IC Pi

"Big, thick, op amp Big Muff Pi fuzz"

 

 

The IC Pi fuzz rack effect module compares to the EHX Big Muff Pi, v4 and v5, the "op amp" versions with or without the Tone Bypass.  Big Siamese Dreams fuzz tones.

 

Description

One version of the EHX Big Muff Pi was completely unlike all the other versions, sharing only a name and enclosure style with other vintage Big Muff Pi versions.  That version used op amps instead of transistors to produce its massive fuzz.  The Smashing Pumpkins' Billy Corgan used the op amp Big Muff Pi on Siamese Dreams.  There were a couple different versions of the op amp Big Muff.  The only significant difference between them was the addition of a Tone Bypass.

 

Configurations

  • IC Pi - compares to EHX Big Muff Pi op amp version

 

Buffers

None

 

Options

  • Tone Bypass - This option adds the Tone Bypass switch.  Some originals included a small change to get rid of the volume boost that comes when you turn on the Tone Bypass in earlier units.  We include this by default so that the normal and tone bypass volume are closer to the same.  If you don't want that fix, just let us know.
  • Custom Op Amp - The LM741 is used by default, just like the original.  You can choose a different pin-compatible op amp if you like.
  • Custom Clipping Diodes - The default clipping configuration is (6) 1N914 diodes, like the original circuit.  You can choose a different config if you wish.  This is not presently available with a switch.
  • Components - We use metal film resistors and a selection of capacitors that provide good tone and low noise. 

 

Front Panel

  • Volume
  • Tone
  • Sustain
  • (optional) Tone Bypass switch

 

Rear Panel

  • Audio In
  • Audio Out
  • On/Off Footswitch
  • On/Off Override
  • DC Power
  • DC Power LED

 

Module Width

  • 1.5" standard
  • 2" left wing module and 1.5" right wing modules are available for 3-4 control configurations

 

Power Consumption (aprox)

12 - 15mA

 

Base Configurations

Part # Description List Price
MOD-ICPI IC Pi module $199

 

Options

Part # Description List Price
MOPT-ICPI-BYPASS Tone Bypass Switch $19
MOPT-ICPI-OPAMP Custom Op Amp $0 - TBD
MOPT-ICPI-CLIP Custom Clipping $0 - TBD
MOPT-ICPI-CC Custom Components $0 - TBD

 

Parts

Part # Description List Price
MPT-ICPI-CA Replacement pot, switch, jack, LED cable assembly $19
MPT-ICPI-KNB Replacement control knob $2
MPT-ICPI-PB Replacement power board $29
MPT-ICPI-SB Replacement switching board $29