Dunlop MXR M77 Directions For Use Download Page 2

SAMPLE SETTINGS

 

M77

 MODIFIED OVERDRIVE

DESCRIPTION
• Classic overdrive circuit hot-

rodded for added versatility

• Adds sustain and gain without 

coloring your guitar’s tone

• 100HZ knob allows a more 

focused EQ when cut or a  
beefier tone when boosted

• BUMP switch engages an  

alternate EQ voicing that  
boosts lows and mids

• True bypass

DIRECTIONS
• Run a cable from your guitar to 

the Modified O.D.’s INPUT jack 
and run another cable from the 
Modified O.D.’s OUTPUT jack  
to your amplifier.

• Set all controls to their  

12 o’clock position.

• Turn the effect on by  

depressing the footswitch.

• Rotate the GAIN knob clockwise 

to increase the amount of 
overdrive or counterclockwise  
to decrease it. 

SPECIFICATIONS 
Input Impedance 

1 MΩ 

Output Impedance 

<7.5 kΩ 

Noise Floor*  

>87 dB

Tone Control  

± 8 dB at 2.7 KHz

100HZ Control 

± 24 dB at 100 Hz

Bump Button   +6 dB low ~ mid boost  

     

-3 dB at 540 kHz

Gain Control 

± 25 dB range at 100 Hz

Bypass 

    True Hardwire

Power Draw 

<4 mA 

Power Supply 

9 volt DC 

 0 dBV = 1Vrms

*A Weighted, all controls at mid position.

• Rotate the OUTPUT knob 

clockwise to increase 
overall effect volume or 
counterclockwise to decrease it.

• Rotate the 100HZ knob clockwise 

to increase the low end for a 
thicker tone or counterclockwise 
for a more focused sound. At 12 
o’clock, the frequency is flat.

• Engage the BUMP switch for an 

alternate EQ voicing that provides 
a low and mid frequency boost.

NASHVILLE CAT

T-STYLE/ 1X12” REVERB 

COMBO/ CLEAN

RAWK GAWD

LP/ UK STACK/ ON 11

TEXAS GUNSLINGER

S-STYLE/ 4X10” REVERB 
COMBO/ PUSHED

CONTROLS

    TONE knob shapes overall EQ
    100HZ knob cuts/ boosts  

at 100 Hz

    BUMP switch boosts lows and 

mids (indicated by blue LED) 

    OUTPUT knob controls  

overall effect volume

    GAIN knob controls the amount 

of overdrive

6

  FOOTSWITCH toggles  

effect on/bypass (red LED  
indicates on) 

POWER
The MXR Custom Badass

 

Modified O.D. is powered by one 
9-volt battery (remove bottom plate 
to install), a 9-volt AC adapter such  
as the Dunlop ECB003/ECB003E,  
or a DC Brick

 power supply.

DUNLOP MANUFACTURING, INC.  

P.O. BOX 846 BENICIA, CA 94510 U.S.A. 

TEL: 1-707-745-2722  FAX: 1-707-745-2658  

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