Mesa/Boogie Mark Five Owner's Manual download pdf (Page 29)

REAR PANEL

MAIN FUSE

This is the A.C. (Alternating Current) Main Fuse and it provides ampliﬁer circuit protection from possible power tube

failures as well as from A.C. voltage ﬂuctuations. ALWAYS replace a blown fuse with one of the speciﬁc rating and type as (conveniently)

printed on the back of your ampliﬁer right next to the fuse holder. NEVER INSTALL A FUSE OF A HIGHER RATING than the value

printed on the back of your ampliﬁer. Doing so will very likely produce damage well beyond the original reason your fuse blew in the

ﬁrst place. Domestic USA Models of the MARK FIVE: 25 use a 1.25 Amp SLO-BLO type Fuse.

A power tube short or failure is often the cause of a blown fuse. Position yourself behind the ampliﬁer and follow the Cold Start Pro-

cedure described in the STANDBY switch section of this Operating Guide. Watch the power tubes as you ﬂip the STANDBY to the ON

position. If a power tube is going bad or is arcing you will often see it ﬂash as you ﬂip the STANDBY and power up! Flip the STANDBY

switch to “STANDBY” immediately and replace the faulty power tube (and the fuse as necessary).

If you see nothing abnormal as you move the STANDBY switch to ON, it is possible that a power tube shorted ‘temporarily’ and caused

the blown Fuse. Occasionally, whether from just luck or from cooling down, a short in a power tube ‘reconnects’ itself temporarily

and can operate normally again for a time… but this tube should be considered faulty and replaced as soon as possible to ensure

uninterrupted performance. If you can identify a tube that is arcing or shorting by the method mentioned above and the tubes have

minimal use, consider replacing the obviously faulty or failed tube and leaving the others installed.

If you haven’t changed tubes for a while after heavier use, a failure may be telling you it’s time to change all your power tubes. Save

any working but used tubes as spares.

Spare fuses (of the proper type and rating) are a must for the fabled cord bag along with at least one set of spare tubes. Always have

both on hand—at the gig or at home—since tubes decide, not you, when it’s time to stop working. Spare tubes and fuses can be

worth their weight in gold should you ever experience a tube failure, especially on a gig. We STRONGLY recommend making them a

permanent ﬁxture in your gig bag.

AC MAINS SOCKET (QUICK DISCONNECT STYLE)

This is the AC MAINS Power Cord Socket. The standardized remov-

able power cable supplied with your amp can only be plugged in one way. Always connect the male end to a grounded (3-Hole) wall

socket with the proper voltage present (117 Volts on U.S.A. Models). To Avoid The Risk Of Shock, Never Alter The Power Cable in any

way. Altering the Power Cable will void your warranty and put you at risk while leaving your ampliﬁer open to the possibility of damage.

FX (LOOP – SERIES)

The MARK FIVE: 25 beneﬁts from 40 years of high performance amp design and the FX Loop featured

here is a result of that experience and expertise. The FX Loop is wired in Series with the dry signal and as long as you are using

processors of good quality, you should experience seamless interfacing with no tonal degradation. That said, anything

you insert in this extremely sensitive junction of an ampliﬁer (between preamp and power section) may have the po-

tential to slightly alter the sound.

Also, every company that builds processors has their own way of doing things and there are circuits, controls and features

that empower, and some that make things more complicated while adding questionable sonic beneﬁt. We suggest taking

your amp and trying it with the processor you are considering to make sure you will have great performance when they are coupled.

PAGE 25

CLEAN

CRUNCH

MK IIC+

XTREME

GAIN TREBLE

MID BOOST

MID PRESENCE MASTERBASS

EQ ON

EQ FS

SPKR

CLOSED

BACK

OPEN

BACK

CabClone™

D.I.

SPKR

OFF

LIFT

GROUND

EQ ON

EQ FS

CAUTION: Unplug

power before

servicing

120 V~

60 Hz

1 A

1.25 A

SLO

BLO

AMPLIFIER

44YV

HEADPHONE

RETURNSEND

4 OHM 8 OHM

4 OHM

REVERB

CH 2 CH 1

MARK FIVE: 25™

VACUUM TUBE

AMPLIFIER

HANDCRAFTED

IN PETALUMA,

CALIFORNIA

80Hz 240 750 2200 6600

25 W

10 W

25 W

10 W

TUBE GUIDE

6 x 12AX7

2 x EL 84

PATENTED

7,602,927

(USE WITH TWO 8 OHM SPKRS)

SPEAKERS

INPUT

FT SW

POWER

STANDBY

MARK

TWENTY-FIVE

™

CLEAN

CRUNCH

MK IIC+

XTREME

GAIN TREBLE

MID BOOST

MID PRESENCE MASTERBASS

EQ ON

EQ FS

SPKR

CLOSED

BACK

OPEN

BACK

CabClone™

D.I.

SPKR

OFF

LIFT

GROUND

EQ ON

EQ FS

CAUTION: Unplug

power before

servicing

120 V~

60 Hz

1 A

1.25 A

SLO

BLO

AMPLIFIER

44YV

HEADPHONERETURNSEND

4 OHM 8 OHM

4 OHM

REVERB

CH 2 CH 1

MARK FIVE: 25™

VACUUM TUBE

AMPLIFIER

HANDCRAFTED

IN PETALUMA,

CALIFORNIA

80Hz 240 750 2200 6600

25 W

10 W

25 W

10 W

TUBE GUIDE

6 x 12AX7

2 x EL 84

PATENTED

7,602,927

(USE WITH TWO 8 OHM SPKRS)

SPEAKERS

INPUT

FT SW

POWER

STANDBY

MARK

TWENTY-FIVE

™

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Mesa/Boogie Mark Five Owner's Manual Page 29

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