Original poster: "CJ Moore by way of Terry Fritz <twftesla-at-qwest-dot-net>" <wizard1234-at-home-dot-com> Is there any general consensus on which brand of NST lasts longer or works better> Is there a a certain type which has been classified as the best to use, ie: 15 kv lasts longer or works better in TC operations than 12 kv. CJ Moore 60871583