Randall RM80 Owner's Manual
AMPLIFIERS
RM50/RM80
MODULAR TUBE COMBOS
OWNERS MANUAL
Dear Randall Owner,
Congratulations on the purchase of your new Randall Amplifier, and thank you for the support of our product line. Randall amps are made
to strict quality and consistent performance standards, that will provide you with years of musical satisfaction. Please read the following
manual, before operating your new Modular amplifier. The innovation of the new MTS series, will take tube versatility to new heights, and
your journey begins today. The quick start guide should help get you going, but if you ever have any questions or comments, please contact
us anytime.
Enjoy your new purchase!
Warnings:
-Do not block any ventilation openings on the sides or rear of the preamp. Always give four inches of proper ventilation to the rear of the
preamp.
-Do not expose the amplifier to rain, moisture, dripping or splashing water. Do not place objects filled with liquids on or nearby the amplifier.
-Do not expose the amplifier to direct sunlight or extremely high temperatures. Always unplug the AC power cord before changing fuses or
tubes. When replacing fuses, use only the same type and rating.
-Be sure to connect to an AC power supply that meets the power supply that meets the power supply specification, listed on the rear fuse
holder.
-If there is any danger of lightning occurring nearby, remove the power plug from the wall socket in advance.
-Do not use excessive force in handling control buttons, switches and controls. Do not use solvents to clean the unit, wipe off the exterior
with soft cloth.
WARNINGS AND SYMBOLS:
LIGHTNING FLASH: The lightning flash with
an arrowhead within an equalateral triangle, is
intended to alert the user of the presence of
uninsulated DANGEROUS VOLTAGE within
the product’s enclosure that may be of
significant magnitude to constitute risk of
electric shock to persons.
IMPORTANT SAFEGUARDS
THESE WARNINGSAPPLY TOALL RANDALL ELECTRONIC PRODUCTS. PLEASE READAND OBSERVEALL
WARNINGSAND INSTRUCTIONS CONTAINED IN THIS SERVICE MANUAL AND THOSE ONYOUR RANDALL
PRODUCT PRIOR TO ITS USE.
PRECAUTIONAR Y WARNING:
RAIN AND MOISTURE: To reduce the risk of
fire or electric shock, DO NOT EXPOSE THIS
UNIT TO RAIN OR MOISTURE. Operators of
electronic products should in no way be in
contact with water.
WARNINGS AND SYMBOLS:
LIGHTNING FLASH: The lightning flash with
an arrowhead within an equalateral triangle, is
intended to alert the user of the presence of
uninsulated DANGEROUS VOLTAGE within
the product’s enclosure that may be of
significant magnitude to constitute risk of
electric shock to persons.
IMPORTANT SAFEGUARDS
THESE WARNINGSAPPLY TOALL RANDALL ELECTRONIC PRODUCTS. PLEASE READAND OBSERVEALL
WARNINGSAND INSTRUCTIONS CONTAINED IN THIS SERVICE MANUAL AND THOSE ONYOUR RANDALL
PRODUCT PRIOR TO ITS USE.
PRECAUTIONAR Y WARNING:
RAIN AND MOISTURE: To reduce the risk of
fire or electric shock, DO NOT EXPOSE THIS
UNIT TO RAIN OR MOISTURE. Operators of
electronic products should in no way be in
contact with water.
Replacing modules: When exchanging modules, simply turn
both thumbscrews to the left until they fill loose.(Do not
remove the screw completely). Remove the module pulling
out on the thumbscrews. Slide in a new module, and push in
on the center knobs until flush with the front panel. Tighten
the thumbscrews, by turning to the right until snug.
Quick start guide:
Hooking up your gear:
After plugging in the AC power cord, connect a 1/4” instrument cable from the pre or post loop output to the input of your power amp. If
your using your effects loop, use only the post loop output. If you have the foot controller(optional), connect the foot controller to the
MIDI In on the rear panel. After turning on the unit, plug your guitar into the front panel input. Select the desired preamp module, and
adjust each level to 12 o’clock to start. Slowly bring up the master level until your reach the desired volume level. Then adjust the EQ settings on the module to your desired setting. Select the next module and repeat this process.
Channel Switching:
If there are four preamps installed, pressing & releasing the channel select switch will change the channel from 1 to 2, pressing &
releasing again 2 to 3, and again 3 to 4.
Saving a Preset:
Pressing and holding the channel select switch for 2 seconds will store your current settings. When used with the foot controller, select
button 1 on the foot controller, then set to channel 1 using the front panel channel switch button. (both the footswitch and channel 1 light
should be lit). Press and hold the channel select switch for 2 seconds, and this will store your current settings with the footswitch. The
footswitch will not select any preferred channel. To reset, simply turn the preamp off/on, and repeat the above steps.
Front panel Features and controls:
The RM50/RM80 front panel consists of 1/4” input, channel switch, effects level, Master level, Density & Presence controls. Read below
for descriptions of each.
Input Jack: The main guitar input. Using a high quality instrument cable connect your guitar to this input.
Channel switching: Each module can be changed by either pressing the front panel button, or with the included footswitch. Simply press
and release the front panel button to change modules. When using the footswitch plug in the footswitch, and press the one.
Front panel Effects level: This knob controls the amount of effects when used with the parallel effects loop on the back panel. Simply
plug in your outboard effects unit into the parallel effects loop on the back panel, and adjust the level on RM4 front panel.
Front panel Master level: The master level is a master volume for all the preamps. adjust each preamp level to your desired level, than
adjust the master level for overall volume.
Density Control: This knob boosts the amount of overall low end in your guitar tone. A master low end control that should be set to your
desired liking.
Presence Control: This knob boosts the overall high end frequencies of your guitar tone. A master high end control which should be set
to your liking.
The Preamp Modules: At print of this manual there are 12 different preamp modules available. Please check our website or call for
information on new modules to date. See below for module features.
The Module Tone Controls:
Each module consists of 5 different controls with bright switch. Please read below for description of each.
Gain control- Adjusts the amount of desired distortion and gain. Each module has a different type and level of distortion.
Bass control - Adjusts the amount of desired bass frequency. To get started set each knob straight up.
Middle control- Adjusts the amount of mid-range frequency. Also set straight up to get started.
Treble control- Adjusts the amount of high frequency. Set straight up to get started.
Level control- Adjusts the amount of volume for each module. Set each module to a similar level, and adjust the master level to the
desired volume.
Bright switch- The bright switch adds additional high end presence to your tone. Each module has a different level of bright adjustment.
Turn the bright switch on or off depending on your desired tone.
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