Marshall Amplification EFFECT PEDAL VT-1 VIBRATREM User manual

Marshall Amplification plc
Denbigh Road, Bletchley,
Milton Keynes, MK1 1DQ, England
Tel: [phone] Fax: [phone]
Web Site: www.marshallamps.com
Whilst the information contained herein is
correct at the time of publication; due to our
constant improvement and development,
Marshall Amplification plc reserve the
right to alter specifications without
prior notice.
‘Valve-like 2nd harmonics
and feel’
‘Classic compression’
‘Like adding another amp to your rig,
incredibly versatile distortion pedal’
‘Distortion so extreme it’ll
make the earth move !’
‘Based on the classic chorus built
into our Valvestate & Acoustic
Soloist amps’
‘Vintage vibrato and tremolo’
TONE YOU CAN TRUST
TONE YOU CAN TRUST
MODE SPEED DEPTH SHAPE
VIBRATO TREM
MODE SPEED DEPTH SHAPE
VIBRATO TREM
MODE SPEED DEPTH SHAPE
VIBRATO TREM
MODE SPEED DEPTH SHAPE
VIBRATO TREM
Vibratrem Suggested Settings
VINTAGE TREM (Amp: Clean)
SLOW SWELL (Amp: Clean)
CLASSIC VIBRATO (Amp: Clean)
SWITCHING VIBRATO (Amp: Clean)

From The Chairman
I would like to personally thank you
for selecting one of our effects
pedals.
For over 36 years the Marshall
name has been synonymous with
the greatest guitar tones in music.
We have worked hand in hand with
guitarists from all levels throughout
the world to maintain and improve
that special ingredient, “The
Marshall Sound.”
Our new range of effects pedals
gives the opportunity to augment
the classic Marshall tone or to add
Marshall character to a guitar set-
up. They are made with the same
utmost attention to quality, in both
materials and manufacture as our
world renowned amplifiers, cabinets
and combos, in order to provide you
with optimum reliability and tone.
I would like to wish you every
success with all of your musical
endeavours and also your new
Marshall effects pedal, which I am
sure you will find a pleasure to play
for many years to come.
Yours Sincerely,
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MODE SPEED DEPTH SHAPE
6
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VIBRATO TREM
Vibratrem (VT-1)

INTRODUCTION
Of all the retro effects to hit the shops in recent years,
perhaps the most authentic and coolest is tremolo.
Instantly calling up the spirit of the 60s, Tremolo was the
first effect to appear on a Marshall amp in the early 1960s.
The late 90s sees Marshall updating the tremolo effect in
the form of the Vibratrem.
By using split phase modulation a truely awesome stereo
sound field can be created by connecting the VT-1 up to two
amplifiers.
The Vibratrem features a passive bypass for the main
signal path to ensure complete tonal integrity and has a
quality of tone matched only by its versatility.
Here follows a complete run down of the Vibratrem's
features for your information. We have also enclosed a
number of suggested settings to help guide you. it should
be remembered though that these are only suggested
settings and you should really take the time to experiment.
If you take the time to explore the different effects within
the Vibratrem, you won’t be disappointed.
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WARNING!
Important safety instructions!
A. PLEASE read this instruction manual carefully before use.
B. ALWAYS have this equipment serviced or repaired by
competent qualified personnel. There are no user serviceabe
parts.
C. Servicing is required when the apparatus has been
damaged in any way, if it does not operate normally or has
been dropped.
D. NEVER use a pedal in damp or wet conditions.
➲Note: This equipment has been tested and found to
comply with the requirements of the EMC directive
(Environments E1, E2 and E3).
➲Note: It is recommended that all audio cables used to
connect to the pedal are of a high quality screened type.
These should not exceed 10 metres in length.
Follow all instructions and
heed all warnings
KEEP THESE INSTRUCTIONS !
!
SETTING UP
Always use good quality shielded leads.
Always use 9V regulated DC supply with centre negative.
Although it may seem obvious the first action in achieving
a good effected sound (be it duration / compression etc.) is
to find the perfect bypassed sound. This will then allow the
AMP PEDAL GUITAR
9V DC REG. ADAPTOR

