Two-Rock Two-Rock Matt Schofield Signature User manual

OWNERS MANUAL

Dear Customer,
Thank you for your purchase of a amplifier from Premier Builders
Guild.
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 amplifier.
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 Jack- High impedance input to the amplifier. Plug in your instrument here.
2. Treble Control- 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.
3. Bright Switch- 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. Middle Control- 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.
5. Mid Switch- Boosts the mid range frequency response.
6. Bass Control- 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.
7. Deep Switch- Boosts the low and low-mid frequencies. This is a low frequency contour switch,
changing the low and low-mid response.
8. Gain- Adjusts the overall gain of the amplifier. Start with this control in the 12 o’clock
position.
9. Boost Switch- When engaged the EQ section is passively bypassed boosting the natural high
and mid frequencies of the guitar. It also increases the amount of input signal that drives the gain
stage.
(Option is foot-switchable)
10. Master- Adjusts the output level of the amplifier.
11. Presence Control- Adjusts the contour of high-frequency response. The high-frequency
response will increase as you advance the control clockwise.

12. 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.
13. Reverb return- The reverb return control 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, a wide range of natural reverb effects can be produced.
14. Tremolo Speed- Adjusts the rate of the tremolo circuit.
15. Tremolo Intensity- Adjusts the amount of tremolo that is being created.
(Feature is Foot-switchable)
16. Tremolo Switch- This switch engages the tremolo circuit.
17.Indicator Lamp- This lamp will illuminate when the power switch is in the “up” position,
indicating the unit is receiving A/C power.
NOTE: All switches are ON in the “up” position (except reverb switch, see description
Rear Panel Functions
1. 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.
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. Footswitch Jack- The footswitch connects here. The boost and tremolo features can be turned
off and off through here.
6. Effects Send- Use this jack to send the amplifiers signal to outboard effects.

7. Effects Return- Use this jack to connect the output of your effects to the amplifier.
8. Traditional / Modern- This switch affects the internal negative feedback circuit located in the
preamp section.
The effect is subtle and becomes more apparent as you familiarize yourself with various settings.
“The Modern settings is our standard Two-rock negative feedback circuit, it is most effective when
using high output humbucking or active pickups. This setting will also smooth out the drive of the
signal as it passes through the stage onto the rest of the amplifier. The Traditional setting
completely takes the negative feedback out of the input stage. Guitars with single coil or low
wound pickups will have more punch with this setting. The setting will cause more drive to be
present in the signal. We suggest you experiment with the settings of both. You can change the
degree of articulation, compression, and “bloom” characteristics of the amp with these features.
Fuse Chart
All Fuses are 3AG Type 250 Volt, SLO-BLO
Export 100 Volt Domestic Fuses: Export 220, 230, 240 Fuses:
2A –22/35 Watt 2A –22/35 Watt 1A-22/35 Watt
2.5 - 50 Watt 2.5 - 50 Watt 1.6 - 50 Watt
3.2 - 100 Watt 3.2 - 100 Watt 2.5 - 100 Watt
FOOTSWITCH
Boost - Blue LED
Tremolo - Red LED

(Tube Complement)
V1- Preamp 12AX7
V2- Reverb return, Mixing Stage 12AX7
V3- Reverb drive 12AT7
V4- Tremolo 12AX7
V5- Phase inverter 12AX7
V6, V7- SED Winged “C” 6L6, Output
V8, V9- 5AR4 Tube rectifier
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
voltmeter 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
It is recommended to only use exact replacement tubes similar to what is installed at the factory.
Be careful when deciding to install other types of 6L6, 6V6, or EL-34 based tubes. Not all have the
same specs and some can’t handle the plate voltage of the amplifier.
Below is a limited list of comparable tube types :
6L6: 6L6GC, 7581, 5881
6V6: 6V6S, 6V6GT
EL-34: 6CA7

Bias Ranges: Are measured and set in Volts. But can be measured and set in milliamps.
Numbers given are for 2 or 4 tubes combined.
6L6 and EL-34 type tubes: .060V to .070V for 35watt and 50watt Factory Setting: .064V
.1200V to .1400V for 100watt Factory Setting: .1260V
6V6: Installed in the 22watt versions only: .044V to .058V Factory Setting: .054V
6V6: Installed in 22watt versions with tremolo, bias must not be set higher then .044V as it will
cause tube failure.
Do not set bias higher then recommend levels as it can lead to tube failure or failure within the
amplifier!
WARNING! No user serviceable parts inside! Refer to qualified service person only.
LINE CORD- For your safety, connect to grounded A/C receptacle only.
amplifiers are brought to you by Premier Builders Guild.
We know your new 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)
FAX: [phone]
ADDRESS: Two-Rock
619 Martin Avenue, Suite 6
Rohnert Park, CA 94928
SERVICE: [email protected]
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.
This is a product of
Premier Builders Guild
619 MARTIN AVENUE, SUITE 6
ROHNERT PARK, CA 94928
707-584-8663
www.two-rock.com
SERIAL NUMBER: ____________________________