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