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PAGE 7
REAR PANEL (Continued)
DRIVER TUBES: 3 x 12AX7A
to grab hold of the particular pre-amp tube when replacement is required. Do not allow
your fingers, hands or rings/jewelry to come into contact with any other part (s) of the amplifier’s internal circuitry.
No other user serviceable parts exist in side. Refer service to qualified personnel. Always unplug AC power before removing the
top cover of the amplifier.
AC RECEPTACLE:
The total power consumption for the
2:100
is 6Amps @ 120 Volts. Thus, a 15 Amp circuit (which is what
most house circuitry is wired with) is adequate. Make sure the Euro style A.C. power cord is firmly seated in the power receptacle
before powering up the unit. Always connect the A.C. cord to a 3 terminal grounded socket. If none are available,
connect the A.C. power cord to a ground lift adaptor and then connect to a 2 terminal outlet. This may also be
necessary from time to time for noise problems.
This style of power cord will make tear-downs and cable routing a lot easier and save you time as well. If you
should ever need a replacement, just call and we’ll be happy to send you another one for a nominal charge or visit
your nearest
MESA/Boogie
Pro Center.
LINE FUSE:
This is the
2:100’s
A.C.’s ( Alternating Current ) main fuse and provides protection from outside A.C. fluctuations,
as well as power tube failure damage. Should the FUSE blow, replace it with the same rating in a slo-blo type package. The domestic
U.S. version requires a 6 Amp SLO-BLO FUSE. A power tube short or failure is often the cause of a blown fuse...Follow the cold
start procedure mentioned earlier in the ON / STANDBY switch section and 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 see it!
Flip the STANDBY switch to STANDBY immediately and replace the faulty power tube and the
FUSE if necessary. If you see nothing abnormal as you lift the STANDBY switch, it is possible that a
power tube shorted temporarily and blew the FUSE. If this is the case it may work again normally.
To be extra safe you may want to replace all power tubes in the troubleshooting tradition and save
the replaced set as spares. Carry along a few extra fuses for they too could be worth their weight in
gold someday.
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