Fredenstein F601A

Fredenstein F601A is a pre-amp for the 500 series, manufactured by Fredenstein.

History
The Fredenstein F601A appears to have been released in 2013 or 2014. It is a revised version of the Fredenstein F601.

Official description
The F601A is a high performance professional microphone preamplifier. Its innovative Zero-Negative-Feedback design improves low frequency and transient reproduction dramatically.

In addition, the F601A delivers detailed high frequency information without being harsh, a truly silky and smooth experience. It's fully discrete Class-A gain stage with its high performance Lundahl LL1578XL input transformer outperforms “classic” microphone preamplifiers by a wide margin.

This combined with the F601A's very low noise will provide exceptional sonic results.