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Bose 4401 Service Manual

Bose 4401
10 pages
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Bose 4401 Specifications

General IconGeneral
BrandBose
Model4401
CategoryAmplifier
LanguageEnglish

Summary

SPECIFICATIONS

GENERAL

Details general operational features and controls of the preamplifier.

ELECTRONIC

Lists detailed electronic specifications including input sensitivity, output, impedance, and filters.

MECHANICAL

Provides physical dimensions and weight of the preamplifier unit.

DISASSEMBLY PROCEDURE

Phono Board Removal

Steps to safely remove the phono circuit board.

Accessing Internal Boards

Procedures for accessing top, lower, and decoder boards.

Board Foil Access and Disassembly

Comprehensive guide for accessing circuit board foil sides.

PARTS LIST

PHONO PREAMP SCHEMATIC

Phono Input/Output Jacks

Details the various input and output jacks for the phono stage.

Capacitance and Source Switching

Explains S1/S2 capacitance selection and S3 source switching.

SQ Decoder Plug-In Interface

Shows the connector pinout for the optional SQ decoder module.

FILTER AND TONE CONTROL CIRCUITS

Low and High Filter Sections

Details the circuitry for the low and high filter controls (S5, S6).

Bass and Treble Tone Controls

Explains the schematic for the bass and treble tone adjustment circuitry.

CONTROL SWITCHES AND CONNECTIONS

Tone, Tape Monitor, and EQ Bypass Switches

Describes functions of S9, S10, and S14 switches.

Loudness, Volume, and Muting Controls

Details S12 loudness, R1 volume, and S13 muting operations.

External Equalizer and Balance Connections

Wiring for external equalizer connections and balance controls.

HEADPHONE AND OUTPUT CIRCUITS

Headphone Jack Interface

Details the wiring and function of the front and rear headphone jacks.

Main Preamp Output Stages

Describes the output amplifier circuits for the main audio channels.

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