Mesa/Boogie Mark IV Amplifier Graphic EQ, Output Level, Silent Recording Pull Switch, Standby

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SILENT
RECORDING
(PULL)
SILENT
RECORDING
(PULL)

CONTROLS: (Continued)

GRAPHIC EQ: (Continued)

EQ back out of the circuit, the straight tone sounds to flat. Don’t worry! It’s just “hearing hangover”. All the MARK IV’s modes were developed without using the EQ so that it could be an accessory - not a necessity.

OUTPUT LEVEL:

This control adjusts the playing loudness of all three modes equally. Once you’ve got the sounds set up as you would like them, using this one control will allow you to work louder or softer venues. Notice that the OUTPUT LEVEL control also functions as an Effects Return control, owing to its location in the signal chain.

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SILENT RECORDING: (Pull Switch)

This push/pull switch turns off the signal at the output stage therefore muting the speaker. This enables you to record silently (using the RECORDING out jack, not the SLAVE D.I.) without the need to disconnect the speaker.

SILENT

Signal strength to the recording circuit is still regulated by the OUTPUT LEVEL control, even

RECORDING

(PULL)

though the speaker cannot be heard.

 

 

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NOTE: Remember...a load must be maintained on the amplifier to avoid damage to the transformer. A soak resistor (8 ohms) can be purchased for just such purposes. See your local dealer or give us a call and we’ll assist you if need be.

STANDBY:

The STANDBY switch turns off the high voltages inside the amplifier while allowing the tube filaments to stay warm and ready for immediate use. It’s a good practice to turn on the A.C. power with this switch in the

EQSTANDBY position, allowing the tubes 30 seconds or so to warm up. This procedure

ON

prevents tube problems and increases their toneful life substantially.

 

 

 

 

 

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The STANDBY switch is also the perfect feature for set breaks as well.

 

 

 

 

 

 

 

 

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OUTPUT LEVEL STANDBY

NOTE: Remember...remove the protective plastic coating from the tubes before you

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MARK IV

 

 

connect the MARK IV to an A.C. outlet.

 

 

 

 

 

 

 

POWER: (Full & Tweed Power)

This switch has three positions: FULL POWER, OFF and TWEED POWER. The OFF position is in the center and is unlabeled. Use FULL POWER for maximum volume and clean headroom. TWEED POWER works like a built-in variac, reducing all the internal

voltages for a spongy, vintage feeling and an extraordinary “brown sound”.

SILENT EQ LOOP

RECORDING

 

(PULL)

ON

FULL

POWER is reduced somewhat too, making it easier to achieve a big overdriven power sound, espe-

 

 

 

 

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POWER

cially when TWEED POWER is used in conjunction with Class A power (this will be explained later in

 

 

 

 

 

 

 

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this manual). Another virtue of TWEED POWER is that the lowered voltages will greatly extend tube

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life and overall reliability, while still producing enough power to work many of your gigs...and all of your

 

 

 

TWEED

 

 

 

 

 

 

OUTPUT LEVEL STANDBY

POWER

recording sessions!

 

 

MARK IV

 

 

 

 

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Contents Mark Hello from the Tone Farm Mark IV Table of Contents USE Common Sense and Always Observe These Precautions Markk Front Panel Rhythm 1 Gain Pull BrightRhythm 1 Treble R1 + R2 Bass & R1 + R2 MIDR1 Presence R1 MasterRhythm 2 Gain & FAT Setting the Lead Mode Lead Gain Rhythm 2 Treble R2 Presence R2 MasterLead Gain Lead TrebleLead Bass & Lead MID Lead DriveLead Bright Lead Presence & Lead MasterGraphic EQ Silent Recording Pull Switch Graphic EQOutput Level StandbyReceptacle Internal circuitryFuse Reverb & Reverb Footswitch EQ Rocker SwitchSatellite Control EQ & Send Jack Due to cable length or impedance mismatchingRecording OUT when feeding a p.a. board Triode / Pentode SwitchEffects Loop Section Recording OUTSIMUL-CLASS / Class a Switch Harmonics / MID Gain SwitchPower Tube Substitution Power Tube Substitution Speaker JacksSide while pulling gently downward External Switching Jacks Going StereoMark 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