Audix 35102/35302 Project

Many months ago I was asked to rack some Audix 35102 modules. These are close to being entirely discrete (one chip in the preamp section) with an inductor based EQ and a class A/B output stage. I don't know the entire history of Audix, but these are apparently some sort of spin-off from Neve.

I quickly found out that many people who had these were having issues with distortion when trying to drive a line level. After some digging around, it was obvious that these babies were never meant to drive a line level. Thinking back to the original design you'll see these were actually part of a large format console. Another module, the Audix 35302, presented the Audix 35102 with a high impedence load and it was used to drive the necessary line level. So, instead of trying to find many Audix 35302 modules, which would be expensive and take up valuable rack space, I found the schematic for the Audix 35302 and designed a small PCB to do that very task... which I called the 35302 Line Amp.

So with the Audix 35102 modules, the 35302 Line Amp, and a pair of Sowter 4127 output transformers, I got to work... here are my results.

I have six racks like this in total to build. These modules sound great and I hope to keep a pair for myself.