K&M Analog Designs Two-Rock Topaz User manual

INPUT
PRESENCE
Two-Rock
Two-Rock
Topaz
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.
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. 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. 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. MID SWITCH- Boost the mid range frequency response.
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.
8. CLEAN CHANNEL MASTER VOLUME- Adjusts the output level of the clean
channel.
9. 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.
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Two-Rock
Topaz
MIDDLE BASS
MID
DEEP
BRIGHT
2 ROCK
LEAD
RHYTHM
BYPASS
GAIN LEAD REVERB PRESENCE
MASTER
LEAD
GAIN MASTERINPUT TREBLE
HI-FI
STANDBY POWER
1 2 3 4 5
6
7 8 9
10
11 12 13
14
15 16 17 18 19

10. 2ROCK/HI-FI- This switch allows you to choose between 2 completely
different equalization setting. HI-FI is a lower gain setting, with extended
midrange and bass available when used in conjunction with the middle and
bass controls as well as the deep switch. This setting is suitable for any style
requiring a pure clean tone with a nice round bottom and plenty of
headroom.
2ROCK is a higher gain setting , allowing a greater signal level to pass to the
lead channel. This setting is suitable for any style requiring a clean to
slightly distorted tone in clean mode , and more gain in the lead mode.
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. 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.
14. BYPASS SWITCH- This switch bypasses the tone controls, increasing both
level and mid-range response.To enable foot switch control of this function,
switch must be in the down position.
15. 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.
16. PRESENCE CONTROL- Adjusts the contour of high-frequency
response. The high-frequency response will increase as you advance the
control clockwise.
17. 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.
18. POWER SWITCH- Turns the power on.
19. 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- 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. SERIES/PARALLEL SWITCH- The effects loop can be switched between
series and parallel modes. With the switch in the down position, theloop is in
parallel mode. The effects level control becomes a blend control for mixing in
the desired amount of outboard effects. Since the onboard spring reverb is
part of the parallel loop, this control will also recommended basic setting for
this control is between the 8 and 10 o'clock positions.
With the toggle in the up position, the loop is in series mode. The effects
level control becomes the effects level return control. Because all of the
amp's signal passes through the loop, the level control becomes a master
volume. At the fully counter-clockwise position, np signal is fed to the
output section.
The series mode is useful for delayed echo, slapback, or other effect when
no dry signal is desired.
It is recommended that other outboard effects such as chorus, digital reverb,
etc. be run in the fully "wet" position and blended in to the desired level
( via the effects level control) in parallel mode. This will have the least
amount of effect on the dry signal and overall tone quality.
Page 4
A/C120VOLTS
60CYCLES
GROUND
FUSE
2.5AMP
SLO-BLO
SPEAKER OUTPUTS
4OHM 8OHM
MODE
SERIES
PARALLEL SEND RETURN
LEVEL
EFFECTS LOOP
200WATTS
K&M Analog Designs
Two-Rock, CA
CAUTION: To reduce the risk of electrical shock, do not remove chassis. No
user serviceable parts inside. Refer service to qualified personnel.
Manufacturedby:
MADE IN U.S.A. S/N
FOOTSWITCH HERMONICS
1 2 3
4
5
6
7 8 9 10

7. EFFECTS RETURN- Use this jack to connect the output of your effects to the
amplifier.
8. 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.
9. FOOTSWITCH JACK- Connect the foot switch assembly here to enable
remote switching of the lead/rhythm and bypass functions
10. HARMONICS - This switch defeats the internal feedback circuit located in
the preamp section. The effect is subtle; you will notice a slight increase in
high and low frequency response and a decrease in dimensionality and
articulation.
NOTE: Both the “Lead” and “Bypass” front panel switches must be
in the “down” position to enable footswitch function.
Page 5

FOOT SWITCH
TUBE COMPLEMENT
V1- 12AX7, Rhythm channel
V2- 12AX7, Lead channel
V3- 5751, Reverb driver
V4- 12AX7, Reverb / effects
V5- 12AX7, Phase inverter
V6, V9- 7581, Output
V7, V8- 7581, 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 6
Lead
(Blue LED) Bypass
(Red LED)

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: Tal Morris, Sales Manager
[email protected]
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 7

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