Here is what I use to key my 8877 amp with the XV50 http://www.w6pql.com/relay_sequencer.htm Ed K7WIA -- View this message in context: http://elecraft.365791.n2.nabble.com/K2-XV50-interfacing-to-power-amplifier-tp7186174p7186499.html Sent from the Elecraft mailing list archive at Nabble.com.