Mesa/Boogie Mark Five Owner's Manual download pdf (Page 28)

POWER

This toggle switch delivers the A.C. power to the MARK FIVE: 25. Make sure the ampliﬁer is grounded (all three terminals

of the A.C. power cord connected) to avoid injury to the user as well as to the ampliﬁer. Also make sure the proper voltage (117–125

Volts AC Domestic US Model) is present at the wall socket.

Always follow the Cold Start Procedure described in the STANDBY section when powering up your ampliﬁer. This will

reduce the likelihood of tube problems and increase their musical life.

STANDBY

Perfect for set breaks...this toggle switch also serves an even more important purpose. From Cold-Start, the STANDBY

position allows you to warm up the tubes—especially power tubes— before applying the high voltage to them by switching the Standby

to the “ON” position. Before POWER is switched to “ON” - make sure the STANDBY switch is set in the “STANDBY” position.

Cold-Start Procedure:

Flip the POWER SWITCH to ON, then wait at least 30 seconds for the tube ﬁlaments to warm up and then ﬂip the STANDBY switch to

the ON position. This prevents the shock of high voltage hitting cold tubes and reduces the likelihood of tube problems and increases

their toneful life substantially.

NOTE: This Cold Start Procedure is an important part of ensuring maximum tube life and reliability. Like a light bulb, the most wear

occurs in the instant (short period, ﬁrst few seconds) voltage is ﬁrst applied. Like a light bulb, if a dimmer is used to reduce the volt-

age for the ﬁrst few seconds or so of use, increased longevity is the result. The STANDBY is the amp’s equivalent to a dimmer and

using it in the above described method will ensure the longest life and best performance from a set of tubes (especially Output tubes).

That covers the Inputs, Channels, Modes and Controls found on the Front Panel of the MARK FIVE: 25, now let’s swing around to the

Rear Panel and take a look at the Outputs, Features and Controls located there.

PAGE 24

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 28

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