5. DC Input
For input of a 9 V DC adaptor should you not wish to
use batteries.
6. LED
Indicates when the Vibratrem is in operation.
7. Depth
Controls the depth of the effect. Turn the control anti-
clockwise and the effect will be more subtle, turn the
control clockwise and the modulation of the effect will be
increased.
8. Shape
The Shape control affects the modulation waveform of the
VT-1. In short, the shape of the modulation waveform
determines the manner in which the VT-1 circuitry turns
the signal level up and down in creating the tremolo and
shifts phase in the case of vibrato.
The triangle wave ( ) creates a gradual swelling
tremolo and subtly phasing vibrato.
The square wave ( ) produces a more abrupt change in
volume when Tremolo mode is engaged and a ‘de-tuned’
pitch shifting vibrato in Vibrato mode.
9. In Jack
This is the input jack, for connection to your guitar or to
another effects pedal.
10. Foot Switch
For switching the Vibratrem on and off.
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correct level to be set with the effect unit to allow a cut or
boost in volume and a realistic tone.
On clean channels it is advisable to set the gain (or
volume) to a setting of no less than one quarter maximum so
as not to get unrealistic results due to any volume dependent
tonal shaping on the amplifier preamp.
FEATURES
1. ‘Out 2’ Jack Socket
The Vibratrem is a stereo footpedal. If you are using the
Vibratrem in a stereo configuration this Jack socket is for
your second output.
2. ‘Out 1 - Mono’ Jack Socket
This is the main output of the Vibratrem and is for
connection to the amplifier or to another effects pedal.
3. Mode
This allows you to switch between the Vibratrem's two
modes, Vibrato and Tremolo.
Tremolo - refers to change in signal volume. In Tremolo
mode the signal increases and decreases at a role
governed by the speed control. The tremolo on the VT-1
is specially designed to recreate the natural swell and
decay of a valve-based tremolo as found on many vintage
valve amplifiers.
Vibrato - By phase shifting the effected signal with
respect to direct, uneffected signal, a subtle pitch shifting
vibrato is created. The vibrato on the VT-1 has been
developed to closely mimic the vibrato settings on certain
vintage valve amplifiers. Note: the stereo output remains
unchanged (i.e. tremolo) in vibrato mode.
4. Speed
Alters the speed of the modulation of the effect. Turn the
control anti-clockwise and the effect will slow down.
Conversely, turn the control clockwise and the modulation
of the effect will increase in speed.

BATTERY REPLACEMENT
1. To replace the battery, open the easily accessed coin
screw battery cover plate by loosening screw as shown,
then disconnect the battery connector lead.
2. Use PP3 or
equivalent battery (for
improved battery life
use alkaline type)
3. Always ensure that
the battery is removed
when the pedal is not in
use for long periods.
4. Dispose of old battery in a safe place.
TECHNICAL SPECIFICATION
Power : 9V DC Centre Negative Regulated
Current Draw : 16mA
Controls : Vibrato and Tremolo Mode, Speed,
Depth and Shape controls.
Switches : On/Off Switch
Indicators : On/Off LED
Jacks : 1 Input, 2 Output ‘Jacksockets’
Input Impedance : 1MΩ
Output Load Impedance : < 1kΩ
Dimensions : 120mm x 65mm x 55mm
Weight : 510 grammes
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WHAT IF
NO
OUTPUT
SOUND TOO
TREBLY OR
FIZZY
UNUSUAL
HUM
BASS
FEEDBACK
SOUND TOO
MUSHY OR
BASSY
UNUSUAL
FEEDBACK
INDICATOR
LED NOT
ON
NOISE IN
BYPASS
CHECK BATTERY CHECK LEADS CHECK PEDAL CONTROLS
DC INLET CHECK AMP CONTROLS CHECK GUITAR
✓✓✓✓✓
✓
✓✓ ✓
✓✓
✓✓
✓✓ ✓✓
✓✓✓✓
✓
REDUCE
TREBLE
REDUCE
TREBLE
INPUT
LEAD
MOVE
AWAY
FROM AMP
PICKUPS
MAY BE
VIBRATING
TROUBLE SHOOTING