	FM stereo tuner
Circuit system	Superheterodyne system
Receiving frequency	76 MHz to 90 MHz
Intermediate frequency	10.7MHz
Practical sensitivity	1.8 μ V (S/N 30 dB, 100% modulation, 75 Ω terminal used)
Signal-to-noise ratio	70 dB (input 1 mv, 100% modulation)
Capture ratio	1.5dB
Effective selectivity	60 dB or More (± 400 kHz)
Image interference ratio	90 dB or More (85 MHz)
IF interference ratio	90 dB or More (85 MHz)
AM suppression ratio	50 dB (FM400Hz, 100%, AM 1 kHz 30%)
Muting level	10 μ V ~ 1000 μ V
Frequency characteristic	20 Hz to 15 kHz ± 0.5 dB (deviation from 50 μ sec de-emphasis curve)
Antenna terminal	300 Ω equilibrium 75 Ω unbalance
Distortion factor	0.3% or Less (Stereo / Mono at 400 Hz, 100% Modulation)
Stereo separation	40 dB or more (400 Hz, 100% modulation) 30 dB or more (50 Hz to 10 kHz, 100% modulation) 20 dB or more (20 Hz to 15 kHz, 100% modulation)
Stereo display	By the stereo display lamp
Automatic stereo operating level	15 μ V
19 kHz, 38 kHz suppression	55 dB or more (70 dB overall)
Frequency drift	20kHz(AFC OFF)
Output Voltage / Impedance	Fixed output : 700mV/10k Ω (at 400 Hz, 100% modulation) L/R output deviation : within ± 0.5 dB Variable output : 2Vmax/1k Ω at 400 Hz at 100% modulation at maximum output
Semiconductor used	Transistor : 45 Diode : 30 pcs
Pwer	100 VAC, 50Hz/60Hz
Power consumption	17W
External dimensions	Width 400x Height 145x Depth 310 mm
Weight	8.2kg
Sold Separately	Eurasian Cheek Finish Wooden Case TAC-1 (¥ 4,600) Mounting Bracket MB-5 (¥ 2,800)