In the broadcast business there is a standing joke that has a lot of truth to it..."Never buy a transmitter with a tube that begins with a Y".....The main reason is the Eimac YC-130 (a souped up 4CX15000A)....it is used the Continental 816R5 35kw FM transmitter and has been plagued with short life, catastrophic failure, etc. Charlie Wooten NF4A Clear Channel Radio