Myelination and time constant
No. When a signal is sent through a myelinated axon, the Nodes of Ranvier act as repeaters in electronics. The signal/action potential will disperse down the axon, the Node of Ranvier will pick up the signal, amplify it, and send it to the subsequent Node of Ranvier. I think you're thinking of the Nodes of Ranvier as cracks in the myelin/axon rather than as mini re-amplification sites.