Mastering outboard:

Neumann mastering console with PEV Eq
If you mastered anything between 1970-1980 it would have most likely gone through this.

Studer C37 2trk mastering
Same machine Sgt Peppers was mastered on.

Ampex 350 2trk 1\2" mastering
A beefed up version, every rock and roll record was made with.

Revox B77 mastering
Great playback tweak the speed for that brighter single.

Digital multitracking and mastering:

Pro Tools HD 24 96 I\O
The ONLY choice