Sony ST 5055L Owners Manual

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SONY.

FM STEREO/FM-AM TUNER

ST-5055L

OWNER'S INSTRUCTION MANUAL

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Intensive research combined with superior engineering and careful
workmanship offers you high performance FM stereo FM-MW»LW
tuner. Model ST-5055L.

Sensitivity. interference rejection, and other vital factors which
affect the quality of a tuner are greatly determined by the char-
acteristics of its front end. The front end of this tuner hes
newlydeveloped junction FET's in the mixer and RF stages.
This results in exceptionally~high sensitivity, image rejection.
spurious rejection. and low internal noise.

The FM IF section employs a newlyodeveloped. high-reliability
IC and solid-state filters that assure superior capture ratio. good
AM suppression. high signal-to-noise ratio and excellent w
lectivity. The FM discriminator section uses a permanently-tuned
solid-state discriminator. thus it achieves extremely stable demo-
dulation with good AM suppression. These components used
in the ST-5056L assure the tuner's high performance and long-
term stability.

The FM multiplex section employs a high-reliability IC and newly-
designed coil units for matching the IC. They provide optimum
stereo separation and durability.

The AM tuner employs triple-tuned solid-state filters and an AGC
circuit to maintain high sensitivity. minimum distortion. and
superior signal-to-noise ratio. AM programs will be received
with an audio quality that will surprise hi-fi oriented ears. Thc
built-in ferrite bar aerial assures stable AM (MW and LW) tuning.

Two switches are provided for best FM listening: One is for
muting the FM interstation noise; the other is for reducing the
background noise when the FM stereo signal is very weak. The
tuner-input level meter indicates the signal strength. and is also
useful for correct tuning. Precision tuning is easy with the
long, accurate. slide-rule dial. Additional features are two pairs
of outputs; variable and fixed.

To obtain maximum performance and enjoyment from your tuner.
please study these instructions carefully. Installation and oper-
ation of the tuner is not complicated. but the flexibility provided
by its many features may not be fully appreciated unless you
spend a little time gaining familiarity with its controls and
connection facilities. Keep this manual handy for future re-
ference.

TABLE OF CONTENTS
PREPARING FOR use

Unpacking ..................................................................... 3
Connection to the Local Mains Supply ........................... 3
System Connections ...................................................... 4
Notes on connections ................................................... 6
Aerials ........................................................................ 5
Output connections ...................................................... 7
Signal earth connection ................................................ 7
OPERATING INSTRUCTIONS
Location and Function of Controls ................................. 8
How to Use Your Tuner for FM Reception ..................... 9
How to Use Your Tuner for AM Reception ..................... 9
Level Controls ............................................................... 10
CARE OF YOUR TUNER
Cleaning ........................................................................ 10
Trouble Checks ............................................................... 10
TECHNICAL DATA
Technical Specifications ................................................... 11
Block Diagram ............................................................... 12