JCA - 2BPA

Bass Preamp Project
This project is to convert a Watch Guard Firebox II 1000 from a dedicated firewall, to a Rack mount Bass Preamp.
Trust me, this is a better using of it
Finnished: 4/10/06
Design:
  • Two channel svt style preamp.
  • two channel output or mono output.
  • must still be rack mountable
    • Schematic: Version 1
    Status: (things still needed to be done, ok everything!)
  • Pretty much done, just have to hook it up and pray that it works

  • front over view look

  • FireBox straight on

  • The inside of the chassis completely gutted, overhead look

  • back view into gutted firebox (does this volid the warranty

  • Aluminum plate cut to mount turret board and tube bracket to, mounts to motherboard standoffs

  • Power transformer mounted to part of the old case powersupply.

  • Tube mount bracket

  • Tube mount bracket bent

  • Mounting plate ready for bracket

  • Tube bracket mounted to plate

  • Side view

  • Tube socket mounted in bracket

  • Front view of bracket

  • Side back view of bracket

  • Plate mounted in chassis

  • Turret board

  • Mounting plate with studs for the turret board

  • Turret board on the mounting plate

  • Back of the chassis with new face plate, rough cut

  • Circuit board stuffed except the 220k resistors

  • circuit board mounted in chassis

  • high voltage and ground wires ran.

  • Jacks with grounding wire and resistors setup.

  • Back view of jacks.

  • Back view of controls.

  • front view towards power supply board (the 5.k was replaced with 1.5k resistor).

  • Overhead view of PS board.

  • view of chassis with all power lines ran.

  • Front view with controls wired in and cut out for the controls to recess in..

  • Finnished front view.

  • Finnish back view.
    • copyrighted 2006 by Bryan James