VVT X-40 Overdrive DM Head User manual

X-Model Amplifiers
Hand Made in the USA
by
Vintage Vacuum Tube Amps
520 University Dr.
Waldorf, MD 20602
P one 240-222-3830
www.vvtamps.com
X-40 Overdrive DM* Head
X-40 Overdrive DM* Combo
(*Dual Master)

Welcome To The Family
Congratulations and thank you for choosing your X-Model amplifier. At VVT we know you are
constantly searching for new sounds and new ways to improve your existing sound. e
understand the constantly evolving nature of artistic creativity and the search for perfect tone
to complement your ever-widening musical vision. Providing the tools to help you to create
your own sonic signature is our primary mission. At 19 lbs, The X-40 is an amazing tool to
use for gigs and in the studio.
As with all VVT amplifiers, the X-Model beautifully accentuates the inherent qualities of any
instrument. They breathe and dynamically respond to your playing technique exactly the way
a great amplifier should. The VVT X-Model and other models are all tube designs: no
clipping diodes or transistors are used in any part of the signal path. The preamp section has
a broad dynamic range which accounts for its extra touch sensitivity, tonal shaping
characteristics, and excellent guitar volume control response. In addition, overdrive voicing
can easily be dialed up using the unique DRIVE/LEVEL structure and can be tweaked to
perfection for any guitar/pickup combination. The presence control adds dimension of an in
your face sparkle to a smoother jazzy tone. From there, the boost switch lifts the mid
frequencies in the 1K Hz range. Just a little tweaking on your guitar volume and tone controls
will yield a surprising amount of control. All VVT X-Model amps are designed for big round
tone and dynamic response at low to medium guitar volumes and provide a rapid but smooth
transition into saturation - turning rich and thick at full guitar volume. The combination of
preamp voicing and power amp response will enhance the unique character of any guitar and
pick-up combination. And, with these amps, you can have your cake and eat it too: Preamp
Distortion and Output Tube Distortion without blowing out the walls.
The specially designed, precision wound, power and output transformers produce optimum
performance, reliability, and stability delivering excellent power tube response and just the
right amount of natural output transformer saturation and compression.
Getting familiar with the X-Model is easy, so don’t be terribly surprised when you find yourself
up and running in no time; although, we highly recommend you spending some quality time
with your amp due to it’s chameleon like qualities. You may find yourself dialing in tones you
thought might never be possible or find some tones unique to your playing style. First hand
experience and real world application will yield the ultimate satisfaction. Finding your own
path of comprehension and self-expression can only be achieved by mastering your
instrument in combination with your new amp.
First, we need to stress a few important cautionary notes.

Important Information:
1. Please read all of the information contained in this document.
CAUTION!
2. This is a ver high gain amplifier designed for professional musicians. The tone is
not scooped and muffled like mass produced amplifiers to keep guitarist from
settings that will ma cause oscillation. Use some judgment during operation. With
the Overdrive and Boost engaged ou cannot crank the Drive, and OD Level
controls and not expect the amp to complain with loud squeals. The amplifier will
greatl amplif an thing received b our pickups; this includes an noise, as well
as our pla ing. It is recommended that ou disengage the OD and Boost when ou
are not pla ing. Or, use the Volume control on our guitar to reduce noise received
b our pickups.
3. HUM - Some hum or amplified noise is normal. As the volume and gain is increased amplified noise
will be noticeable and will be more apparent in a quiet room. Additionall , tubes have inherent noise
as do resistors. However, excessive hum (noise) can be caused b electronic devices such as neon
signs, light dimmers, fluorescent lights, aquariums, etc. located near the amp or our guitar. Hum
can var with different outlets, rooms, buildings and guitar pickups.
4. Do not operate this amp without a speaker load
5. Output tube current is controlled with fixed bias. If ou change the output tubes, the bias must be
checked and adjusted for the new tubes b a qualified technician. Failure to follow this advice could
result in premature tube failure or catastrophic transformer failure.
CAUTION!
RISK OF ELECTRIC SHOCK
WARNING: This guitar amplifier contains lethal HIGH VOLTAGE. To avoid risk of injury or death from electric
shock, do not open the enclosure or remove the chassis from the cabinet. Refer all service work to qualified
personnel.
WARNING: This amplifier contains Vacuum Tubes. Vacuum tubes are heated to produce electrical currents and
they get HOT. Touching this surface could result in bodily injury. To reduce the risk of injury from a hot
component, allow the surface to cool before touching. DO NOT touch or attempt to remove vacuum tubes until
they have had time to cool.
IMPORTANT! FOR YOUR PROTECTION, PLEASE READ THE FOLLOWING:
ATER AND MOISTURE: This amplifier should not be used near water (near a bathtub, washbowl, kitchen
sink, laundry tub, in a wet basement, or near a swimming pool, etc). Care should be taken so that objects do not
fall and liquids are not spilled into the enclosure through openings.
PO ER SOURCES: The amplifier should only be connected to a 120VAC household power source.
GROUNDING OR POLARIZATION: Precautions should be taken so that the grounding or polarization is not
defeated. Do not remove the ground from the power cord.
PO ER CORD PROTECTION: Power supply cords should be routed so that they are not likely to be walked on
or pinched by items placed upon or against them, paying particular attention to cords at plugs, convenience
receptacles, and the point where they exit from the amplifier.
SERVICING: You should not attempt to service this amp beyond that described in the operating instructions. All
other servicing should be referred to qualified service personnel.
FUSING: Your amplifier is equipped with a marked fuse receptacle, replace only with the same type fuse.

