Does VTL Use Negative Feedback In Their Designs?

Been reading about some AA members success using Dakiom Feedback Stabilizers on some tube power amps such as Rogue,and Cayin and was wondering about trying them on my VTL ST 150.Can't find anything on VTLs website or in my man if VTL uses negative feedback in their designs.Can anyone tell me?
Yes, VTL uses small amounts of negative feedback in their amplifiers.