Two-Rock Silver Sterling Signature User manual

Two-Rock
Silver Sterling
Signature
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OWNER'S MANUAL

Dear Customer,
Thank you for your purchase of a Two-Rock!
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. FET GAIN - The FET (Field Effect Transistor) feature consists of a single stage high
impedance preamp/buffer. This feature can be switched in and out via the front panel
switch (“ON” is “up” position) or footswitch. This mode offers an additional buffered gain
stage, and can be used to buffer the input from high output pickups or increase the signal of
low output pickups. The FET GAIN control controls the amount of signal fed to the following
stage(s) {gain control}
3. FET Switch - Enables or defeats the FET feature. (“ON” is “up” position)
4. GAIN - Adjusts the overall gain of the amplifier. Start with this control in the 12 o’clock
position.
5. EQ1/EQ2 - This switch allows you to choose between 2 completely different equalization
settings. EQ1 is a lower gain setting, with extended midrange and bass available when
used in conjunction with the middle and bass controls as well as the deep switch. This
setting is suitable for any style requiring a pure clean tone with a nice round bottom and
plenty of headroom. EQ2 is a higher gain setting.
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. 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.
8. 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.
9. MID - Boosts the mid-range frequency response.
10. 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.
11. DEEP - Boosts the low and low-mid frequencies. This is a low frequency contour switch,
changing the low and low-mid response.

12. BYPASS - This switch bypasses the tone controls, increasing both level and mid-range
response. To enable footswitch control of this function, switch must be in the down
position.
13. HIGH/LOW Filter - The treble and bass cut controls are 7 position switches, offering more
tone shaping(EQ adjustment) if desired.
• NOTE - With the treble cut control in the full counter-clockwise position, BOTH
controls are disabled. Turning the TREBLE CUT control clockwise reduces high
frequency response. Turning the BASS CUT control clockwise reduces the bass
response.
14. 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.
15. 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.
16. MASTER - Adjusts the output level of the amplifier.
17. PRESENCE - Adjusts the contour of high-frequency response. The high-frequency
response will increase as you advance the control clockwise.
18. STAND-BY - Should be in the “down” or “stand-by” position when you apply power to the
unit. After a few seconds, place the switch in the “up” position to use the amplifier. You
may leave the unit “powered up” and place this switch in the “stand-by” position to mute the
output.
19. 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

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,
ONLY. LINE CORD: For your safety, connect to grounded A/C receptacle only.
2. FUSE - See Fuse Chart
3. POWER -Turns power on.
4. HIGH/LOW - On 100 watt (4x6L6) models, the HIGH power mode is100 watts, the LOW
power mode is 50 watts. On 150 watt (4x6550) models, the HIGH power mode is150 watts,
the LOW power mode is 75 watts. With these output transformers, when switching power
settings, the output transformer will compensate for impedance differences so you will not
have to change impedance.
5. SPEAKER OUTPUT - 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.
6. FOOTSWITCH - The footswitch connects here. The FET function and tone BYPASS
functions can be activated via the footswitch. The respective front panel switches (FET and
bypass) must be in the “off,” or down position, to enable the footswitch functions.
7. EFFECTS SEND - Use this jack to send the amplifiers signal to outboard effects. This
SEND is a passive effects output.
8. EFFECTS RETURN - Use this jack to connect the output of your effects to the amplifier.
This RETURN input is a passive input.
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: Export 220, 230, 240
Fuses:
3.2 - 100 Watt 4x6L6 3.2 - 100 Watt 4x6L6 2.5 - 100 Watt 4x6L6
4 - 150 Watt 4x6550 4 - 150 Watt 4x6550 2.5 - 150 Watt 4x6550
FOOTSWITCH
FET - Blue LED
BYPASS - Red LED
TUBE COMPLIMENT
V1- Preamp 12AX7
V2- Reverb Drive 12AT7
V3- Reverb Mix 12AX7
V4- Reverb Return, Reverb Send Gain 12AX7
V5- Phase Inverter 12AX7
V6- Cathode follower 12AX7WA (Use proper
cathode follower tube. See Two-Rock for
recommendation)
V7-V10 - 6L6WGC, Output (100 Watt) ; 6550, Output (150 Watt)
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 ADJUSTMENTS:
1. Power up unit and connect proper speaker load.
2. Set master volumes and effects return controls to zero.
3. DO NOT apply any signal to the input during the biasing procedure!
4. Take unit off standby and allow a few seconds for the circuit to stabilize.
5. Set voltmeter to Millivolt scale (or lowest volt scale 60 millivolts=.060 volts.)
6. With meter grounded to chassis and + probe at test point, measure voltage. A reading of
0.030 to 0.032 volts is normal for 100 Watt amplifiers with (4) 6L6’s.
7. A reading of 0.034 to 0.036 volts is normal for 150 Watt amplifiers with (4) 6550’s.
8. If not in this range, adjust by turning bias screw SLOWLY a small amount. Do not set
above .035!
Settings higher than recommended may cause premature tube wear and possibly damage the amplifier.
Keep in mind that tubes vary in quality, and some tubes can handle varying mA. If you’re not sure, ask a technician or contact
Two-Rock.
WARNING! No user serviceable parts inside! Refer to qualified service person only.

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 6
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.

Two-Rock
619 MARTIN AVENUE, SUITE 6
ROHNERT PARK, CA 94928
707-584-8663
www.two-rock.com
SERIAL NUMBER: _____________________________
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