Randall RM4 Manual
Contents
1. Randall AMPLIFIERS RM 4 MODULAR TUBE PREAMP 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 preamp 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 amplifi er 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 f2. to be used with the front panel mix control Effects loop tubes Each effects loop utilizes two 12AX7 tubes to buffer your processing gear Any outboard effects processing used through the effects loops go through the tubes to warm the sound of any signal processing Common Input tube Each module also utilizes one common input tube installed in the rear of the RM4 preamp Your guitar signal always passes through the input tube first before each module so each preamp modules uses three 12AX7 preamp tubes to help generate the pure tube tone Ground Lift Switch to eliminate grounding hums Reverses the polarity of the voltage to eliminate unwanted ground noise A CAUTION TO REDUCE THE RISK OF FIRE aa FOOTSWITCH OR ELECTRIC SHOCK DO NOT EXPOSE THIS EQUIPMENT TO RAIN OR MOISTURE IN THRU WARNING TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER REFER MODEL SERVICING TO QUALIFIED SERVICE PERSONNEL N AVIS RISQUE DE CHOC ELECTRIQUE SERIAL NE PAS OUVRIR A CAUTION TUBES ARE HOT GROUND OUT PARALLEL LOOP i SERIES LOOP an OUT gt POST LOOP RETURN SEND RETURN SEND PRE LOOP INPUT EPIA LS AR EA Sy i GM Ke Y Nes J I LL ji L L 50 60 Hz 210 WATTS oo a l aa oo l an lt lt ee N vt lt lt gt gt oo NA S oo ON NA UTILTSER UN FUSIBLE DE ECHANGE DE MEME TYPE 1 2 3 4 5 6 7 8 9 10 11 12 1 AC Power Voltage Selector The RM4 can oper
3. ate at AC currents of 100V 110V 120V 230V Simply remove the fuse with a small screwdriver and line up the correct voltage with the arrow and plug back in After selecting the correct voltage connect the AC power cord the wall socket 2 Power Switch This switch turns the unit on off 3 Ground Lift Push button to lift and eliminate unwanted ground hum 4 MIDI in Input for the RF4 foot controller or any external MIDI switching system 5 MIDI thru Connect the Thru output to the MIDI in of the RT2 50 power amp or any external MIDI effects processor 6 Post loop out Connects to input of power amplifier use when either effect loops is being used 7 Parallel loop return Connects to the output of any external effects processor which should be used with time base effects such as echo reverb delay etc Use the front effects knob mix control to mix in the desired amount of effect A specialized loop that retains the direct dry signal at all times It is imperative that the effects unit is programmed for 100 effects output 8 Parallel loop send Connects to the input of any external effects processor Use the front effects knob for desired level of effects 9 Series loop return Connects to the output of additional external effects processor Used for effects that require processing 100 of the signal such as compressors equalizers noise reduction etc 10 Series loop send Connects to the input of additional external effec
4. nput jack Connects directly to your instrument 2 Channel switch Push and release button to switch between channels 1 4 This button is also used to program when the footswitch is used Please read the footswitch programming section 3 Gain control Each preamp module has a gain control which can be adjust for the desired amount of gain and distortion Each module has different levels of gain 4 Bright switch Acts as a presence switch and adds in additional high frequency Each module has different level of bright adjustment 5 Bass control Controls the amount of low frequency for each module adjust to your desired level Each module has a different low end frequency response 6 Middle control Controls the amount of mid range frequency for each module adjust to the desired level Each module has a different mid range frequency response 7 Treble control Controls the amount of high frequency for each module adjust to the desired level Each module has a different high frequency response 8 Master level Each module has it own level control This adjusts the desired amount of volume for each module Please adjust each module to similar volume level than use the chassis master to adjust overall volume 9 Thumbscrews Each module has two thumbscrews that securely lock in each module To change modules simply loosen the two thumbscrews until they feel loose Carefully slide the module out using the thumbscrews to pull and slide in a new m
