IntroductionAVT150X & AVT150HX Front Panel Features
What is AVT?I. The Preamp Section8. Bright Switch
Advanced Valvestate Technology, or AVT for short, is a major step forward in hybrid amplifier designYour AVT amp boasts no fewer than fourMost of the Gain controls in classic Marshall
which is exclusive to our Advanced Valvestate Series of amplifiers. It has evolved from the original,channels: Acoustic Simulator, Clean, Overdriveamps have been fitted with what is known as a
critically acclaimed Marshall Valvestate technology, but is improved so that it emulates even more1 and Overdrive 2. The preamp section is where�treble bleed capacitorO. This device allows extra
closely the feel and response of the classic Marshall all-valve power stage...without using valves.the gain, tone and relative volume of these fourhigh frequencies to be �bledO through to the driveENGLISH
channels is determined.section when the Gain control is at low settings.
It is not only the power stage that has been significantly improved in the series either. Much carefulEngaging the Bright Switch will �bleedO extra high
attention to detail and many hours of development have also gone into the preamp section too. As a1. Input Jack Socketfrequencies into the drive stage of the Clean
result, each AVT channel offers the widest possible range of control and shape to your sound, with anThis is where you plug your guitar into the amp.channel, giving you a bright, clean tone perfect
a.k.a.12AX7You must always use a screened (shielded)for many styles, including funk and country.
ENGLISHcreations.guitar cable and never use an unscreenedThe higher the Gain control is set, the less effect
(unshielded) speaker cable. Also, this cablethe �treble bleed capacitorO has. As a result, at
Valve Drive Preampshould be one of good quality. If you are in anymaximum Gain settings, the bright switch will
As just stated, each amp in the range boasts a preamp stage equipped with an ECC83 Dual Triodedoubt regarding this, your Marshall dealer will behave no audible effect at all.
valve. Drawing on our vast experience in this field, we have gone to great lengths to ensure that thismore than happy to help and advise you.
precious device delivers maximum sonic benefit at all settings and volume levels. As a result, the9. Clean Volume Control
clean sounds ring with the �bell-likeO harmonics that only a valve preamp can deliver and the break-up2. Acoustic Sim. Channel Selector SwitchAs its name suggests, this control determines
is never harsh or unnatural sounding. Whenever an AVT Overdrive channel is selected the ECC83OsAllows selection of the Acoustic Simulatorthe volume of the clean channel. The actual
dual triode is saturated to its limit, providing the dynamics and feel worthy of a place in the Marshallchannel via the front panel.setting you choose will be dependent on how
hall of fame.loud you want the channel to be, and also on
3. Top Controlthe type of sound you have selected on the pre-
Power Amp DeliveryThis control takes the channelOs sound from aamp. Due to the remarkable realism of our
The same sort of toneful care and attention was also focused on the all-important power stages of themellow, acoustic tone (similar to a microphoneAdvanced Valvestate Technology, once the
AVT series too. Our goal was to ensure that each one would create the warm, musical feel and 3-placed towards the neck of the instrument) allVolume control is turned-up past a certain point
dimensional sounds that have made our all-valve power amps world renowned. In addition, these AVTthe way to a bright, piezo-like acoustic soundthe preamp will start to push the power amp
products were designed to deliver the goods in the often hostile and unpredictable environment of theand all points in-between.section into creating its own, desirable distortion
live performance stage - which is why all the AVT power amps, from the AVT50X upwards, are fan- just like an all-valve Marshall amp. When this
cooled for optimum reliability.Note: The ampOs Master Presence control (21)occurs, the AVTOs power amp will start to add
affords you further adjustment of the high end.musical harmonics, compression and �break-upO
'Extended Bass Response' Loudspeakersinto your sound.
Knowing how important the relationship between the amplifier and speaker is, this is another area4. Body Switch
where we spent a great deal of time and effort when developing the AVT Series. By working extremelyThis changes the �body resonanceO simulation ofNote: As each channel has its own volume
closely with our long-term colleagues at Celestion Loudspeakers, we have successfully developed athe channel from that of a regular sized, steel-control, you can easily balance the levels of all
range of speakers which, through radical design, re-define the state-of-the-art in rock guitarswitch �outOfour channels as you so desire. Once set to your
reproduction. In a nutshell, they allow the compact closed back cabinets used in the AVT range, tobodied, �JumboO switch �inOsatisfaction, these controls can be left alone and
maintain the bottom end delivery normally only associated with a full 4 x12 cabinet set-up.you can use the ampOs Master Volume knob (20)
5. Volume Controlto set your overall volume level.
DFX OnboardThis dictates how loud the Acoustic Simulator
At Marshall our aim is to create products that offer our fellow guitarists true inspiration in the practiceChannel will be.10. Clean Tone Controls
and performance of their art. When integrating DFX (Digital Effects) into the tonal topology of AVT, theThe Clean channel is equipped with rotary Bass,
greatest care was taken to ensure that the highest level of signal integrity was maintained. Through6. Clean Channel Selector SwitchMiddle, and Treble controls. These three passive
careful shaping and mixing of the �wetO processedunprocessedThis allows selection of the Clean channel viaEQ controls are designed to achieve maximum
that the onboard effects enhance your tone while adding none of the nasty, artificial �grainO oftenthe front panel.tonal variation from your AVT amplifier and, just
associated with DFX. Different effect types can be assigned to the Clean and Overdrive channels andlike the tone controls on our famous all-valve
can, of course, be turned on and off via the sturdy 6-way LED foot controller supplied with your amp.7. Clean Channel Gain Controlamps, are highly inter-dependent on each other.
This rotary control regulates the drive into theAs a result, the way each one functions depends
two cascaded valve stages of the preamp.on the exact position of the other two controls.
Lower settings will give you a wide range of wellThis is especially true of the Bass and Treble
defined, warm clean tones.controls in relation to the Middle control. As you
will discover, the lower the Middle control is set,
At higher Gain settings you will pass throughthe more �reactiveO the others become.
natural, valve-induced compression and into an
increased level of desirable �break-upO (a.k.a.As tone is very much down to personal taste,
�crunchO) which is perfect for subtly overdrivenexperimentation and experience is probably the
blues/rock.best way of learning how these three controls
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