K&M Analog Designs Two-Rock Onyx User manual

O n y x
INPUT
PRESENCE
Two-Rock
Two-Rock
Owner's Manual

Page 1
Thank you for your purchase of a
Two-Rock amplifier 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 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 a Two-Rock amplifier.

FRONT PANEL FUNCTIONS
1. INPUT JACK- High impedance input to the amplifier. Plug in your
instrument here.
THERE ARE 2 ROWS OF CONTROLS. THE TOP ROW AFFECTS ONLY THE CLEAN
CHANNEL. THE BOTTOM ROW IS IDENTICAL TO THE TOP ROW. THE BOTTOM ROW
AFFECTS ONLY THE LEAD CHANNEL.
2/9. 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.
3/10. MIDDLE 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.
4/11. 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.
5/12. GAIN- ADJUSTS- the overall gain of the channel selected. Start with this
control in the 12 o'clock position on the clean channel(5), and 8 or 9 o'clock
on the lead channel(12).
6/13. MASTER - Adjusts the output level of clean channel(6) and the lead
channel (13 )
Page 2
Two-Rock
Onyx
MIDDLE BASS REVERB PRESENCEGAIN MASTER
INPUT
TREBLE
STANDBY
1 2 3 4 5 6 7 8
9
10
11
12
13
14
16
17
15
LEAD
ON

7/14 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. The reverb levels are completely independent.
8/15. PRESENCE CONTROL- Adjusts the contour of high-frequency
response. The high-frequency response will increase as you advance the
control 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. 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. POWER SWITCH- Turns the power on.
5. SPEAKER OUTPUT JACKS- There are 3 speaker output jacks- 4,8 and 16 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.
6 FOOTSWITCH JACK- Connect the foot switch assembly here to enable
remote switching of the lead/rhythm and bypass functions.
7. EFFECTS SEND- Use this jack to send the amplifiers signal to outboard effects.
8. EFFECTS RETURN- Use this jack to connect the output of your effects to the
amplifier.
9. 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.
10. LEAD/RHYTHM SWITCH- Selects either the clean or lead channel when
footswitch is not in use. This switch must be left in the "down" (rhythm)
position to enable footswitch function.
11."SOLO" OR "BOOST" LEVEL- Adjusts the amount of boost for either
channel when the boost function is selected from the footswitch.
This feature allows 2 seperate levels for each channel, allowing the user to
dial in just the right amount of volume increase for soloing, etc.
Page 4
Two-Rock, CA
1 2 3 4
5
6
7 8
9
A/C120VOLTS
60CYCLES
GROUND
FUSE
2.5AMP
SLO-BLO
SPEAKER OUTPUTS
4OHM 16OHM SEND RETURN
LEVEL
EFFECTS LOOP
K&M Analog Designs
Manufacturedby:
MADE IN U.S.A.
S/N
FOOTSWITCH
8OHM
POWER
Two-Rock, CA
LEAD
RHYTHM
10
11

FOOT SWITCH
TUBE COMPLEMENT
V1- 12AX7, Rhythm channel
V2- 12AX7, Lead channel
V3- 5751/12AT7, Reverb driver
V4- 12AX7, Reverb / effects
V5- 12AX7, Phase inverter
V6, V7- 7581, Output
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) Boost
(Red LED)
Front
Rear
V1
V3
V2
V4
V5
V6
V7
The Tube Location

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
7880 Old Redwood Highway
Cotati, CA 94931
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 qualified service technician.
Page 6

This is a product of
K & M Analog Designs
7880 Old Redwood Highway
Cotati, CA 94931
Serial Number:___________