It All Starts Here
The input level of this amplifier determines how much drive and sustain your guitar will
produce. Tonal balance, which we refer to as VOICING, determines how your amp will
respond to your playing style and how it will sound with a particular guitar. Like all amplifiers,
the X-Model amps have tone and gain controls. But, unlike other amplifiers, these amps give
you total control over VOICING and GAIN.
The VOLUME control increases preamp gain as you rotate the knob clockwise. As the gain
increases, the tonal balance is shifted from treble and upper mid frequency emphasis which
produce up front sparkling tone, to a lower mid and bass emphasis, which produces a thick
meaty tone. The VOLUME CONTROL AFFECTS BOTH CLEAN AND OVERDRIVE
CHANNELS. In order to achieve a smooth, saturated, overdrive tone the VOLUME control
needs to be set at least the 12 o’clock position.
The CLEAN LVL control is the Master volume for the CLEAN CHANNEL ONLY.
The DRIVE Control increases the gain in overdrive channel. As you rotate the knob clockwise
you will notice an increase in drive as well as a certain amount of compression, though the
sonic qualities will shift as well; as the gain increases the tone will become brighter with more
bite.
The OD LEVEL Control is the Master volume for the OD CHANNEL. Use the CLEAN LVL
and OD LEVEL controls to balance volume between the clean and overdrive channels. The
tonal effects while increasing the OD LEVEL provide a meatier fuller tone. This is where
balancing both Gain (Drive) and OD Level controls is key to achieving the desired tone.
Different combinations of VOLUME, DRIVE, and OD LEVEL settings, will have a dramatic effect on the response
of the amplifier and the personality of your instrument. It is easy to get familiar with the action of these controls
and you’ll be amazed with your ability to make any guitar sound mellow, fat, soulful, or aggressive.

