Manual Marshall AVT150X, 150HX, 275X (page 3 of 10) (English)

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What is AVT?

Advanced Valvestate Technology, or AVT for short, is a major step forward in hybrid amplifier design

which is exclusive to our Advanced Valvestate Series of amplifiers. It has evolved from the original,

critically acclaimed Marshall Valvestate technology, but is improved so that it emulates even more

closely the feel and response of the classic Marshall all-valve power stage...without using valves.

It is not only the power stage that has been significantly improved in the series either. Much careful

attention to detail and many hours of development have also gone into the preamp section too. As a

result, each AVT channel offers the widest possible range of control and shape to your sound, with an

ECC83 (a.k.a.12AX7) preamp valve adding to the all-important tone and feel of these latest Marshall

creations.

Valve Drive Preamp

As just stated, each amp in the range boasts a preamp stage equipped with an ECC83 Dual Triode

valve. Drawing on our vast experience in this field, we have gone to great lengths to ensure that this

precious device delivers maximum sonic benefit at all settings and volume levels. As a result, the

clean sounds ring with the ‘bell-like’ harmonics that only a valve preamp can deliver and the break-up

is never harsh or unnatural sounding. Whenever an AVT Overdrive channel is selected the ECC83’s

dual triode is saturated to its limit, providing the dynamics and feel worthy of a place in the Marshall

hall of fame.

Power Amp Delivery

The same sort of toneful care and attention was also focused on the all-important power stages of the

AVT series too. Our goal was to ensure that each one would create the warm, musical feel and 3-

dimensional sounds that have made our all-valve power amps world renowned. In addition, these AVT

products were designed to deliver the goods in the often hostile and unpredictable environment of the

live performance stage - which is why all the AVT power amps, from the AVT50X upwards, are fan

cooled for optimum reliability.

'Extended Bass Response' Loudspeakers

Knowing how important the relationship between the amplifier and speaker is, this is another area

where we spent a great deal of time and effort when developing the AVT Series. By working extremely

closely with our long-term colleagues at Celestion Loudspeakers, we have successfully developed a

range of speakers which, through radical design, re-define the state-of-the-art in rock guitar

reproduction. In a nutshell, they allow the compact closed back cabinets used in the AVT range, to

maintain the bottom end delivery normally only associated with a full 4 x12 cabinet set-up.

DFX Onboard

At Marshall our aim is to create products that offer our fellow guitarists true inspiration in the practice

and performance of their art. When integrating DFX (Digital Effects) into the tonal topology of AVT, the

greatest care was taken to ensure that the highest level of signal integrity was maintained. Through

careful shaping and mixing of the ‘wet’ (processed) and ‘dry’ (unprocessed) signals, we have ensured

that the onboard effects enhance your tone while adding none of the nasty, artificial ‘grain’ often

associated with DFX. Different effect types can be assigned to the Clean and Overdrive channels and

can, of course, be turned on and off via the sturdy 6-way LED foot controller supplied with your amp.

I. The Preamp Section

Your AVT amp boasts no fewer than four

channels: Acoustic Simulator, Clean, Overdrive

1 and Overdrive 2. The preamp section is where

the gain, tone and relative volume of these four

channels is determined.

1. Input Jack Socket

This is where you plug your guitar into the amp.

You must always use a screened (shielded)

guitar cable and never use an unscreened

(unshielded) speaker cable. Also, this cable

should be one of good quality. If you are in any

doubt regarding this, your Marshall dealer will be

more than happy to help and advise you.

2. Acoustic Sim. Channel Selector Switch

Allows selection of the Acoustic Simulator

channel via the front panel.

3. Top Control

This control takes the channel’s sound from a

mellow, acoustic tone (similar to a microphone

placed towards the neck of the instrument) all

the way to a bright, piezo-like acoustic sound

and all points in-between.

Note: The amp’s Master Presence control (21)

affords you further adjustment of the high end.

4. Body Switch

This changes the ‘body resonance’ simulation of

the channel from that of a regular sized, steel-

string acoustic (switch ‘out’) to that of a large

bodied, ‘Jumbo’ acoustic (switch ‘in’).

5. Volume Control

This dictates how loud the Acoustic Simulator

Channel will be.

6. Clean Channel Selector Switch

This allows selection of the Clean channel via

the front panel.

7. Clean Channel Gain Control

This rotary control regulates the drive into the

two cascaded valve stages of the preamp.

Lower settings will give you a wide range of well

defined, warm clean tones.

At higher Gain settings you will pass through

natural, valve-induced compression and into an

increased level of desirable ‘break-up’ (a.k.a.

‘crunch’) which is perfect for subtly overdriven

blues/rock.

8. Bright Switch

Most of the Gain controls in classic Marshall

amps have been fitted with what is known as a

‘treble bleed capacitor’. This device allows extra

high frequencies to be ‘bled’ through to the drive

section when the Gain control is at low settings.

Engaging the Bright Switch will ‘bleed’ extra high

frequencies into the drive stage of the Clean

channel, giving you a bright, clean tone perfect

for many styles, including funk and country.

The higher the Gain control is set, the less effect

the ‘treble bleed capacitor’ has. As a result, at

maximum Gain settings, the bright switch will

have no audible effect at all.

9. Clean Volume Control

As its name suggests, this control determines

the volume of the clean channel. The actual

setting you choose will be dependent on how

loud you want the channel to be, and also on

the type of sound you have selected on the pre-

amp. Due to the remarkable realism of our

Advanced Valvestate Technology, once the

Volume control is turned-up past a certain point

the preamp will start to push the power amp

section into creating its own, desirable distortion

- just like an all-valve Marshall amp. When this

occurs, the AVT’s power amp will start to add

musical harmonics, compression and ‘break-up’

into your sound.

Note: As each channel has its own volume

control, you can easily balance the levels of all

four channels as you so desire. Once set to your

satisfaction, these controls can be left alone and

you can use the amp’s Master Volume knob (20)

to set your overall volume level.

10. Clean Tone Controls

The Clean channel is equipped with rotary Bass,

Middle, and Treble controls. These three passive

EQ controls are designed to achieve maximum

tonal variation from your AVT amplifier and, just

like the tone controls on our famous all-valve

amps, are highly inter-dependent on each other.

As a result, the way each one functions depends

on the exact position of the other two controls.

This is especially true of the Bass and Treble

controls in relation to the Middle control. As you

will discover, the lower the Middle control is set,

the more ‘reactive’ the others become.

As tone is very much down to personal taste,

experimentation and experience is probably the

best way of learning how these three controls

AVT150X & AVT150HX Front Panel FeaturesIntroduction

ENGLISH

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Marshall AVT150X, 150HX, 275X Manual

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