Twelve years since first writing about the Syncron AU7a , I can finally offer a neat phantom power conversion. I converted a few of these in...

The Syncron Corporation are generally credited with launching the first transistorised capacitor microphone back in 1964 - the AU-7a, whic...

Many thanks to Dan Zellman, a former Syncron employee, who sent in this schematic for the AU7A condenser microphone. This was the 'l...

A while back I wrote about the Syncron AU7a FET condenser microphones , which are sometimes badged as the Fairchild F22. In that post I...

Last time I wrote about a pair of Syncron AU7A microphones. The capsules were in good condition, but the batteries had leaked, causing corro...

I was lucky enough to come across a pair of Syncron AU7A microphones (aka Fairchild F/22) on ebay. On arrival from the US I found that a...