X-Model Controls
FRONT PANEL, RIGHT TO LEFT:
1. INPUT - GUITAR INPUT. Plug in our guitar or stomp box here.
2. BOOST Switch – Turns the Mid Frequenc boost on or off for the clean and overdrive channel.
3. OVERDRIVE Switch – Turns the Overdrive Channel on or off.
Note: This Overdrive Switch provides the same functions as the footswitch. If this switch is in the ON
(UP) position the footswitch WILL NOT WORK. Likewise, if the footswitch for this function is ON the
front panel switches WILL NOT WORK..
4. VOLUME – Sets the amount of drive for the clean and overdrive channels. This first gain control also serves
as a tone shaping control, counter-clockwise for crisp and articulate, clockwise for thick and saturated.
5. CLEAN LVL – Controls the loudness of the Clean Channel onl .
6. EQUALIZATION SECTION – Passive / Interactive tone controls.
a. TREBLE – High frequenc equalization.
b. MIDDLE – Mid frequenc equalization.
c. BASS – Low frequenc equalization.
7. DRIVE – Sets the amount of drive for the OD channel onl
8. OD LEVEL – Sets the output level of the OD channel onl
9. PRESENCE – High frequenc variable feedback in power amp section.
10. STANDBY Switch - Turns ON/OFF DC voltage to the amp.
11. POWER Switch – Turns AC power ON or OFF. Lights when the POWER Switch is ON
REAR PANEL, RIGHT TO LEFT:
1. AC MAINS INPUT – 120VAC 60Hz Power Inlet. Use onl the factor supplied AC cord set or a UL approved
equivalent t pe.
2. AC Power FUSE – 2 Amp Slo-Blo Fuse – Onl replace with same t pe and rating.
3. EFFECTS LOOP – Send/Return
4. SPEAKER Jacks – 4/816 Ohm Outputs. (NOT SHOWN) Use a speaker cable to connect to our speaker
cabinet. DO NOT use a guitar/audio cable; the cannot handle the current necessar to drive our speakers
and ma damage the amplifier.
5. FOOTSWITCH Jack – Tip/Ring/Shield jack. Plug the supplied footswitch in here.
FOOTSWITCH:
1. OD Switch – Turns the OD Channel ON or OFF
Note: The front panel Overdrive Switch must be in the OFF (DOWN) position to activate the FOOTSWITCH.
The LED on the FOOTSWITCH will light when the Overdrive functions is active.
2. BOOST Switch – Turns the alternative mid frequenc boost ON or OFF.
Note: The front panel BOOST Switch must be in the OFF (DOWN) position to activate the FOOTSWITCH.
The LED on the FOOTSWITCH will light when the BOOST functions is active

X-Model Overdrive Tone
A FEW SETTINGS TO START WITH
CLASSIC ROCK MODE
A good starting point for those looking for great 70’s/80s style Rock
JAZZ FUSION
A good starting point for a clean spanky tone to a thick fat Overdrive tone
HEAVY METAL
Enter Heavy Metal Land. Go fromAC/DC type tones on the clean channel to an over the top feedback on demand tone.
Also great for your Van Halen type tones.
X-Model Sample Setting diagrams & notes
(Make copies & use!
Clean Channel
NOTES:
__________________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
_________________________________________________________________________
OD Channel
NOTES:
_________________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________
________________________________________________________________________

Tube Function and Location Chart
Tube locations are indicated in the diagram below. All tubes are factory selected for superior
performance, consistent tone quality, and reliability. hile substituting other brands may not
cause damage to the amplifier this may affect amplifier performance in unpredictable ways.
For best performance, replace only with factory recommended tubes. Substituting other tube
types is not recommended.
Warning! This amp operates with fixed bias.
If the output tubes are changed, the bias MUST be set to operate with the new tubes. Failure
to properly set bias ILL affect tone, may ruin your new tubes, or DAMAGE your amplifier. If
you do not know how to adjust output tube bias please take your amp to a qualified tube amp
technician. e recommend setting the bias between 50% and 70% of maximum plate
dissipation by monitoring cathode current. Failures caused by improper output tube bias are
not covered by your warranty
Factory recommended tubes are listed under each location. Numbering sequence is left to
right looking at back of amp starting with V1 to the far left side.
V1 (shielded tube) - JJ ECC83S (12AX7), Clean Channel
V2 (shielded tube) - JJ ECC83S (12AX7), OD Channel
V3 (shielded tube) - JJ ECC83S (12AX7), Phase Inverter
V4-V5 – TAD (Tube Amp Doctor) 6L6 GC-STR
Failures caused by improper output tube bias are not covered by your warranty.

Keep the information on this page for your records.
MODEL
______________________
SERIAL NUMBER
______________________
OPTIONS INCLUDED
________________
PURCHASE DATE
Vintage Vacuum Tube Amps
520 University Dr.
Waldorf MD 20602
[phone]
www.vvtamps.com
X40 Head or Combo
LIMITED WARRANTY
This amp is guaranteed against failure. Vacuum tubes are guaranteed for 60 DAYS from the date of
purchase. If a tube fails within the 60 day period, VVT Amps will replace the tube at no charge. All
other electronic components are guaranteed for FIVE YEARS. The cabinet is guaranteed against
structural defects for ONE YEAR. VVT Amps will service your amplifier and supply all parts at no
charge providing the unit is under warranty. Any shipping costs associated with repairs are your
responsibility. VVT Amps DOES NOT PAY FOR PARTS OR SERVICE OTHER THAN OUR O N. A
COPY OF THE ORIGINAL SALES RECEIPT IS REQUIRED TO VERIFY YOUR ARRANTY. VVT
Amps assumes no responsibility for external speakers or other equipment damaged by this guitar
amplifier. This warranty does not cover, and no liability is assumed, for damage due to: natural
disasters, accidents, abuse, loss of parts, lack of reasonable care, incorrect use, or failure to follow
supplied instructions. Accidental damage to the amplifier, cabinet, or vinyl covering is not covered.
This ARRANTY does not apply to VVT amplifiers that have been tampered with, damaged by
shipping carriers, reverse engineered, or modified. This warranty is void if the amplifier is used with
power attenuator type devices (Power Soaks, Air Brakes, Hot Plates etc.). VVT Amps, Inc. reserves
the right to suspend or terminate the arranty at our sole discretion, should damage from any of the
above limitations and or exclusions be detected upon examination. This warranty is in lieu of all other
warranties, expressed or implied. No representative or person is authorized to represent or assume
for VVT Amps any liability in connection with the sale or servicing of VVT Amps products. VVT Amps
SHALL NOT BE LIABLE FOR INCIDENTAL OR CONSEQUENTIAL DAMAGES. If service is required
you may contact VVT Amps at 240-222-3830 or [email protected]. e will respond as soon as
possible and make arrangements to repair your amplifier. If your unit is out of warranty, VVT Amps will
repair your amplifier but you will be charged the current RATE for parts and labor.

Specifications:
Model Name X-40 Overdrive Model (Head)
Product Number 404441091
Model Number 07211955-0001
Series X-Model
Type All Tube Amp
Audio Output 40 Watts into 8 o ms
Output Impedance 4/8/16 o ms
Speakers N/A
C annels Two C annels – Normal/Overdrive – One Input
Features 100% Handmade Guitar Amplifier
VVT Transformers – Made in t e USA
Voidless Plywood Cabinet,
Steel Reinforced Duty Handle,
Controls Front Panel: Rig t to Left
Input Jack, OD Switc , Mid Boost Switc , Volume, Clean Lvl,
Treble, Middle, Bass, Drive, OD Level, Presence
Standby Switc , Power Switc wit indicator
Back Panel: Rig t to Left
AC Power Inlet
Fuse
Speaker Jack
Effects Loop Jacks
Footswitc Jack
Covering Black Textured Vinyl - Standard
Weig t 20 lb.
Dimensions Heig t: 8”
Widt : 14”
Dept : 8”
Tube Complement 2 TAD 6L6WGC-STR Output Tubes
3 X JJ ECC83S/12AX7 Preamp Tubes
Accessories Footswitc – Included wit amp P/N - XOD0001
Options N/A
Introduced 10/2008
Notice Product Prices, Features And Specifications Are Subject To C ange
Wit out Notice

Model Name X-40 Overdrive Model (Combo)
Product Number 404441093
Model Number 07211955-0003
Series X-Model
Type All Tube Amp
Audio Output 40 Watts into 8 o ms
Output Impedance 8 o ms
Speakers One 12” Speaker
C annels Two C annels – Normal/Overdrive – One Input
Features 100% Handmade Guitar Amplifier,
Steel Reinforced Duty Handle,
Controls Front Panel: Rig t to Left
Input Jack, OD Switc , Mid Boost Switc , Volume, Clean Level,
Treble, Middle, Bass, Drive, OD Level, Presence
Standby Switc , Power Switc wit indicator
Back Panel: Rig t to Left
AC Power Inlet
Fuse
Speaker Jack
Footswitc Jack
Covering Black Textured Vinyl
Weig t 38 lb.
Dimensions Heig t: 19”
Widt : 20”
Dept : 11”
Tube Complement 2 X 6L6WGC-STR Output Tubes
3 X ECC83S/12AX7 Preamp Tubes
Accessories Footswitc – Included wit amp P/N - XOD0001
Options N/A
Introduced 8/2009
Notice Product Prices, Features And Specifications Are Subject To C ange
Wit out Notice