rockyboy,
The tube rectification and super clocks are add-ons. When I first purchased the Lampizator I only ordered the tube rectification (based on Fred's recommendation). Fred also recommended the super clocks but at the time I was not able to afford them. I recently just had the super clocks installed and I am glad I did. The Amber II is very musical which is my number one objective with components. In regards to jitter I believe that is the goal of the clocks...