PettyJohn Predrive, User Manual

6   |   P R E D R I V E   U S E R   M A N U A L 

P E T T Y J O H N E L E C T R O N I C S . C O M

K N O B   &   S W I T C H   I D E N T I F I C A T I O N

INPUT VOLUME: 

This knob adjusts the preamp gain structure. At 

minimum this stage is a buffer as you increase the 

gain the tonal characteristics will change as well. Most 

people hear greater articulation, note separation, 

harmonic detail and at higher settings even a smooth, 
natural compression effect.

DRIVE MIX KNOB:

Active in drive mode, this knob mixes in clean signal with 

the overdriven tone. With this knob at max the PreDrive is 

a full on low gain overdrive pedal. Mix cleans back in a a 
dynamic,harmonically rich tone.

OUTPUT VOLUME: 

This knob backs off the output volume as needed.

HARMONIC DRIVE ON/OFF: 

The up position is clean mode, switching down 

engages drive mode.

BOOST GAIN: 

This stage has a gain of 1 to 11dB and also exhibits some 

sweet mojo at high settings.

BOOST ON/BYPASS SWITCH: 

Engages or bypasses the boost mode, controlled by the 

big boost knob.

PREAMP ON/BYPASS: 

Engage the preamp stage or utilize the true 
hard-wired bypass.