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Mesa/Boogie Mark IV Amplifier manual Power Tube Substitution

Models: Mark IV Amplifier

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Power Tube Substitution:

6V6's in Tweed & Simul-Class in all 4 sockets.

5881's in all 4 or Class A Sockets.

EL-34's in Class A sockets only.

Description of Tube Functions

V1A= Input Stage	V3A= First Lead High Gain Stage
V1B= Tone Recovery Stage	V3B= Reverb Return
(post tone controls)	V4A= Second Lead
V2A= Third Gain Stage (Rhythm Modes)	High Gain Stage
and Fifth Lead Gain Stage	V4B= Reverb Send
V2B= FX Return Stage	V5= Phase Inverter

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Mesa/Boogie Mark IV Amplifier manual Power Tube Substitution

Contents

Mark Hello from the Tone Farm Mark IV Table of Contents USE Common Sense and Always Observe These Precautions Markk Front Panel Pull Bright Rhythm 1 GainRhythm 1 Treble R1 + R2 Bass & R1 + R2 MIDR1 Presence R1 MasterRhythm 2 Gain & FAT Rhythm 2 Treble Setting the Lead Mode Lead GainR2 Presence R2 MasterLead Treble Lead GainLead Bass & Lead MID Lead DriveLead Bright Lead Presence & Lead MasterGraphic EQ Graphic EQ Silent Recording Pull SwitchOutput Level StandbyReceptacle Internal circuitryFuse EQ Rocker Switch Reverb & Reverb FootswitchSatellite Control EQ & Send Jack Due to cable length or impedance mismatchingTriode / Pentode Switch Recording OUT when feeding a p.a. boardEffects Loop Section Recording OUTSIMUL-CLASS / Class a Switch Harmonics / MID Gain SwitchPower Tube Substitution Power Tube Substitution Speaker JacksSide while pulling gently downward Going Stereo External Switching JacksMark Mark IV Personal Settings Power Tube Substitution Diagnosing Power Tube Failures Tube Noise & MicrophonicsTube Noise Diagnosing PRE-AMP Tube Problems Here’s a question we often hear Bias Adjustment Cheers Randall Smith Designer & President Front View Mark Mesa Boogie 707 778-6565 FAX no