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

Page 12
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.

4

5

6

7

3

2

 

1

0

8

9

10

 

80 240 750 2200 6600 OUTPUT LEVEL

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.

 

 

6

5

4

7

 

3

 

 

 

 

2

 

 

 

8

 

1

 

 

 

 

9

10

0

 

 

 

 

 

 

80

240 750 2200 6600

OUTPUT LEVEL

 

 

 

 

 

 

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.

 

 

 

 

 

2

1

0

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

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

 

 

 

 

 

 

 

 

9

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

3

 

 

 

 

 

 

 

 

 

 

 

 

 

5

6

7

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

OUTPUT LEVEL STANDBY

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

80

240

750

2200

6600

 

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-

 

 

 

 

2

1

0

10

 

POWER

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

 

 

 

 

 

 

 

9

 

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

3

 

 

 

 

 

 

 

 

8

 

4

 

 

7

 

 

5

6

 

 

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

 

 

 

 

PAGE 8

 

 

 

 

 

 

 

Page 11 Page 13
Image 12
Page 11 Page 13
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 TrebleR2 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

Mark IV Amplifier specifications

The Mesa/Boogie Mark IV amplifier stands as a landmark in the world of guitar amplification, boasting a rich history that intertwines with the evolution of rock music. Launched in the 1990s, the Mark IV embodies the hallmark traits of Mesa/Boogie’s innovative spirit, delivering versatility, power, and an extensive range of tonal options.

At the core of the Mark IV is its three-channel configuration, which includes Clean, Rhythm, and Lead channels. Each channel offers varying degrees of distortion and gain that can be tailored to the player's distinct preferences. The Clean channel produces a pristine sound, ideal for jazz or blues, while the Rhythm channel steps up with a compelling crunch for rock tones. The Lead channel takes it further, providing a high-gain saturation, perfect for heavier genres. The ability to switch seamlessly between these channels enables musicians to transition effortlessly during performances.

One notable feature of the Mark IV is the onboard graphic equalizer. This 5-band EQ allows guitarists to sculpt their sound intricately, enhancing or attenuating frequencies to achieve a desired tone. Coupled with its patent-pending Gain structure, the amp provides an unparalleled range of tonal shaping ability, making it a favorite among professionals and hobbyists alike.

The Mark IV also benefits from the innovative Dyna-Watt technology. This feature ensures that players can harness full power from the amp, regardless of volume levels. Dyna-Watt adjusts the output stage to produce dynamic responsiveness, allowing for a richness of sound that stands out without needing excessive volume. This feature is particularly useful for studio recording and smaller venues, where loud amplification can be an issue.

Mesa/Boogie amplifiers are renowned for their build quality, and the Mark IV is no exception. Crafted with precision, it features a rugged chassis and high-quality components designed to withstand the rigors of touring. The amp’s tube-driven design, utilizing powerful 6L6 or EL34 tubes, contributes to its warm tone and dynamic response, appealing to a wide array of musicians.

In conclusion, the Mesa/Boogie Mark IV amplifier is a cornerstone piece of gear for guitarists seeking a powerful, versatile, and richly infused tonal experience. With its three-channel architecture, graphic equalizer, Dyna-Watt technology, and robust construction, it meets and exceeds the demands of contemporary musicians across genres. Whether on stage or in the studio, the Mark IV remains a potent tool for expression, earning its place in the pantheon of iconic amplifiers.
Top Page Image Contents