Philipp Bulling has released a 64-bit version of Tube Preamp, a freeware amplifier VST plugin for Windows.

"The following work is the result of my bachelor thesis, titeled “Real-time implementation of a tube preamplifier in order to distort discrete audio signals” (original title in German: “Echtzeit-Implementierung einer Röhrenvorstufe zur Verzerrung diskreter Audiosignale”). I wrote the thesis in cooperation with d&b audiotechnik GmbH in summer 2012. The unauthorised use, reproduction, or passing on of individual content items or the complete page is not permitted."

Tube Preamp is free.

Visit: philaudio.wordpress.com/tube-preamp