Mesa/Boogie Mark IV Amplifier manual Receptacle, Internal circuitry, Fuse

Models: Mark IV Amplifier

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REST AREA

REAR PANEL MKIV

FUSE

3A SB

117VOLTS 60 HZ

4 AMPS

 

 

 

 

 

 

 

REV FTSW.

FX LOOP ON

 

 

 

 

 

 

 

 

FULL TIME

REVERB

1

0

10

 

 

 

2

 

 

 

 

 

 

 

 

9

 

 

 

 

3

 

 

 

8

 

 

 

 

4

 

 

7

 

 

 

 

5

6

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

FX LOOP

GRAPHICEQ

 

 

 

 

 

SATELLITE

 

SWITCHING

 

 

 

 

 

SIG.

LEFT

 

 

 

 

 

 

 

SATELLITE EQ

(STEREO)

ON OFFAUTO R2

 

PATH

 

 

 

 

 

REMOTE

SATELLITE SEND

RETURN

AUTO

 

 

AUTO

RHY 1

 

RHY 2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

RHY 2

 

 

LEAD

AUTO ASSIGN SWITCHES

RIGHT

(MONO)

FX SEND

RETURN

RECORDING

(D.I.) SLAVE

 

 

 

 

 

TRIODE

SIMUL-CLASS

HARMONICS

1

0

10

AMP

 

VOICING

POWER

 

5

 

 

LEAD

6

7

9

 

2

 

 

 

 

 

 

3

 

 

 

8

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

PENTODE

CLASS A

MID GAIN

LEVEL

 

OUT

 

 

4

0

 

 

8

SPEAKERS

 

 

1

10

 

 

 

2

 

 

 

9

 

 

 

3

 

 

7

 

 

 

 

5

6

 

8 OHM

4 OHM

4 OHM

 

 

 

 

 

 

 

 

RHY 2

RHY 1

LEAD

FT SW

EX SW

MODE SELECT

HANDBUILT IN PETALUMA CALIFORNIA

CLASS A/ SIMUL FX LOOP

EQ

EXTERNAL SWITCHING JACKS

RHYTHM 1 RHYTHM 2

LEAD

A.C. RECEPTACLE:

The MARK IV uses a removable I.E.C. type power cord to supply the A.C. power. The power cord supplied with your unit should be used whenever possible as we chose it for its snug fit. Because this type of RECEPTACLE is somewhat universal and used in many products both in and out of electronic musical instrument domain, you may use other cords of this

 

type when the one supplied is not available. Should this become necessary, check that the cord is seated all

FUSE

the way into the RECEPTACLE to insure an uninterrupted performance. In the U.S., the proper voltage is

3A SB

117 volts A.C. (110-120). Always be sure to connect the MARK IV to its rated voltage to avoid damaging

 

internal circuitry.

117VOLTS 60 HZ

4 AMPS

FUSE:

The FUSE should be a 3 amp Slo-Blo for use with 100 or 117 volt A.C. Mains. Should the FUSE blow, replace it with a similar type and rating, then watch the power tubes as you start the amp back up again.

 

Warm up the tubes first with the amplifier in STANDBY mode, then, watching them carefully, flip the STANDBY

FUSE

switch to ON. If you see a tube arc or spark inside, that is definitely the problem and can be remedied by an

3A SB

easy power tube replacement. In many cases though, the bad tube will only fail intermittently. Watch for a

 

while and if any tubes start to run red-hot, this is the cause of your original problem.

117VOLTS 60 HZ

4 AMPS

If everything appears OK, tap on each power tube to reveal the faulty one, because a blown fuse is nearly always caused by a bad power tube (s). Running the amp in TWEED power will very likely offer a temporary remedy and let you get through the gig. If the FUSE blows immediately when switching on the A.C. power (in

the STANDBY mode), then some other problem is the cause, most likely a failed rectifier diode. (See the section on tube maintenance further back in this manual for more assistance and helpful hints on how to maintain the life of the power tubes).

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Mesa/Boogie Mark IV Amplifier manual Receptacle, Internal circuitry, Fuse

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.