Audified U73b Compressor is a faithful and unique emulation of an old German TAB broadcast compressor/limiter made for Telefunken. The original U73b was often used for mastering between 1960 and 1980. It’s an all-tube vari-mu compressor/limiter with adjustable release time. Audified kept the circuit exactly as it was originally designed, only adding in/out gain before and after the compressor circuit to help dial in the right amount of compression. The plug-in’s UI gains a VU meter and easily selectable side-chaining. U73b Compressor is available now for $149. It requires OS X 10.7 or later, an Intel Core processor or better, and a DAW that supports AU, VST or AAX plug-ins. RTAS legacy support seems to be available by special request.

http://shop.audified.com/collections/for-studios/products/u73b-compressor