Mesa/Boogie Rectifier Stereo - Manual (Page 8)

INPUTS: Located on the Rear Panel, these two 1/4” jacks are the Channel A and Channel B inputs for the 2:100. These are the
inputs for pre-amps and/or effects, depending on how you have your system wired. You may drive the 2:100 with your pre-amp
directly or choose to come from the last effect in a chain and drive the power amp this way. Either way is fine and up to your
preference. The amplifier is stereo, offering two separate channels of
amplification. If you wish to use only one of its channels, it is neces-
sary to: 1 ) Make sure a speaker (or load resistor) remains con-
nected to a speaker jack on both channels, including the unused
one; or 2 ) Turn the LEVEL Control of the unused channel to zero.
(This is necessary because an amplifier channel receiving any amount
of signal at its input will require a “load” at its output - or damage will
most likely result.)
The RECTO INPUTS are wired such that when the companion Rec-
tifier Recording Preamp is used, the circuit remains exactly true to
the signal path between preamp and power section as it occurs in the Dual and Triple Rectifier Heads. To achieve this duplication,
a driver tube responsible for the effects return stage and all related circuitry in the 2:100 must be removed and this includes the
LEVEL Conbtrols as they are part of this circuitry. As a result, when using the RECTO INPUTS, you will use the Recto Pre LIVE
OUTPUT Control as your overall final master level control.
TUBE BIAS: Your 2:100 was designed with versatility in mind. The BIAS SWITCH allows you to adapt the power output section
of the 2:100 in order to use the other classic pentode power tubes, the British style EL 34. These tubes are largely responsible for the
signature sound of many immediately identifiable and wonderful sounding amps created in Great Britain
and used on some of the best recordings to date. The nature of their sound is usually brighter in the
extremely high frequencies...some players find this almost thin at first. However, aficionados of the EL34
sound know that nothing has the lushness of harmonics or spread like a power amp using EL34’s. In
truth EL34’s do focus in on a region of upper harmonics that 6L6’s reproduce, but not really enhance, in
the same way the EL34’s do.
This characteristic is sometimes preferred for sounds that range from a soft clip that would be used for
chording or soloing, to an all out high gain crunch or lead sound. Players that use mostly these types of sounds may prefer the EL34
clip to the 6L6’s that come standard in the
2:100. If you need a variety of sounds and rely on a clean chording sound much of the time,
you will likely prefer the stock compliment of 6L6’s that the 2:100 comes fitted with. We feel the 6L6 is a more balanced sounding
tube that produces plenty of harmonic lushness, while at the same time delivering the rich lows that are crucial to both a warm clean
sound and huge, tight high gain crunch sound.
PAGE 4
E N G I N E E R I N G
WARNING : To reduce risk of fire or electric shock, replace fuse with
same type and rating only. Do not expose this unit to rain or moisture.
WARNING : To reduce risk of fire or electric shock, Do not remove cover. No user-
serviceable parts inside. Refer servicing to qualified personnel.
GROUND
SWITCH
LIFT
GROUND
BIAS
SWITCH
6L6
EL34
POWER FUSE
6 A
SLO
BLO 120 V~
60 Hz
6 A
I
N
P
U
T
S
I
N
P
U
T
S
NORMAL NORMAL
RECTO INPUTS RECTO INPUTS MUST MATCH TUBES SEE OWNERS MANUAL
MODERN
REAR PANEL FEATURES:
REAR VIEW: 2:100
FU SE
F US E
4 OHM
8 OHM
WARNING : To reduce risk of fire or electric shock, replace fuse with same type and rating only. Do not expose this unit to rain or moisture.
WARNING : To reduce risk of fire or electric shock, Do not remove cover. No user- serviceable parts inside. Refer servicing to qualified personnel. E N G I N E E R I N G
MUST MATCH TUBES SEE OWNERS BOOK
CHAN. B CHAN. A
8 OHM
4 OHM
SPEAKERS SPEAKERS
MODERN
RECTO INPUTS RECTO INPUTS
GROUND
SWITCH
LIFT
GROUND
BIAS
SWITCH
6L6
EL34
POWER FUSE
6 A
SLO
BLO 120 V~
60 Hz
6 A
I
N
P
U
T
S
I
N
P
U
T
S
NORMAL NORMAL
E N G I N E
WARNING : To reduce risk of fire or
electric shock, replace fuse with same type and rating only. Do not expose this unit to rain or moisture.
BIAS
SWITCH
6L6
EL34
POWER
120 V~
60 Hz
6 A
I
N
P
U
T
S
NORMAL
RECTO INPUT MUST MATCH TUBES