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QUAD 303 User Manual

QUAD 303
29 pages
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QUAD 303 Specifications

General IconGeneral
Power Output45 watts per channel into 8 ohms
Total Harmonic Distortion<0.1% at full power
Speaker Load Impedance4 to 16 ohms
TypeSolid State
Input Impedance100kΩ
Damping FactorGreater than 50
Signal to Noise Ratio>90dB

Summary

General Information

Quad 33 Circuit Description

Describes the signal path and components of the Quad 33 unit.

Accessing the Quad 33

Explains how to access components within the Quad 33 unit.

Pushbutton Mechanism Service

Quad 303 Circuit Details

Output Stage Configuration

Explains the triple configuration of the output stage transistors.

Driver Stage Circuitry

Describes the circuitry for limiting the current of Tr102.

Simplified Circuit Overview

Presents a simplified circuit diagram of the Quad 303.

Quad 303 Operational Aspects

Regulator Board Functionality

Explains the function and regulation mechanism of the regulator board.

Unit Setup Procedure

Provides step-by-step instructions for setting up the Quad 303 unit.

Troubleshooting and Fault Finding

Intermittent Connection Faults

Describes intermittent contact issues with plug-in boards and their solution.

Push-Button Switching Logic

Product Modifications

Quad 33 Model Modifications

Details modifications for the Quad 33 based on serial numbers.

Quad 303 Model Modifications

Details modifications for the Quad 303 based on serial numbers.

Component List: Quad 303 Driver Board

Component Lists: Regulator and Disc Boards

Quad 303 Regulator Board Components

Lists components for the Quad 303 Regulator Board M12035, referencing Fig. 12.

Quad 33 Disc Board Components

Lists components for the Quad 33 Disc Board M.12021, referencing Fig. 4.

Quad 303 General Components

Lists general components for the Quad 303, referencing Fig. 10.

Component Lists: Pre-amplifier and Tape Boards

Quad 33 Pre-amplifier Board Components

Lists components for the Quad 33 Pre-amplifier Board M.12019, referencing Fig. 5.

Quad 33 Tape Board Components

Lists components for the Quad 33 Tape Board M.12027, referencing Fig. 6.

Component Lists: Amplifier and Power Supply Boards

Quad 33 Amplifier Board Components

Lists components for the Quad 33 Amplifier Board M.12017, referencing Fig. 7.

Quad 33 Power Supply Board Components

Lists components for the Quad 33 Power Supply Board M.12032, referencing Fig. 9.

Component Lists: Filter and General Boards

Quad 33 Filter Board Components

Lists components for the Quad 33 Filter Board M.12029, referencing Fig. 8.

Quad 33 General Components List

Lists general components for the Quad 33, referencing Fig. 3.

Quad 33 Top View Component Identification

Disc Adaptor Board M.12021 Component Identification

Disc Pre-Amplifier Board M.12019 Identification

Tape Adaptor Board M.12027 Underside Identification

Tape Adaptor Board M.12027 Top Side (Issue 1)

Tape Adaptor Board M.12027 Top Side (Issue 3)

Amplifier Board M.12017 (Issue 2) Identification

Amplifier Board M.12017 (Issue 3) Identification

Filter Board M.12029 Identification

Power Supply Board M.12032 Identification

Quad 303 Underside View Component Identification

Driver Board M.12038 (Issue 9) Component Identification

Driver Board M.12038 (Issue 10) Component Identification

Regulator Board M.12035 Component Identification

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