>Rich- >What does "worst case" mean? >Thanks, >-bob > Go for max V on the 'scope. However, an antenna tuner arc can reflect back to the tank and arc it. > With the 8169 amp on my Web site, an arc in the 160m tuner outside would cause a 3cm arc the tank L. - R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K, www.vcnet.com/measures. end