For more than 30 years, the Studer A800 Multichannel Tape Recorder and Ampex ATR-102 Mastering Tape Recorder have endured as the world’s most sought-after professional tape recording machines. As two sides of a legendary mixing/mastering coin, the fabled “Studer and Ampex” combination provides the ideal qualities of warmth, presence, cohesion, and low-end punch that only genuine tape can provide.
This is a great video showing how these plug-ins can change your mix. I use these two in my mixes.