Edge Boost

"Excellent FET boost without a belt clip"



The Edge Boost rack effect module compares to the Boss FA-1 FET Amplifier, a big, clean, tube-y boost favored by U2's Edge.



The Boss FA-1 FET Amplifier was a bit odd, being one of two Boss "pedals" released that were not really pedals at all - there is no stompswitch.  It was meant to be worn on the player's belt.  It was released during the 80's and quickly adopted by a certain guitar player in an Irish mega-rock band.  The Edge Boost provides a ton of clean boost that can easily push a tube amp into breakup.  Along with Vox AC30 amps and some good delays, a must-have for a U2 cover band.  Our version uses either vintage or updated components.  The vintage op amp is getting a little difficult to find, but can be replaced by better modern op amps if you prefer.



  • Edge Boost - Compares to Boss FA-1 FET Amplifier



Input buffer



  • Transistor - By default, we put in 2SK246GR like the original units.  Other FETs can be used if you prefer.
  • Op Amp - By default, we put in HA1457W like the original units.  That op amp has an unusual inline pinout, so we added a second op amp socket to the board so that any 4558-compatible op amp can be used.  NE5534 or TL072 might be good choices if you want to change things up a little bit.
  • Voltage - If you want more clean headroom, we can boost the voltage from the standard 9V to 12V or 15V, as long as any op amp you choose is compatible with the new voltage (should be)
  • Components - By default, we use metal film resistors and a selection of capacitors to provide good tone and low noise.


Front Panel

  • Volume
  • Bass
  • Treble
  • Flat / Lo Cut switch


Rear Panel

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


Module Width

  • 1.5"
  • 2" left wing and 1.5" right wing available


Power Consumption (aprox)

10 - 15mA


Base Configurations

Part # Description List Price
MOD-EDGE Edge Boost module $209



Part # Description List Price
MOPT-EDGE-TRANS Custom Transistors $0 - TBD
MOPT-EDGE-OPAMP Custom Op Amp $0 - TBD
MOPT-EDGE-VOLTS Choose 12V or 15V operation instead of 9V $0
MOPT-EDGE-CC Component Changes TBD



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