Rectifier Select; Ground; Bias Switch - Mesa/Boogie Dual Rectifier Trem-o-Verb Owner's Manual

RECTIFIER SELECT: This patented switchable feature allows you to select between two different types of rectifiers for different
sounds and feel. It first appeared on our Dual Rectifier Solo Head and is, in fact, part of the magic behind the whole Dual Rectifier
series of amplifiers. It has since found its way into some of our other products as well, such as the MAVERICK, HEART-

GROUND

B OFF A

RECTIFIER SELECT

VACUUM SILICON
TUBES DIODES
(NORMAL) (HI POWER)
SPONGY
The Vacuum Tube (NORMAL) position takes a power section walk down memory lane, paying tribute to those vintage gems of
yesteryear. In those early days of amplification, the only rectifiers available were tubes. Unbeknownst to their creators, these sweet
sounding amplifiers would someday become relics as the demand for higher volumes and more power per package led to the
abandonment of the tube rectifier in favor of the five cent silicone diode's greater efficiency. With this decision went much of the
sweetness and soul, and by the mid 70's, many amps were bold, loud, and efficient, and unfortunately...sometimes lacking some of
that earlier soul.
We wanted the Dual Rectifier series to capture that... "thing" that you... "can't quite put your finger on...but you know it wh en it's got it."
Soul, Personality and Feel. The VACUMM TUBE position gives you a sweetness of sound and a liquid feel that simply cannot be
duplicated in any other way. This position shines for single note lead work in either channel and delivers a warm, breathing c lean
sound in the Rhythm channel that was previously unavailable in all but the best vintage amps. If you are like most of the players we
know, you'll probably end up leaving your TREMO set to the VACUMM TUBE position all the time. Regardless of your preference
the RECTIFIER SELECT gives you options that you won't find anywhere else and versatility that makes the TREMO a born vintage
performer in any stylistic arena.
GROUND: This switch reverses the polarity of the A.C.GROUND. It can be helpful in eliminating annoying hum or A.C. buzz as well
well as those painful microphone shocks. It should be left in the center "OFF" position when neither of these
GROUND
problems are occurring.
B OFF A
BIAS SWITCH: Your TREM-O-VERB was designed with versatility in mind. So to add to the already awesome array of on board
features...we felt it essential that the TREMO be able to adapt its power output section 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 EL 34 sound know that
nothing has the lushness of harmonics or spread like a power amp using EL34's. In truth, EL 34's do focus in on a region of upper

BIAS SWITCH

EL-34
6L6
CAUTION
BIAS SETTING
MUST MATCH
TUBES IN USE
BEST TO USE TUBE RECTIFIER WITH EL-34
to both a warm clean sound and huge, tight high gain crunch sound.
We recommend the 6L6 for reliability: In our many tests and continued use of the currently available EL 34 type power tubes on
the market today, we regret to say that they do not appear to be as rugged in construction as the available 6L6. This is another reason
why your TREM-O-VERB was shipped with 6L6 power tubes. If you plan to use the EL 34's we suggest that you keep a full set of
tubes and extra fuses with you during all performances in the event of a tube failure occurring when using the currently available EL
BREAKER and the BLUE ANGEL. Voodoo and versatility have been added to these
products by the inclusion of this cool, patented feature.
4A SB
FUSE
Solid State (HI POWER) calls up the silicone diode rectifiers offering more punch, a tighter
2A
POWER
attack with added brightness and substantially more headroom. This would be the preferred
position for loud clean playing or tight rhythmic playing with a high front end Volume setting
BOLD
(HIGH GAIN.)
harmonics that 6L6's reproduce, but not really enhance in the same way the EL 34'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 EL 34 clip to the 6L6's that come standard in the TREMO. If you
need a variety of sounds and rely on a clean chording sound much of the time, you will likely prefer
the TREMO'S stock compliment of 6L6's. 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
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