5. odule Press in the new module in using the control knobs until the module is flush with the front panel Push in the two thumbscrews and turn to tighten until tight 10 Effects control This knob is used when using the parallel effects loop on the rear panel Hook up your external effects processor in the parallel effects loop and control the amount of effects with this knob Turn to dry for no effects or wet for maximum effects You Rear panel features and controls Rear input The RM4 has both front and rear 1 4 inputs The rear input is commonly used with wireless systems that have rear outputs for a rack system Preoop output 1 4 signal output before the effects loops Used to connect to input of power amplifier or recording unit Use when the effects loops are not being used Post loop outputs Dual 1 4 outputs after the effects loops Used to connect to input of power amplifier or recording unit Use when the effects loop is being used MIDI in thru To be used with any MIDI controller and outboard switching system Connect your RF4 MIDI footswitch to the IN jack and connect the THRU jack to the MIDI IN of your RT2 50 power amplifier The MIDI thru jack can also be connected to the M Parallel effects loop Used to connect any outboard effect processors Use the parallel effects loop when you want to use the front panel mix control Series effects loop Also used to connect your outboard effect processors Not
6. on 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 RM4 front panel consists of 1 4 input channel switch effects level and Master level Read below for descriptions of each Channel switching Each module can be changed by either pressing the front panel button or the optional 4 button MIDI footswitch Simply press and release the front panel button to change modules When using the footswitch please program first To program plug in the footswitch and press button one Make sure the preamp has also switched to channel 1 if not press the front panel button until your at channel 1 Now that channel 1 on your footswitch and front panel are lit press and hold the front panel button for 3 seconds and release Your footswitch will not be programmed to you preamp so you can switch to any desired channel with your footswitch To reset please turn off the unit off than back on 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 l
7. ons BASS MIDDLE TREBLE MASTER O C e C C O Replacing modules W hen exchanging modules simply turn o 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 Randall 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 set tings 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 butt
8. oop 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 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 The 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 different levels 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 GAIN BASS MIDDLE TREBLE MASTER MIDDLE TREBLE MASTER BMA OO El BRIGHT a BRIGHT TOP BOOST CHANNEL TREBLE MASTER MIDDLE TREBLE MASTER BRIGHT 1 I
9. orce in handling control buttons switches and controls Do not use solvents to clean the unit wipe off the exterior with soft cloth EXCLAMATION POINT The exclamation point within an equalateral triangle is intended to alert GROUNDING To prevent electric shock DO IM PORTANT SAFEG UAR DS NOT DEFEAT THE 3 PRONG GROUNDING the user of the presence of IMPORTANT PLUG on product s power cord Do not use an THESE WARNINGS APPLY TO ALL RANDALL ELECTRONIC PRODUCTS PLEASE READ AND OBSERVE ALL OPERATING AND MAINTENANCE OR adapter extension cord or outlet unless the WARNINGS AND INSTRUCTIONS CONTAINED IN THIS SERVICE MANUAL AND THOSE ON YOUR RANDALL SERVICE INSTRUCTIONS in the literature blades can be fully inserted to prevent blade PRODUCT PRIOR TO ITS USE accompanying the product exposure WARNINGS AND SYMBOLS PRECAUTIONARY WARNING WARNING GRAPHIC ON PRODUCT WARNING GRAPHIC ON PRODUCT LIGHTNING FLASH The lightning flash with RAIN AND MOISTURE To reduce the risk of an arrowhead within an equalateral triangle is fire or electric shock DO NOT EXPOSE THIS WARNING intended to alert the user of the presence of UNIT TO RAIN OR MOISTURE Operators of RISK OF ELECTRIC SHOCK CAUTION o ee uninsulated DANGEROUS VOLTAGE within electronic products should in no way be in the product s enclosure that may be of contact with water ATTENTION significant magnitude to constitute risk of RISQUE DE CHOC ELECTRIQUE NE PAS OUVRIR electric shock to pers
10. ts processor 11 Pre loop out Connects to input of power amplifier Use when the effects loops are not being used 12 Rear panel input Additional input to the front panel input Commonly used with rack systems and wireless units
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