Two-Rock ELI 2 User manual

Two-Rock
ELI 1
ELI 2
OWNERS MANUAL

Thank you for your purchase of a Two-Rock Effects
Loop Interface from K&M Analog Designs, 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 and transparent interface for all outboard ef-
fects.
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 product.

Effects Loop Interface Overview
The Two-Rock buffered effects loop interface (ELI) is an effective tool for
the guitarist wishing to utilize a myriad of outboard effects with any guitar
amplifier having preamp output and power amp input jacks. Although not
shown in the interconnect diagrams, the unit can also be used at the front
end (preamp) of any guitar amplifier to buffer the signal fed to the amp.
The buffered interface eliminates the insertion loss of effects chains by
eliminating impedance mismatches created by various outboard effects
units. In addition, compensation for hi frequency signal loss resulting from
multiple effects being daisy-chained as well as long cable runs can be im-
plemented.
Signal Processing
There are 2 main sections to the Effects loop interface. The first stage
consists of a high impedance vacuum tube buffer with a +20dB signal in-
crease capability as well as a high frequency boost via a bright switch if
desired. Signal is then fed to the effects chain.
Signal returning to the unit is processed by a second buffered tube stage
with controllable signal level attenuation and an additional bright switch.
Virtually any combination of effects, even with long cable runs, can ben-
efit from the correct application of this interface. In addition, tone shaping
via EQ and additional gain available can be used to alter or supplement
your sound. Experimentation with signal levels is encouraged as there are
a variety of settings that prove satisfactory.

Bright Switch- The fi rst “BRIGHT” switch enhances hi frequency response on the input(effect
send) side of the buffer.
Effect Input Level-controls the signal level sent to the effect after the buffer stage.
Bright Switch- The second “BRIGHT” switch enhances hi frequency response on the output side
of return buffer.
Effect Output Level-controls the buffered signal level from the effect being sent back to the ampli-
fi er.
Power Switch- Turns power on.
Stand-by Switch- 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 amplifi er. You may leave
the unit “powered up” and place this switch in the “stand-by” position to mute the output.
Indicator Lamp- This lamp will illuminate when the power switch is in the “up” position, indicat-
ing the unit is receiving A/C power.
Mono Front Panel Functions
A/C Input- Connects the amplifi er to A/C power via the power cord supplied. Unless otherwise
specifi ed, your amplifi er is designed to operate on 120 volts A/C, 60 cycles, ONLY.
Fuse- 1 Amp Slo-Blo
OUT TO AMPLIFIER- The buffered effect signal from the unit is sent back to the amplifi er via
this jack. Connect to the “Effects Return” Jack of your amplifi er.
FROM EFFECT- Connect the output of your outboard effect here.
TO EFFECT- This sends a buffered signal to the input of your outboard effects.
INPUT FROM AMP- this is the dry signal input from the amplifi er, generally marked “effects
send” on your guitar amp.
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.
Mono Rear Panel Functions

ELI 1 Interconnect Diagram
Tube Location
V1-12AX7

A/C Input- Connects the amplifi er to A/C power via the power cord supplied. Unless otherwise
specifi ed, your amplifi er is designed to operate on 120 volts A/C, 60 cycles, ONLY.
Fuse- 1 Amp Slo-Blo
OUT TO AMPLIFIER- The buffered effect signal from the unit is sent back to the amplifi er(s) via
these jacks. Connect to the “Effects Return” Jack(s) of your amplifi er(s).
FROM EFFECT- Connect the”Left” and “Right” output of your outboard effect here.
TO EFFECT- This sends a buffered signal to the input of your outboard effects.
INPUT FROM AMP- this is the dry signal input from the amplifi er, generally markd “effects send” on
your guitar amp.
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.
Bright Switch- The fi rst “BRIGHT” switch enhances hi frequency response on the input(effect
send) side of the buffer.
Effect Input Level-controls the signal level sent to the effect after the buffer stage.
Bright Switch- The second “BRIGHT” switch enhances hi frequency response on the output side
of return buffer.
Effect Output Level-controls the buffered signal level from the effect being sent back to the ampli-
fi er. If a stereo effect is used, and both left and right signals are returned to the buffer, the level of
both the left and right signal can be controlled.
Power Switch- Turns power on.
Stand-by Switch- 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 amplifi er. You may leave
the unit “powered up” and place this switch in the “stand-by” position to mute the output.
Indicator Lamp- This lamp will illuminate when the power switch is in the “up” position, indicat-
ing the unit is receiving A/C power.
Stereo Front Panel Functions
Stereo Front Panel Functions

FET
LEAD BYPASS
Stereo Front Panel Functions
ELI 2 (Stereo) Interconnect Diagram
Tube Location
V1-12AX7
V2-12AX7

K&M Analog Designs amplifiers are brought to you by Bill Krinard and Joe Mloganoski.
We know your new Two-Rock amplifier will provide many hours of enjoyment and inspiration in the
years to come. is 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: K&M Analog Designs, LLC
619 Martin Avenue, Suite 6
Rohnert Park, CA 94928
E-MAIL: Joe Mloganoski, Product Specialist
[email protected]
Bill Krinard, Chief Engineer
[email protected]
INTERNET: 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 qulified service technician.

This is a product of
K&M Analog Designs, LLC
619 MARTIN AVENUE, SUITE 6
ROHNERT PARK, CA 94928
707-584-8663
www.two-rock.com
SERIAL NUMBER:_____________________________