Bias Switch; Fx - Send & Return - Mesa/Boogie Dual & Triple Rectifier Solo Heads Owner's Manual

RECTIFIER SELECT (Continued)
amps. If you are like most of the players we know, you'll probably end up leaving your RECTIFIER Solo Head, DUAL or
TRIPLE set to the Vacuum 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 both of these amplifiers born vintage performer in any stylistic arena.
NOTE: On the DUAL Solo Head it is possible to run two 6L6 or EL34 tubes by pulling the two center tubes leaving the far left and
far right tubes intact. This procedure reduces the power by approximately 50%. Remove one of the Rectifier tubes if you are using
the Tube Rectifier setting to assure a correct match.
Your DUAL or TRIPLE RECTIFIER Solo Head was designed with versatility in mind. So to add to the

BIAS SWITCH:

already awesome array of on board features...we felt it essential that both of these RECTIFIER Solo Heads 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
BIAS SWITCH
EL-34
6L6
CAUTION
BIAS SETTING
MUST MATCH
TUBES IN USE
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 both the DUAL and TRIPLE RECTIFIER Solo Heads. 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. 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.
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 DUAL or TRIPLE RECTIFIER Solo Head 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 34's.
Make sure that the BIAS Switch is set correctly to match the tube type that you are using.
do this will result in tube failure that could possibly burn resistors in the Bias supply. Although this is a fairly simple repair
for an authorized technician, it is easily avoidable. ALWAYS CHECK THE BIAS SWITCH setting if you experiment with
alternate tube types and you will enjoy uninterrupted performances from your amplifier of choice.
FX LOOP:
FX LOOP - SEND & RETURN:
Loop in both the DUAL and TRIPLE RECTIFIER Solo Heads is wired in parallel with the unaffected or dry signal which enables
SEND LEVEL SEND
MIX LEVEL
RETURN
100% 0%
sound in the Rhythm channel that was previously unavailable in all but the best vintage
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 harmonics that 6L6's reproduce, but not really enhance in the same way the EL 34's do.
These two 1/4" jacks are the patch point for external signal processing effects. The Effects
you to preserve the integrity of the all tube tone and feel that either version of this amplifier is capable of
delivering. To use the Effects Loop for your processors, simply connect the Effects SEND jack to your
first effects' INPUT jack. Connect your last effects' OUTPUT jack to the Effects RETURN jack.
The Effects Loop interrupts the signal between the pre-amp and power section. Therefore, the Return
jack can double as a 'Power Amp Input' jack. Remember that the Loop must be engaged for signal to
pass this junction. You will also want to run the MIX Control at 100% to use the Loop as a Power In patch
point.
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