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2-channel Guitar Preamplifier

Pt.3: Building the preamps and reverb module into a metal rack case

By John Clarke

As shown in the photos, the completed pream-plifier boards and the reverberation module fit neatly into a 2-unit rack case. The 2-unit high case is required to allow room to mount the second channel above the first channel. However, if you intend to build a single-channel version only, it could be housed with the reverb unit in a 1-unit case.

Click for larger image
This is the view inside the completed prototype. The two preamplifier boards are stacked one above the other at top, while the reverberation unit is in the bottom righthand corner.

Before putting the case together, you have to first drill the front and rear panels. Use the wiring diagram (Fig.1) and the front panel artwork (Fig.2) as a guide to positioning the holes.

Starting with the front panel, you will have to drill holes for mains switch S1, the 10 potentiometers and the three 6.35mm jack sockets. The hole for switch S1 can be made by first drilling a series of small holes around the inside perimeter, then knocking out the centre piece and carefully filing to shape. Don’t make the hole too big – the mains switch must be a tight fit so that it is properly secured by its retaining tabs.

The rear panel requires holes for the fuseholder and mains lead cord-grip grommet at one end and the XLR panel plug and two 6.35mm jack sockets at the other end. Take care with the hole for the cordgrip grommet. This hole is not round – instead it must be carefully profiled to match the shape of the grommet, so that the grommet can not later be pulled out.

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