How to Wire-up a Power Amplifier

Here is a short pdf that shows you how to wire-up a power amplifer and get zero noise – i.e. no hum.  For new builders,  this is often one of the most frustrating aspects to get right.  This simple guide should get you going in the right direction.

How to wire-up a Power Amplifier_Updated [Autosaved]

For some practical examples of low noise amplifiers using these techniques, see the e-Amp, nx-Amplifier and sx-Amplifier on

The picture below shows the internal wiring of one of the two nx-Amplifiers I have built with zero noise or hum problems. The power wiring is tightly bundled, and small signal wiring is kept well away from the transformer and other power wiring. On the PSU PCB, strict attention to the capacitor ‘T’ connection and ‘star’ ground return result in an exceptionally quiet amplifer.