Two-Rock Emerald 50 User manual

Two-RockTwo-Rock
EmeraldEmerald 5050
AmethystAmethyst 5050
SapphireSapphire 100100
Owner’s Manual

Page 1
Thank you for your purchase of a
Two-RockTwo-Rock amplifier from K & M Analog DesignsK & M Analog Designs..
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 you may have.
We extend a warm welcome to you as a
member of a select group of musicians who have
chosen aTwo-Rock amplifier.

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. MID-RANGE 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.
4. 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.
5. 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.
6. DEEP SWITCH- Boosts the low and low-mid frequencies. This is a
low frequency contour switch, changing the low and low-mid response.
7. INPUT GAIN- Adjusts the overall gain of the amplifier. Start with this
control in the 12 o’clock position. Keep in mind that the amount of gain
set here determines the signal level feeding the lead channel. Low gain
settings of this control will require higher lead gain settings for the same
amount of overdrive.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
Page 2

8. CLEAN CHANNEL MASTER VOLUME- Adjusts the output level of
the clean channel.
9. LEAD CHANNEL SWITCH- Sends the instrument signal through the
lead circuit, adding extra stages of gain to the signal and enabling the
lead gain and lead master controls. To enable foot switch control of this
function, switch must be in the down position.
10. BYPASS SWITCH- Increases the mid-range response. To enable foot
switch control of this function, switch must be in the down position.
11. LEAD GAIN- Adjusts the input level (gain) of the lead channel. At
lower settings, a slightly overdriven tone can be achieved. As the control
is adjusted clockwise, the overdrive effect increases.
12. LEAD MASTER- Adjusts the output level of the lead channel.
13. DWELL SWITCH- Defeats an internal feedback circuit. The effect is
subtle; you will notice a slight increase in high-frequency response and a
decrease in dimensionality and articulation.
14. REVERB- Mixes the dry signal with a high quality spring-type
reverberation effect. This effect is defeated with the control in the full
counter-clockwise position.
15. PRESENCE CONTROL- Adjusts the contour of high-frequency
response. The high-frequency response will increase as you advance the
control counter-clockwise.
16. 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 amplifier. You may leave the unit
“powered up” and place this switch in the “stand-by” position to mute the
output.
17. POWER SWITCH- Turns the power on.
18. 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.
Page 3

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- 3 AG Type, slow blow fuse. Refer to the legend below the fuse
holder for the proper fuse rating for your amplifier. (50 watt-2.5 amp /
100 watt-3.5 amp)
3. GROUND SWITCH- Normally left in the center (Off) position. If you
encounter excessive A/C hum or ground loop noise, try the switch in the
other 2 positions.
4. SPEAKER OUTPUT JACKS- There are 3 speaker output jacks- 2, 4,
and 8 ohm. 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. EFFECTS SEND- Use this jack to send the amplifiers signal to
outboard effects.
6. EFFECTS RETURN- Use this jack to connect the output of your
effects to the amplifier.
7. EFFECTS LEVEL- Adjusts the return signal level. It also acts as a
master volume control. Do not set fully counter-clockwise, as this will
shut off signal to the output section, resulting in no output level.
Normally this control should be set at the 12 o’clock position.
8. FOOTSWITCH JACK- Connect the foot switch assembly here to
enable remote switching of the lead/rhythm and bypass functions.
NOTE: Both the “Lead” and “Bypass” front panel switches must be in
the “down” position to enable footswitch function.
Page 4
1
2
3
4
5
6
7
8

FOOT SWITCH
TUBE COMPLEMENT
V1- 12AX7, Rhythm channel
V2- 12AX7, Lead channel
V3- 12AT7, Reverb driver
V4- 12AX7, Reverb / effects
V5- 12AX7, Phase inverter
V6, V7- 6L6, Output
V8, V9- 6L6, Output (100 Watt only)
Tubes are numbered from right to left as you face the rear of the amp.
Each fine production tube is tested and matched to our exacting
specifications. Individual bias controls are provided for each output, as well
as phase-balance adjustment. This ensures maximum tube life, power, and
performance.
NOTE: Please do not attempt to adjust tube bias or phase balance. Refer
service to qualified service person only.
LINE CORD- For your safety, connect to grounded A/C receptacle only.
Page 5
Lead
(Blue LED)
Bypass
(Red LED)

GETTING STARTED
This is designed to be a simple guide. You will, most
likely, find your own “sweet spots”. Pictured here are
some examples of sample settings, including key points to
keep in mind.
The input gain (clean channel) will affect the overall gain of the lead channel
because the clean signal is fed directly into the lead circuit. For example,
low settings of the input gain will keep the clean channel “clean” and require
a much higher lead gain setting to put that channel into overdrive.
Conversely, setting the input gain control past the 2 o’clock position will
send a much hotter signal to the lead channel, requiring a lower setting for
the same level of overdrive.
EXAMPLE 1
These settings will give you a clean, fendery rhythm sound and a slightly
edgy lead tone. Switching to bypass in rhythm will boost the mids and make
it a little honky, but still clean. Bypass in lead will add crunch and mid-
boost.
Page 6

EXAMPLE 2
These settings will give you a more mid-boosted, gainier tone in both rhythm
and lead modes.
EXAMPLE 3
These settings will give you a high-gain clean channel that will be very
sensitive to the players touch, especially with humbuckers. Playing hard
will make the clean channel distort at these levels. In lead this is a fairly
high-gain setting and going into bypass will really make the amp sing. For
added clarity and harmonics, open the feedback loop (dwell switch) and
enjoy the beautiful, rich overtones.
Page 7

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.
This manual is a resource for some of your questions.
Please contact us with any other questions or comments
you may have. We look forward to hearing from you!
PHONE: [phone] (M-F 9am – 5pm PST)
FAX: [phone]
MAILING ADDRESS: K & M Analog Designs
2249 Schaeffer Road
Sebastopol, CA 95472
E-MAIL: Joe Mloganoski, Product Specialist
[email protected]
Bill Krinard, Chief Engineer
[email protected]
INTERNET: www.two-rock.com
Page 8
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
K & M Analog DesignsK & M Analog Designs
2249 Schaeffer Road
Sebastopol, CA 95472
Serial Number:___________