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Addendum
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IMPORTANT SAFETY INSTRUCTIONS
• Read these instructions.
• Keep these instructions.
• Heed all warnings.
• Follow all instructions.
• Do not use this apparatus near water.
• Mains powered apparatus shall not be exposed to dripping or
splashing and that no objects filled with liquids, such as vases,
shall be placed on the apparatus.
• Clean only with dry cloth.
• Do not block any ventilation openings, install in accordance with
the manufacturer’s instructions.
• Do not install near any heat sources such as radiators, heat
registers, stoves, or other apparatus (including amplifiers) that
produce heat.
• Do not defeat the safety purpose of the polarized or groundingtype plug. A polarized plug has two blades with one wider than
the other. A grounding type plug has two blades and a third
grounding prong. The wide blade or the third prong are provided
for your safety. If the provided plug does not fit into your outlet,
consult an electrician for replacement of the obsolete outlet. (for
U.S.A. and Canada)
• Protect the power cord from being walked on or pinched
particularly at plugs, convenience receptacles, and the point
where they exit from the apparatus.
• Only use attachments/accessories specified by the manufacturer.
• Unplug this apparatus during lightning storms or when unused for
long periods of time.
• Tur ning off the power switch does not completely isolate this
product from the power line so remove the plug from the socket if
not using it for extended periods of time.
• Refer all servicing to qualified service personnel. Servicing is
required when the apparatus has been damaged in any way,
such as power-supply cord or plug is damaged, liquid has been
spilled or objects have fallen into the apparatus, the apparatus
has been exposed to rain or moisture, does not operate normally,
or has been dropped.
• Do not install this equipment on the far position from wall outlet
and/or convenience receptacle.
• Do not install this equipment in a confined space such as a box
for the conveyance or similar unit.
• Use only with the cart, stand, tripod, bracket, or table specified by
the manufacturer, or sold with this apparatus. When a cart is
used, use caution when moving the cart/apparatus combination
to avoid injury from tip-over.
The lightning flash with arrowhead symbol
within an equilateral triangle, is intended to
alert the user to the presence of uninsulated
“dangerous voltage” within the product’s
enclosure that may be of sufficient magnitude
to constitute a risk of electric shock to
persons.
The exclamation point within an equilateral
triangle is intended to alert the user to the
presence of important operating and
maintenance (servicing) instructions in the
literature accompanying the product.
THE FCC REGULATION WARNING (for U.S.A.)
This equipment has been tested and found to comply with the
limits for a Class B digital device, pursuant to Part 15 of the
FCC Rules. These limits are designed to provide reasonable
protection against harmful interference in a residential
installation. This equipment generates, uses, and can radiate
radio frequency energy and, if not installed and used in
accordance with the instructions, may cause harmful
interference to radio communications. However, there is no
guarantee that interference will not occur in a particular
installation. If this equipment does cause harmful interference
to radio or television reception, which can be determined by
turning the equipment off and on, the user is encouraged to try
to correct the interference by one or more of the following
measures:
• Reorient or relocate the receiving antenna.
• Increase the separation between the equipment and receiver.
• Connect the equipment into an outlet on a circuit different from that
to which the receiver is connected.
• Consult the dealer or an experienced radio/TV technician for help.
Unauthorized changes or modification to this system can void
the user’s authority to operate this equipment.
CE mark for European Harmonized Standards
CE mark which is attached to our company’s products of AC
mains operated apparatus until December 31, 1996 means it
conforms to EMC Directive (89/336/EEC) and CE mark
Directive (93/68/EEC).
And, CE mark which is attached after January 1, 1997 means it
conforms to EMC Directive (89/336/EEC), CE mark Directive
(93/68/EEC) and Low Voltage Directive (73/23/EEC).
Also, CE mark which is attached to our company’s products of
Battery operated apparatus means it conforms to EMC
Directive (89/336/EEC) and CE mark Directive (93/68/EEC).
IMPORTANT NOTICE TO CONSUMERS
This product has been manufactured according to strict
specifications and voltage requirements that are applicable in
the country in which it is intended that this product should be
used. If you have purchased this product via the internet,
through mail order, and/or via a telephone sale, you must verify
that this product is intended to be used in the country in which
you reside.
