Coming soon: Hifisonix ax-Amplifier

Part 1 of the ax-Amplifier will be published in the March issue of audioXpress, with Part 2 to follow in April. Stay tuned for further updates.

Read more →

Spin 2 of the nx2-Amplifier PCB . . .

In the last update on Feb 1st, I had just received the PCB back from the PCB house. Since this was my first design on KiCAD, I wasn’t expecting much, so it was as much a learning exercise as it was a first PCB spin. Well, half the silk screen was missing, some of the […]

Read more →

Ground Loops

Updated with new material 7th January 2019 This set of c. 70 slides is the culmination of my experience over a period of about 25 years building numerous power amplifiers and preamplifiers. I first started out in audio around 1975 or 76 a teenager. Some of my creations were reasonably quiet – through pure luck […]

Read more →

How to wire-up a Dual Mono Bloc Amplifier

A few people have asked about wiring up a dual mono amp aka dual mono bloc. In a dual mono bloc there are separate power supplies and lots of opportunity for cross channel ground loops and ordinary ‘classic’ ground loops as well. This wiring scheme addresses the situation were unbalanced connections between the source equipment […]

Read more →

Amplifier History: The JBL SA-600

The beautifully styled JBL SA-600 amplifier was launched by the James B. Lansing company in 1966, and Bart Locanthi (the designer) wrote the  technical article linked to at the bottom of this write-up in January 1967. I’ve included this in the hifisonix power amplifier library because it is one of the earliest – if not […]

Read more →

CFA vs. VFA: A Short Primer For the Uninitiated

This article was written in 2014 in response to what can only be described as a vitriolic debate as to what constituted a CFA on diyAudio.com.  At the time, many of the participants were struggling to grasp the fundamental differences between VFA’s and CFA’s, and even how to tell them apart.  So, this document is […]

Read more →