Randall RM100 Guide

RM100

Modular 100 Watt Tube Head

Install the modules (up to 3) by firmly inserting the module by the center front panel
knobs into the slot. Make sure the module front panel is flush with the chassis, then
tighten the two captive thumbscrews until the module panel is pulled in flush with the
rack panel. Always install a blank “filler” panel into any unused module slots. To remove
a module, turn the two thumbscrews counter clockwise until they are loose. Grasp the
thumbscrews and pull out.

FRONT PANEL:

INPUT: Plug your guitar in here. This jack takes priority over the rear

panel input.

CHANNEL: Selects the desired module, and also stores program changes by

pressing and releasing.
EFFECTS: Adjusts the effects level for the PARALLEL LOOP.
MASTER: The overall output level for all channels.

REAR PANEL:

SERIES LOOP: Used for effects that require processing 100% of the signal such

as compressors, equalizers, noise reduction, etc.
PARALLEL LOOP: A specialized loop that retains the direct (dry) signal at all times.

Akin to the effects buss on a PA or recording mixer. Your direct

tone is unaffected and the desired level of effects is controlled by

the front panel EFFECTS knob. It is imperative that the effects unit

is programmed for 100% effects (wet) when using this loop. This

loop should be used for time base effects such as echo, reverb,

delay etc.

MIDI IN:: For channel selection. Used as the input for the RANDALL (RF3)

3-button foot controller, or other midi controllers.
THRU: Passes the signal from the IN jack for controlling other external

MIDI devices. Connect to the MIDI IN of other external MIDI

devices.
AC INLET: Accepts a standard IEC power cord. Remove the fuse holder and

insert so that the arrow points to the correct voltage. Be sure to

install the proper value fuse as indicated on the rear panel.

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CHANNEL SWITCHING:

If there are 3 preamps(RM100) or 4 preamps(RM4) installed; pressing & releasing the
Channel Select switch within half-a-second will change the channel from 1 to 2, pressing
& releasing again 2 to 3, and again 3 to 4, and once again 4 to 1.

SAVING A PRESET:

Pressing and holding the channel select switch for 1 second will store the current setting.

MIDI CHANNEL SELECTION:

The MIDI Channel (1 - 16) is selected via an internal four position DIP switch (S1). The
MIDI Channel must be selected with the power off.

CHAN. S1-4 S1-3 S1-2 S1-1
1

on on on on

2 on on on off
3 on on off on
4 on on off off
5 on off on on
6 on off on off
7 on off off on
8 on off off off
9 off on on on
10 off on on off
11 off on off on
12 off on off off
13 off off on on
14 off off on off
15 off off off on
16 off off off off

MIDI (RECEPTION) IMPLEMENTATION:

The EMB board recognizes Program Changes or (NOT both) Control Changes on a pre­selected MIDI Channel, see above for “MIDI Channel Selection”.

Program Changes 1 to 128 select EMB presets 1 to 128, which are saved in EEPROM
memory.

Control Change #56 (w/Control Value 127) allows for “Instant Access” selection of Channel 1.

Control Change #57 (w/Control Value 127) allows for “Instant Access” selection of Channel 2.
Control Change #58 (w/Control Value 127) allows for “Instant Access” selection of Channel 3.
Control Change #59 (w/Control Value 127) allows for “Instant Access” selection of Channel 4.