
M173 CLASSIC 108 FUZZ
DESCRIPTION 
• BC108 Fuzz Face 
 a pedal-board friendly chassis
• Original Fuzz Face hammertone turquoise nish
• True bypass
®
 circuitry in  
CONTROLS
 VOLUME knob controls 
overall effect volume
 FUZZ knob controls 
amount of fuzz
 BUFFER switch removes 
high-end roll off and oscillation 
caused by some wah wahs 
 FOOTSWITCH toggles 
effect on/bypass  
(blue LED indicates on) 
POWER 
The MXR Classic 108 Fuzz is 
powered by one 9-volt battery 
(remove bottom plate to install), 
a 9-volt AC Adapter such as the 
Dunlop ECB003/ECB003EU or 
a power supply such as the DC 
™
.
Brick
DIRECTIONS
• Run a cable from your guitar to  
 the Classic 108 Fuzz’s INPUT  
 jack and run another cable from  
 its OUTPUT jack to your amplier.
• Start with all controls at 
12 o’clock.
• Turn the effect on by depressing  
the footswitch.
• Rotate the FUZZ knob clockwise 
to increase amount of fuzz or 
counterclockwise to decrease it.
• Rotate the VOLUME knob 
clockwise to increase 
overall effect volume or 
counterclockwise to decrease it.
• Engage the BUFFER switch to 
eliminate the oscillation that 
sometimes occurs when a wah 
wah is in front of the Classic 
108 Fuzz. You may notice a 
brightening of the fuzz tone.
SAMPLE SETTINGS 
BROWN ACID KINGS OF THE 
BLACK IRON
DESERT
SPECIFICATIONS 
Input Impedance 
 Buffer ON  800 kΩ 
 Buffer OFF  10 kΩ 
Output Impedance at 1 kHz 
 Max Volume  16 kΩ
  -6 db Volume  160 kΩ 
Max Output Level  -4 dBV 
Max Gain at 1 kHz  55 dB
Bypass    True Hardwire
Current Draw  2.2 mA 
Power Requirement  9 volts DC 
DUNLOP MANUFACTURING, INC. 
P.O. BOX 846 BENICIA, CA 94510 U.S.A. 
TEL: 1-707-745-2722 FAX: 1-707-745-2658