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Eico 753 User Manual

Eico 753
33 pages
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753/Tri-Band SSB/AM/CW Transceiver
753
-
Rev.I
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Eico 753 Specifications

General IconGeneral
Tuning MethodManual
Power SupplyInternal
TypeTransceiver
Modulation ModesCW
Power Input117 VAC, 60 Hz
Input Impedance50 ohms
Output Impedance50 ohms
Tubes12AX7, 12AT7, 6AQ5

Summary

GENERAL DESCRIPTION

FEATURES

Overview of the transceiver's key capabilities and technical specifications.

INSTALLATION PROCEDURES

Guidance for setting up and connecting the transceiver for operation.

INSTALLATION PROCEDURES

UNPACKING

Instructions for safely removing the transceiver from its packaging.

VENTILATION

Requirements for adequate airflow to prevent overheating.

ANTENNAS

Guidelines for connecting suitable antennas and connector types.

EXTERNAL RELAY CONTROL TERMINALS

Details on using external relay terminals for accessory control.

MOBILE MOUNTING

Instructions for installing the transceiver in a mobile environment.

MOBILE SPEAKER INSTALLATION

Guidance on connecting a speaker for mobile operation.

OPERATION

MICROPHONE CONNECTIONS

Instructions for connecting a microphone to the transceiver.

SSB OPERATION

Detailed procedures for setting up and tuning the transceiver for SSB mode.

RECEIVER TUNE-UP FOR SSB OPERATION

Steps to align the receiver for optimal SSB reception and performance.

TRANSMITTER TUNE-UP FOR SSB OPERATION

Steps to align the transmitter for optimal SSB output and tuning.

ADJUSTMENT OF MICROPHONE GAIN

Procedure for adjusting microphone gain for optimal transmit audio levels.

MAIN TUNING CONTROL

Explanation of the dual-ratio ball drive tuning mechanism.

RECEIVER OFFSET TUNING

How to fine-tune receiver frequency without altering transmitter frequency.

CW OPERATION

Procedures for operating the transceiver in CW mode.

AM OPERATION

Procedures for operating the transceiver in AM mode.

ADDITIONAL NOTES ON CONTROLS

MODE SWITCH

Explanation of the MODE switch functions in different operating modes.

PA TUNE & PA LOAD CONTROLS

Guidance on adjusting PA TUNE and PA LOAD controls for proper output.

ADDITIONAL NOTES ON CONTROLS

CARRIER BALANCE

Adjustment and effect of the CARRIER BALANCE control.

CALIBRATION ACTIVATION

How to activate the 100kc crystal oscillator calibrator.

AF GAIN CONTROL

Use of the AF GAIN control for audio volume.

RF GAIN CONTROL

Setting the RF GAIN control for desired S-meter reading.

S-METER ZERO ADJUSTMENT

Procedure to set the S-meter to zero for accurate signal strength readings.

CIRCUIT DESCRIPTION

TRANSMITTING

Detailed explanation of the transceiver's transmitting circuits.

RECEIVING

Detailed explanation of the transceiver's receiving circuits.

CIRCUIT DESCRIPTION

VOX CIRCUIT

Explanation of the Voice Operated Transmit (VOX) circuit.

MAINTENANCE

GENERAL

General maintenance advice, including tube replacement.

CABINET REMOVAL

Instructions for removing the transceiver's cabinet.

MAINTENANCE

ALIGNMENT PROCEDURE

Comprehensive steps for aligning the transceiver's circuits.

RECEIVER ALIGNMENT

Procedure for aligning the receiver section of the transceiver.

IF Strip

Steps to align the Intermediate Frequency (IF) strip of the receiver.

VFO

Steps to align the Variable Frequency Oscillator (VFO) for accurate tuning.

ALIGNMENT PROCEDURE

TRANSMITTER ALIGNMENT

Procedures for aligning the transmitter section of the transceiver.

CRYSTAL FILTER

Procedure for adjusting the transceiver's crystal filter for optimal performance.

DC VOLTAGE AND RESISTANCE CHART

VOLTAGE AND RESISTANCE CHART

Detailed table of tube pin voltages and resistances.

PARTS LIST

CAPACITORS

List of capacitors used in the transceiver with part numbers.

DIODES

List of diodes used in the transceiver with part numbers.

JACKS & SCREW TERMINAL BOARDS

List of connectors and terminal boards with part numbers.

COILS

List of coils used in the transceiver with part numbers.

METER

List of meters used in the transceiver with part numbers.

P. C. BOARDS

List of Printed Circuit (PC) boards with part numbers.

LAMPS

List of lamps used in the transceiver with part numbers.

PARASITIC TRAP

List of parasitic traps with part numbers.

RESISTORS & POTENTIOMETERS

List of resistors and potentiometers with part numbers.

RELAY

List of relays used in the transceiver with part numbers.

SWITCHES

List of switches used in the transceiver with part numbers.

TRANSFORMERS

List of transformers used in the transceiver with part numbers.

TERMINAL BOARDS

List of terminal boards used in the transceiver with part numbers.

TUBES AND TRANSISTORS

List of tubes and transistors with part numbers.

CRYSTALS

List of crystals used in the transceiver with part numbers.

CRYSTAL SOCKET

List of crystal sockets used in the transceiver with part numbers.

TUBE SOCKETS

List of tube sockets used in the transceiver with part numbers.

MISCELLANEOUS COMPONENTS & HARDWARE

List of miscellaneous components and hardware with part numbers.

EICO 753 SCHEMATIC DIAGRAM