Two-Rock Studio Signature User manual

Two-Rock
Studio
Signature
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OWNER’S MANUAL

Dear Customer,
Thank you for your purchase of a Two-Rock amplifier from Two-Rock
Amplifiers, LLC.
As a discerning guitarist, you know the road to great tone begins with
great components.
Our Classic Design, 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.!

Front Panel Functions
1. INPUT: High impedance input to the amplifier. Plug in your instrument here.
2. GAIN: Adjusts the overall gain of the amplifier. Start with this control in the 12 o’clock
position.
3. BRIGHT: Boosts the high frequency response. This is most effective when the input gain is
set at 12 o’clock or lower. The effect is less dramatic as the input gain control is adjusted
past the 12 o’clock position.
4. MID: Boosts the mid range frequency response.
5. DEEP: Boosts the low and low-mid frequencies. This is a low frequency contour switch,
changing the low and low-mid response.
6. TREBLE: Adjusts the high frequency response. 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.
7. MIDDLE: Adjusts the mid-range response. In the full counter-clockwise position, the tone
will be somewhat “scooped” of mid-range response, emphasizing the highs and lows. In
the full clockwise position, mid-range frequencies are allowed to pass to the next gain
stage.
8. BASS: Adjusts the bass response. In the full counter-clockwise position, low frequencies
are cut. In addition, the response of the treble and mid-range controls is greatly reduced.
In the full clockwise position, low frequencies are allowed to pass to the next gain stage.
9. MASTER: Adjusts the output level of the amplifier.
10. REVERB: This is the reverb return control which mixes the reverb effect signal with the dry
signal. At full counterclockwise rotation, the reverb effect is defeated. Using the return
control in conjunction with the reverb drive control on the back, a wide range of natural
reverb effects can be produced.
11. PRESENCE: Adjusts the contour of high-frequency response. The high-frequency
response will increase as you advance the control clockwise.

Rear Panel Functions
1. A/C Input: Connects the amplifier to A/C power via the power cord supplied. Please check
to make sure you have the correct cable for the voltage rating of your country.
2. Fuse: See Fuse Chart
3. Power Switch: Turns power on.
4. 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.
5. Effects Send: Use this jack to send the amplifiers signal to outboard effects.
6. Effects Return: Use this jack to connect the output of your effects to the amplifier.
7. Gain Structure: The 3 position gain structure switch changes the sensitivity and overall feel
of the preamp. In the down position, the amp feels similar to a vintage blackface, the
middle position is much like the Two-Rock Matt Schofield Signature frontend with a hotter
input stage, and the full up position is our traditional Two-Rock frontend.
8. Reverb Send: The reverb drive control determines the amount of signal applied to the
reverb tank. Low settings will create a very open, small room reverb effect with a short
decay time. Advancing the control clockwise increases the signal applied to the driver, and
a very saturated effect with a sharp attack and a long decay can be obtained.
9. 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.

Fuse Chart
*All Fuses are 3AG Type 250 Volt, SLO-BLO
Export 100 Volt
Domestic Fuses 120V
Export 220, 230, 240 Fuses
2A – 35 Watt
2A – 35 Watt
1A-35 Watt
Tube Complement
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 ADJUSTMENT PROCEDURE:
-Power up unit and connect proper speaker load
-DO NOT have an instrument connected to the input during the biasing procedure!
-Take unit off standby and allow a few seconds for the circuit to stabilize.
-Set multi-meter to read DC Volts
-With meter grounded to chassis and + probe inserted into test point, measure voltage.
-Using a small flat head screwdriver, insert into Bias pot and turn slowly adjusting Bias level
This amplifier was built for 6L6WGC short-bottle power tubes.
*Bias ranges are measured and set in volts
*Do not set bias higher then recommend levels as it can lead to tube failure possible damage to other components in the
amplifier!
Factory Bias Setting: .030V
WARNING! No user serviceable parts inside! Refer to qualified service person only.
LINE CORD- For your safety, connect to grounded A/C receptacle only.
V1
V2V3
V4
V5V6
V7
BIAS Pot
TEST POINT
V1 - 12AX7 - Input and Gain
V2 - 12AX7 - Reverb Send & Return
V3 - 12AT7 - Reverb Drive
V4 - 12AX7 - Effects buffer & Mixing Stage
V5 - 12AX7 - Phase Inverter
V6-V7 - 6L6

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!
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PHONE: [phone]-TONE (8663) (M-F 9am-5pm PST)
FAX: [phone]
ADDRESS: Two-Rock
619 Martin Avenue, Suite 5
Rohnert Park, CA 94928
SERVICE: [e-mail]
WEB: www.two-rock.com
PRECAUTIONS:
DO NOT expose to rain or any other moisture.
DO NOT use cleaning solvents. Wipe exterior with a clean, dry
cloth only.
Refer servicing to a qualified service technician.
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Two-Rock
619 MARTIN AVENUE, SUITE 6
ROHNERT PARK, CA 94928
707-584-8663
www.two-rock.com
SERIAL NUMBER: _____________________________
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