Two-Rock Joey Landreth Signature User manual

Two-Rock
Joey Landreth
Signature
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.
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 - 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.
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.

HARMONIC TREMOLO - Unlike the bias tremolo which modulates the output volume, harmonic
tremolo modulates higher and lower frequencies separately at the same rate, but offset in phase
from one another. There is no actual change in overall volume or pitch, but the faux doppler-effect
created by the phase-shifting between high and low frequencies makes it sound like a mixture of
both. It is a very cool sound, and is entirely tube driven requiring three-and-a-half preamp tubes to
create this circuit. The addition of both tremolos, that can be used simultaneously or
independently, offers the player a myriad of tonal options.
SPEED –Adjusts the speed of the harmonic tremolo.
INTENSITY –Adjusts the effect and depth of the harmonic tremolo.
BIAS TREMOLO - Modulates the bias voltage of the amp’s power tubes. This produces a very
musical effect that does not get in the way of your playing even at higher settings of intensity.
SPEED –Adjusts the speed of the bias tremolo.
INTENSITY –Adjusts the effect and depth of the bias tremolo.
REVERB RETURN - The reverb return control mixes the reverb effect signal with the dry signal. At
full counterclockwise rotation, the reverb effect is defeated. By using the return control in
conjunction with the reverb send control, a wide range of natural reverb effects can be produced.
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.
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.
NOTE: All switches are ON when in the “up” position

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
POWER SWITCH -Turns power on.
HIGH/LOW SWITCH - HIGH power mode is 100 watts, LOW power mode is 50 watts.
The 100/50w proprietary output transformer, when switching from full power to half power, will
automatically compensate for impedance differences so no impedance adjustment is necessary.
Speaker Output Jacks - There are 3 speaker output jacks; 4, 8, and 16 ohms.
Be sure to match the impedance of your speaker cabinet with the impedance (output) of the
amplifier.
NEVER OPERATE YOUR AMPLIFIER WITHOUT A PROPER SPEAKER LOAD CONNECTED.
Effects Loop –
The effects loop on this amplifier is a passive type of loop, see FAQ on two-rock.com
Effects Send - Use this jack to send the amplifier’s signal to outboard effects.
Effects Return - Use this jack to connect the output of your effects to the amplifier.
REVERB SEND - This 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.
FOOTSWITCH - The footswitch connects here. Both the Harmonic Tremolo and the Bias Tremolo
can be activated via the footswitch. The respective front panel switches must be in the “off,” or
down position, to enable the footswitch functions.
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.

FOOTSWITCH –includes ¼” to ¼” TRS cable
HARMONIC TREMOLO - Blue LED
BIAS TREMOLO. - Red LED
FUSE CHART
All Fuses are 3AG Type 250 Volt, SLO-BLO
Export 100V Domestic 120V Export 220V, 230V, 240V
3.2A - 100 Watt 4x6L6 3.2A - 100 Watt 4x6L6 2.5A - 100 Watt 4x6L6
TUBE COMPLEMENT
V1- Preamp 12AX7
V2- Reverb Send, Reverb Return 12AT7
V3- Reverb Mix, Harmonic Trem Input 12AX7
V4- Harmonic Trem Oscillator 12AX7
V5- Bias Trem Oscillator 12AX7
V6- Harmonic Trem 12AX7
V7- Phase Splitter 12AX7
V8-V11 –6L6GC Output (100 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 PROCEDURE:
1. Make sure the speaker is connected properly, then power up the amplifier.
2. Set the power mode switch to Hi or Full up position
3. DO NOT apply any signal to the input during the biasing procedure!
4. Insert the volt meter’s positive probe into the bias test point socket
5. Connect the volt meter’s negative probe to chassis ground
6. Switch the amp out of standby and allow a few seconds for the circuit to stabilize.
7. Set the voltmeter to millivolt scale (or lowest volt scale 60 millivolts =.060 volts.)
8. Observe the display on the meter to see the current bias setting.
A setting of 0.030 to 0.032 volts is normal for 100 watt amplifiers with (4) 6L6’s.

If an adjustment is needed, use a small flat blade screwdriver inserted into the bias adjust pot
and adjust by turning the 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.
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

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