WARNING: Use of this product in any country other than that
for which it is intended could be dangerous and could invalidate
the manufacturer’s or distributor’s warranty.
Please also retain your receipt as proof of purchase otherwise
your product may be disqualified from the manufacturer’s or
distributor’s warranty.
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Introduction
WELCOME ABOARD AGAIN!
any thanks for adding a VOX Valvetronix head to your sonic arsenal.
We’re sure it’ll give you countless hours of great guitar tones that will
M
the Combo Manual. This addendum will cover speaker connections and impedance
settings for your AD60VTH or AD120VTH head. Everything else, and I mean everything else is already covered in the Combo Manual…I mean
if you’re sitting down, rocking out and have a few questions, crack open the “Guide”
man! It’s all there…except for what’s here.
Right. Moving on. You’ll notice that almost all the functions of these heads are
identical to their combo brothers. So what’s different and why am I reading this
addendum do you ask? Did you read the above? Speaker connections and impedance settings, that’s why! Let’s move on shall we? F
chart below, check it out…
as good as they sound! You may have noticed that this is an addendum to
Guitarists Guide!
oolproof er… guitarist friendly
feel
So
IMPORTANT NOTE: Do NOT use a speaker cabinet with a Wattage rating of less than 60
Watts, or less than the output power you’ve selected with the POWER SELECT control
(see page 20 in
speaker– and that’s not recommended.
ANOTHER IMPORTANT NOTE: ALWAYS use speaker cables (unshielded) to connect
speaker cabinets. NEVER use guitar (shielded) cables.
Do not connect or disconnect speaker cables whilst the amplifier is operational.
Ensure that the amplifier is turned off before doing this.
A Guitarists Guide
). If you ignore this, you could end up blowing a
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AD60VTH SPEAKER CONNECTION CHART
AD60VTH
If you use: Set Output Impedance Select to: Use Speaker Jack:
AD212/AD412 mono 16 Ohms Either one
AD212 or AD412
One 16 Ohm cabinet 16 Ohms Either one
One 8 Ohm cabinet 8 Ohms Either one
One 4 Ohm cabinet 4 Ohms Either one
Two 16 Ohm cabinets 8 Ohms Both
Two 8 Ohm cabinets 4 Ohms Both
Two 4 Ohm cabinets DO NOT DO THIS. YOU WILL CAUSE DAMAGE!!!!!!
Input
One 8 Ohm cabinet
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Input
Input
Two 8 Ohm cabinets
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AD120VTH SPEAKER CONNECTION CHART
AD120VTH
If you use: Set Output Impedance Select to: Use Speaker Jack:
**AD212/AD412 Stereo 8 Ohms One from L & R ch.
AD212 or AD412
One 16 Ohm cabinet 16 Ohms One from L or R ch*
One 8 Ohm cabinet 8 Ohms One from L or R ch*
One 4 Ohm cabinet 4 Ohms One from L or R ch*
Two 16 Ohm cabinets 16 Ohms One from L & R ch.
Two 8 Ohm cabinets 8 Ohms One from L & R ch.
Two 4 Ohm cabinets 4 Ohms One from L & R ch.
Four 16 Ohm cabinets 8 Ohms
Four 8 Ohm cabinets 4 Ohms
Four 4 Ohm cabinets DO NOT DO THIS. YOU WILL CAUSE DAMAGE!!!!!!
Input
One 8 Ohm cabinet
All four. One for each cabinet
All four. One for each cabinet
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Input
Input
Two 8 Ohm cabinets
InputInput
Input
Four 8 Ohm cabinets
Input
*Because the AD120VTH is a stereo head running at 60 Watts per side, when you
hook up a single cabinet to one side, you will only get 60 Watts in mono. You will
not get the full effect of running this head at 120 Watts in stereo. We recommend
stereo!!!!
**This option is highly recommended! This will make you a rock star. OK, maybe
not a rock star but you will sound great. If you don’t have this cabinet…you need it.
If you have it…stop reading and get on with playing your guitar!!!
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NERDY IMPED ANCE INFORMATION AHEAD
he following is some information that you’ll find useful for hooking up your
Valvetronix AD60VTH or AD120VTH head. When you’re done with this,
T
hooking up speaker cabinets in series or parallel.
