Original poster: FutureT-at-aol-dot-com In a message dated 2/24/04 10:03:30 AM Eastern Standard Time, tesla-at-pupman-dot-com writes: >Is this not the reason for the feedback winding on VTTC coils to adjust the >Fres of the primary circuit as the streamers grow and affect the Fres of the >secondary? Ian, The feedback coil on VTTC coils keeps the oscillations going. John