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Acoustic 135 - User Manual

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Acoustic 150, 134 & 135 Service Manual
(note: 150B, 136 and 140 are similar;
those models used two 17-10 preamp boards
instead of one 17-10 and one 17-11)
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Summary

Acoustic 150, 134 & 135 Service Manual

150 Series Amplifier Line

Model Overview and Features

Describes models 151-155 and their differences.

Modular Construction Benefits

Highlights ease of repair.

General Specifications

Lists key technical parameters for the series.

Model 134, 135, 136 Specifications

Model 134 Guitar Amp Details

Features, dimensions, and weight.

Model 135 Guitar Amp Details

Features, dimensions, and weight.

Model 136 Bass Amp Details

Features, dimensions, and weight.

Model 154, 155, 146, 149 Specifications

Model 154 Guitar Amp Details

Features, dimensions, and weight.

Model 155 Guitar Amp Details

Features, dimensions, and weight.

Model 146 & 149 Bass Amp Details

Features, dimensions, and weight.

General Information

Amplifier Description

Overview of the combined amplifier and speaker enclosure.

Model 154, 155, 156, 134, 135 Specifications

Specific technical data for these models.

Theory of Operation

17-10 Preamp Board Circuit

Explanation of the first preamp stage.

17-11 Preamp Board Circuit

Explanation of the reverb/tremolo preamp.

17-12 Power Amp Board Circuit

Explanation of the power amplifier stage.

General Troubleshooting

Required Test Equipment

Tools needed for diagnostics.

Preliminary Diagnostic Checks

Initial steps before detailed testing.

Detailed Testing and Voltage Tables

Specific test procedures and expected voltage readings.

General Troubleshooting (Continued)

17-11 Circuit Card Test Procedures

Testing specific circuit cards.

Theory of Operation (Continued)

Tremolo Oscillator and Driver Waveforms

Signal analysis of the tremolo section.

D.C. Voltage Measurements

DC readings for troubleshooting.

17-10 Preamp DC Voltage Checks

DC voltages for the 17-10 board.

17-11 Preamp DC Voltage Checks

DC voltages for the 17-11 board.

Theory of Operation (Continued)

Power Module (17-12) Testing

Testing the power amplifier module.

Power Output and Bandwidth

Measuring amplifier output performance.

Power Amplifier DC Bias Levels

DC measurements for power transistors.

Control Locations

Front Panel Control Identification

Lists and describes front panel controls.

Rear Panel and Connector Identification

Identifies rear panel connections.

Troubleshooting Chart

Amplifier Fuse and Distortion Issues

Solutions for blown fuses and low-volume distortion.

Reverb and Oscillation Problems

Troubleshooting reverb and feedback issues.

Noise, Hum, and Output Failures

Diagnosing buzzing, hum, and no output.

Parts List - Model 150

Electronic Components and Boards

Lists capacitors, resistors, transistors, and PC boards.

Connectors and Hardware

Lists jacks, plugs, sockets, and lugs.

Mechanical Parts and Fasteners

Lists cabinet parts, corners, screws, and glides.

Resistor Values

Comprehensive list of resistors.

Parts List - Model 150 (Continued)

Capacitor Values and Semiconductors

Lists capacitor values, transistors, and ICs.

Specifications

General Amplifier Specifications

Covers models 134, 135, 150.

Model 154 & 152 Speaker Cabinet Specs

Details for speaker cabinets.

Model 155 & 134 Speaker Cabinet Specs

Details for speaker cabinets.

Model 135 Speaker Cabinet Specs

Details for speaker cabinets.

Acoustic 135 Specifications

General IconGeneral
BrandAcoustic
Model135
CategoryMusical Instrument Amplifier
LanguageEnglish

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