The 2B+ preamp is a boost-only version of Nordstrand's popular standard 2B preamp. 

• INFO
• LAYOUT
• TECH

• The 2B+ Boost Only Preamp offers the same carefully selected eq points and two way treble frequency dip switch, but goes above and beyond its fellow preamps in that it allows up to 15db boost for powerful tone shaping capabilities. This preamp offers a flexibility and practical simplicity that will boost highs and polish lows. It includes a dip switch for shifting the treble eq point, as well as an adjustable gain trim pot that enables you to increase the overall output.

• 2B+3A (1 Pickup - 2 Band -- 3 Knob):
  Volume w/Active-Passive Push-Pull -- Treble -- Bass
  
  2B+3B (2 Pickup - 2 Band -- 3 Knob):
  Volume w/Active-Passive Push-Pull -- Blend -- Treble/Bass Stack
  
  2B+4A (2 Pickup - 2 Band -- 4 Knob):
  Volume w/Active-Passive Push-Pull -- Volume -- Treble -- Bass
  
  2B+4B (2 Pickup - 2 Band -- 4 Knob):
  Volume w/Active-Passive Push-Pull -- Blend -- Treble -- Bass
  
  2B+4C (2 Pickup - 2 Band -- 4 Knob):
  Volume w/Active-Passive Push-Pull -- Blend -- Tone -- Treble/Bass Stack
  
  
• 2B+3A wiring diagram
  2B+3B wiring diagram
  2B+4A wiring diagram
  2B+4B wiring diagram
  2B+4C wiring diagram
  
  

  Overall gain is 0 to 15db by a trim pot on the circuit board.

  Bass +15db @ 50Hz

  Treble +15db @4khz

  Switchable Treble Response Curve

  Battery life is estimated to be around 250 hours for an alkaline 9v.