In multiple speaker cabinet configurations, you will have to use a little mathematics
(Ohm’s law) in order to figure out the correct setting. Don’t worry though; it’s easier
than you might think! The formula will depend on whether you are hooking the
cabinet(s) up in series or parallel. Parallel is more common which is how the
AD60VTH and AD120VTH work.
Parallel
When using two cabinets of the same impedance in parallel, just divide the impedance of one cabinet by 2. For example, when using two 8 Ohm cabinets in parallel,
set the impedance selector on the amp for 4 Ohms (8 divided by 2 equals 4). When
using two cabinets and each is 16 Ohms set the amp for 8 Ohms. Here is the
Ohm’s Law formula for connecting two speakers (or cabinets) in parallel:
you’ll be a smarter and better person! Plus you’ll know the correct way for
Let’s take two 16 Ohm cabinets for this example:
16 x 16
R3 =
16 + 16 32
Series
In a series configuration, all you do is add the individual impedances of the cabinets. For example, if you hook up two cabinets, where each is 8 Ohms (8 plus 8),
the result is 16 Ohms. If one cab is 8 Ohms and the other is 4 Ohms, the total
impedance is 12 Ohms. There are no 12 Ohm settings on amps, so set your amp
to 16 Ohms.
R1 is the impedance of our first cabinet; R2 is the impedance of the second one
and R3 is the resulting impedance when they are hooked-up together.
R1 x R2
R3 =
R1 + R2
Using two cabinets of different impedance is a bit more complicated. Check it out…
Let’s take one 16 Ohm cabinet and one 8 Ohm cabinet for this example:
R3 =
If the minimum impedance of your amp is 8 Ohms do not use it with a 16 and 8
Ohm cabinet in parallel. If the minimum impedance or your amp is 4 Ohms, you are
OK to go.
8
16 x 8
16 + 8 24
256
=
128
=
=8 Ohms
=5.33 Ohms
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Specifications
Number of amp types: 16
Number of effects:
Drive types: 10
Modulation types: 5
Delay types: 3
Reverb types: 3
Noise reduction: 1
Number of programs: 32 (8 bank x 4 channel)
Number of inputs:
AD60VTH
Top panel: 2 (High & Low)
Rear panel: 1 x Loop return
1 x Foot controller jack
AD120VTH
Top panel: 2 (High & Low)
Rear panel: 2 x Loop return
1 x Foot controller jack
Number of outputs:
AD60VTH
Rear panel: 1 x Loop send
1 x Phone out
1 x Line out
2 x Speaker out (Parallel connection)
AD120VTH
Rear panel: 2 x Loop send
1 x Phone out
2 x Line out
4 x Speaker out
L ch: 2 x Speaker out (Parallel connection)
R ch: 2 x Speaker out (Parallel connection)
Power output
AD60VTH: 60 Watts RMS @8 ohm
AD120VTH: 60 Watts RMS x 2 (L/R) @8 ohm
Tuning range: A0–C7 (27.5 Hz–2093 Hz)
Tuner calibration: A = 438–445 Hz
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Signal processing
A/D Conversion: 20 bit
D/A Conversion: 20 bit
Sampling frequency: 48 kHz
Power supply requirements: AC local voltage
Power consumption
AD60VTH: 90 W
AD120VTH: 175 W
Dimension (W x D x H) (including protrusions)
AD60VTH: 690 x 272 x 250 (mm) / 27.17” x 10.71” x 9.84”
AD120VTH: 690 x 272 x 250 (mm) / 27.17” x 10.71” x 9.84”
Weight (including protrusions)
AD60VTH: 16 kg / 35.27 lbs.
AD120VTH: 18 kg / 39.68 lbs.
Accessories
Included: Power cable, Speaker cable (AD60VTH x 1 / AD120VTH x 2)
Optional: VC-4 Foot controller, AD212/AD412 Extension speaker cabinet
*Specifications and features are subject to change without notice
FOR MORE INFORMATION ON VALVETRONIX AMPLIFIERS PLEASE VISIT
WWW.VALVETRONIX.COM
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