Audified has released Audified U73b Compressor, a plug-in designed to be a faithful and unique emulation of an old German broadcast compressor/limiter unit U73b.
The modeled device was often used for mastering in European studios between 1960 and 1980. It is an all tube vary-mu compressor/limiter with adjustable release time option. Audified kept the circuit exactly as it was originally designed and only added an input and output gain before and right after compressor circuit to help with proper adjusting of the compression. The plugin effect has been also supplemented with a VU meter and selectable side-chaining.
Price: $149. There is a 30 days fully working trial version for Windows and Mac OS X.