Two-Rock Exo-15 User manual

Two-Rock
Exo-15
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OWNERS MANUAL
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Dear Customer,
Thank you for your purchase of a Two-Rock amplifier!
As a discerning guitarist, you know the road to great tone begins with
great components. Our classic design of carefully selected parts and
hand-built approach combine to make an extremely versatile instrument.
Please take the time to read this manual. We hope it will answer any
questions that you may have.
We extend a warm welcome to you as a member of a select group of
musicians who have chosen a Two-Rock amplifier.
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Important Safety Instructions
1. Read these instructions
2. Keep these instructions
3. Heed all warnings
4. Follow all instructions
5. Do not use this apparatus near water
6. Clean only with dry cloth
7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions
8. Do not install near any heat sources such as radiators, heat registers, plugs, and the point
where they exit from the apparatus
9. Protect the power cord from being walked on or pinched particularly at plugs and the point
where they exit from the apparatus
10. Only use attachments/accessories specified by the manufacturer
11. Unplug this apparatus during lightning storms or when unused for long periods of time
12. 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
13.!CAUTION:!To!disconnect!the!unit!completely!from!the!MAINS,!unplug!the!unit.!Turning!the!power!
switch!off!does!not!disconnect!the!unit!completely!from!the!MAINS.!
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Front Panel Functions
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Input Jack- High impedance input to the amplifier. Plug in your instrument here.
GAIN - Adjusts the overall gain of the amplifier. Start with this control in the 12 o’clock position
then adjust to taste. This control determines the initial character of your tone, from cleaner/brighter
tones at low settings to fatter/warmer tones at higher settings. As you turn this control up it also
introduces more gain and bass into the signal path, and reduces the amount of available clean
headroom especially when the master volume is set higher.
TREBLE - Adjusts the high frequency response. At lower settings of this control the tone will be
warmer and smoother. As you turn this control up the highs become more prominent and
aggressive adding gain to the signal as well. This control is very interactive with the Bright switch,
Middle control, and Deep switch. In the full counter-clockwise position, high frequencies are
bypassed to ground. In the full clockwise position, high frequencies are allowed to pass to the next
gain stage.
MIDDLE - Adjusts the midrange response. At low settings of this control the tone will be “scooped”
of midrange response, emphasizing the highs and lows. As this control is turned up, the midrange
frequencies are increased. This creates the “body” of your guitar’s tone and is very critical to both
the tonality, feel and overall response of the amplifier. Higher settings of this control also help your
tone to cut through the mix in both a live band situation as well as when playing the amp outdoors.
In the full clockwise position, mid-range frequencies are allowed to pass to the next gain stage.
BASS - Adjusts the bass response. In the full counter-clockwise position, low frequencies are cut
and the response of the treble and mid-range controls is greatly reduced. As this control is turned
up, the bass frequencies are increased and allowed to pass to the next gain stage.
MASTER - Adjusts the overall output level of the amplifier. At lower settings on this control the
amp will be much cleaner sounding as well as lower in volume. As this control is turned up the
power section of the amp begins to work harder which increases sustain, fullness, and touch
dynamics as well as raising the volume of the amplifier. At higher settings on this control the power
section will be pushed into natural overdrive especially if the Gain control is set higher.

CONTOUR - The contour control is an active wide band sweep. In the 12 o’clock position, the
amp’s frequency response is flat. Counterclockwise rotation reduces high end response and
increases low frequencies. Clockwise rotation decreases low end and increases the high
frequency response. This control is very useful for maintaining preamp tone control settings, while
allowing a global adjustment to compensate for differences in room acoustics, speaker cabinets,
or bright to dark guitars (single coils to humbuckers, for example). This control also actively
reduces the articulation available, allowing a softer setting, or extremely open and revealing,
depending on your individual style and requirements.
Rear Panel Functions
A/C Input - Connects the amplifier to A/C power via the power cord supplied. Unless otherwise
specified, your amplifier is designed to operate on 120 volts A/C, 60 cycles.
Fuse - See Fuse Chart
Power Switch - Turns power on.
STANDBY - This switch should be in the down/STANDBY position before you place the Power
switch to the up/ON position. After 20 seconds or more, place the Standby switch in the “up”
position to play the amplifier. When you are taking a break from playing the amp you can leave the
amp “powered up” and simply switch to the “stand-by” position to mute the output of the amplifier
and prolong power tube life.
Speaker Output Jacks - There are 3 speaker output jacks; 4, 8, and 16 ohms.
NEVER OPERATE YOUR AMPLIFIER WITHOUT A PROPER SPEAKER LOAD CONNECTED.
Be sure to match the impedance of your cabinet with the impedance (output) of the amplifier.
Power Amp In - Use this jack to connect the output from effects into the amplifier.
Pre Amp Out- Use this jack to send the amplifier’s signal to effects devices that you want to use in
the loop.
S/N- Your serial number is located here. We strongly suggest that you record this number and
have it handy in case you need service, or in the event that your amp is lost, stolen, or damaged.
NOTE: Switches are ON in the “up” position

Fuse Chart
All Fuses are 3AG Type 250 Volt, SLO-BLO
Export 100V: Domestic 120V: Export 220V,230V, 240V:
2 Amp 2 Amp 1 Amp
(Tube Complement)
V1- 12AX7, Input Tube
V2- 12AX7, Phase Inverter
V3- 6V6, Output Tube
V4- 6V6, Output Tube
V5- 5AR4, Rectifier Tube
Each fine production tube is tested and matched to our exacting specifications. External bias
adjustment and test points are located on the chassis near the output tube sockets. A digital multi-
meter and small screwdriver are required for bias adjustment.

BIAS PROCEDURE:
Make sure the speaker is connected properly, then power up the amplifier.
Set the rear panel power mode switch to Full or Hi
DO NOT apply any signal to the input during the biasing procedure!
Insert volt meter’s positive probe into the bias test point socket (located underneath the chassis)
Connect volt meter’s negative probe to chassis ground
Switch amp out of standby and allow a few seconds for the circuit to stabilize
Set voltmeter to millivolt scale (or lowest volt scale 60 millivolts =.060 volts.)
Observe the display on the meter to see the current bias setting
If an adjustment is needed, use a small flat blade screwdriver inserted into the bias adjust
pot and adjust by turning bias screw SLOWLY in very small increments until the desired
setting is achieved on the meter. Then wait a few moments for the bias to stabilize and re-
adjust if necessary. You may need to repeat this procedure a couple of times. It is ok to
play test the amp with the meter connected.
Your Amplifier is designed to run 6V6 Type power tubes only.
Below is a limited list of comparable tube types:
6V6: 6V6S, 6V6GT , CV511
Bias Ranges: Are measured and set in Volts. But can be measured and set in milliamps.
Numbers given are for 2 tubes combined.
6V6: .044v to .058v Factory Setting: .052v
Do not set bias higher then recommend levels as it can lead to tube failure or failure within the
amplifier!

We know your new Two-Rock amplifier will provide many hours
of enjoyment and inspiration in the years to come. This manual is
a resource for some of your questions. Please contact us with
any other questions or comments that you may have. We look
forward to hearing from you!
PHONE: [phone]-TONE (8663) (M-F 9am-5pm PST)
ADDRESS: Two-Rock Amplifiers, LLC
619 Martin Avenue, Suite 5
Rohnert Park, CA 94928
CONTACT: [email protected]
WEB: www.two-rock.com
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Two-Rock Amplifiers, LLC
619 MARTIN AVENUE, SUITE 5
ROHNERT PARK, CA 94928
707-584-8663
www.two-rock.com
SERIAL NUMBER: _____________________________
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