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Mesa/Boogie Mark IIA

Mesa/Boogie Mark IIA
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Mesa/Boogie Mark IIA Specifications

General IconGeneral
Power Output60 Watts
Effects LoopYes
TypeTube Guitar Amplifier
Tubes6L6
Channels2
ControlsGain, Treble, Middle, Bass, Master, Presence
Speaker1x12"
Weight45 lbs
Preamp Tubes5x 12AX7
Power Tubes6L6
ReverbYes
FootswitchYes
EQ3-band (Treble, Middle, Bass)
RectifierTube Rectifier

Summary

Operating Manual Introduction

Initial Setup and Basic Rhythm Settings

Guide to plugging in, turning on, and setting initial controls for rhythm mode.

Amplifier Controls and Features

Lead Mode Controls and Operation

Explanation of Lead Drive, Lead Master, and their interaction with Volume 1.

External Connections and Effects Loop

Details on Slave Level, Pre Amp Out, Pwr Amp In, and Effects Send/Headphone jacks.

Speaker Connections and Options

Guidance on connecting speakers and impedance matching for optimal sound.

Advanced Features and Configuration

Fetron Device and Tube Socket Switching

Information on the Fetron device, its placement, and the associated toggle switch.

Optional Footswitch and Cooling Fan

Details on the dual footswitch functionality and cooling fan operation.

Maintenance and Repair Guide

Checkout Procedures and Basic Checks

Steps to verify proper operation and initial settings before troubleshooting.

Troubleshooting Dead, Weak, Noisy, or Bad Tone

Initial steps for diagnosing common amplifier malfunctions.

Pre-Amp and Power Tube Troubleshooting

Guidance on identifying and resolving issues related to vacuum tubes.

Internal Repair: Chassis Servicing

Procedures for checking bias, filter caps, diodes, and output transformer.

Advanced Troubleshooting and Noise Issues

Addressing specific problems like gain fades, pops, buzzes, and oscillations.

Specific Noise Troubleshooting

Detailed steps for diagnosing and fixing buzzing or loud hum issues.

General Repair Techniques and Support

Various repair methods, cleaning, and contact information for assistance.

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