On 10/4/2017 7:36 AM, Jim Thomson wrote: > What is the life expectancy of a gigavac, or kilovac or jennings > vac relay, when used in QSK mode ?? I heard it was something like > 10-12 years, with main focus on CW qsk contesting. That's not the experience of contesters. The issue is the number of operations. 73, Jim K9YC