Two-Rock Traditional Clean User manual

OWNER'S MANUAL

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, 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."
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
INPUT JACK - High impedance input to the amplifier. Plug in your instrument here.
BRIGHT Switch - Boosts the high frequency response. This is most effective when the
Gain control is set at 12 o’clock or lower. This is great for adding sparkle to clean tones.
The effect is less dramatic as the Gain control is adjusted past the 12 o’clock position.
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.
MID Switch - Boosts the midrange frequency response.
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.
DEEP Switch - Boosts the lower bass frequencies. This low frequency contour switch also shifts the
emphasis from the upper bass frequencies to the lower bass frequencies which helps smooth out
and clarify the midrange response.
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.
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. Keep in mind that the amount of gain set here also
determines the signal level feeding the lead channel. Lower settings of this control will reduce the
available signal level in the lead channel so higher settings of lead gain may be required to achieve
the desired amount of overdrive when in the lead channel mode.

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.
REVERB SEND - The reverb send control determines the amount of signal applied to the reverb
tank. Low settings will create short decay times. Advancing the control clockwise increases the
signal applied to the tank for longer decay times. Use this control in conjunction with the REVERB
control.
REVERB RETURN - 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. Use this return control in
conjunction with the reverb drive control, located on the rear panel, to create a wide range of natural
reverb effects.
PRESENCE - Adjusts the contour of the high-frequency response. Turning this control up gradually
increases the intensity of the upper frequencies. This is a subtle control which can be used to either
emphasize sparkle and brightness when needed or smooth out your overall tone by turning the
control down.
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.
INDICATOR LAMP - This lamp will illuminate when the rear panel power switch is in the “up”
position, indicating the unit is receiving A/C power.

Rear Panel Functions
A/C Input - Connects the amplifier to A/C power via the power cable supplied. Unless otherwise
specified, your amplifier is designed to operate on 120 volts A/C, 60 cycles.
FUSE - See Fuse Chart
AC ON/OFF - Turns power on or off.
HIGH/LOW Power Switch - On 100/50w and 40/20w models the up position is full power, and the
down position is half power. The 100/50w and 40/20w proprietary output transformers, when
switching from full power to half power, will automatically compensate for impedance differences so
no impedance adjustment is necessary. On the 50w model the up position is fixed bias, and the
down position is cathode bias. The cathode bias setting lowers the amp’s clean headroom and
power, enhances touch sensitivity but does not create a significant perceivable volume difference.
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 speaker cabinet with the impedance (output) of the
amplifier.
Effects Loop –
The effects loop on this amplifier is a passive type of loop, see FAQ on two-rock.com
Send - Use this jack to send the amplifier’s signal to the effects that you want to use in the loop.
The Master volume controls how much signal is output to the send jack.
Return - Use this jack to connect the output from the effects in the loop back to the amplifier.
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
Fuses:
Domestic Fuses:
Export 220, 230, 240
3.5 - 100 Watt 4x6L6
3.25 - 100 Watt 4x6L6
1.6 - 100 Watt 4x6L6
2.8 - 50 Watt 2x6L6
2.5 - 50 Watt 2x6L6
1.25 - 50 Watt 2x6L6
TUBE COMPLIMENT
Each fine production tube is tested and matched to our exacting specifications. When the time comes that the
power tubes need replacing, it’s very important to use high quality, matched sets of power tubes. It’s also critical
that the bias of the amp be reset after installing new, or NOS power tubes. External bias adjustment and test
points are located on the bottom of the chassis near the output tube sockets. A digital voltmeter and small
screwdriver are required for bias adjustment.
V1 - Preamp 12AX7
V2 - Reverb send, reverb return 12AX7
V3 - Reverb drive 12AT7
V4 - Reverb /clean mix12AX7
V5 - Phase inverter 12AX7
V6, V7 - Output 6L6GC, (100 Watt) / 6V6GT (40 Watt)
V8, V9 - Output 6L6GC, (100 Watt) / 6V6GT (40 Watt)
V1V2V3V4V5
V6V7
TEST POINT
BIAS ADJUST
V7V7

IMPORTANT: BIAS NOTE FOR AMPLIFIERS!
These amps are biased differently than some other models.
Please check proper bias settings for your wattage.
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
• 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.
A setting of 0.030 to 0.032 volts is normal for 50 and 100 Watt amplifiers with (2) or (4) 6L6’s
A setting of 0.020 to 0.022 volts is normal for 40 watt amplifiers with (4) 6V6’s
Settings higher than the recommendation can cause premature tube wear and possibly damage to
the amplifier.
WARNING! No user serviceable parts inside! Refer to qualified service person only.
A/C LINE CABLE - For your safety, connect to grounded A/C receptacle only.

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)
ADDRESS: Two-Rock Amplifiers, LLC
619 Martin Avenue, Suite 5
Rohnert Park, CA 94928
CONTACT: [e-mail]
WEB: www.two-rock.com

619 MARTIN AVENUE, SUITE 5
ROHNERT PARK, CA 94928
707-584-8663
www.two-rock.com
SERIAL NUMBER: