Go to http://www.harbachelectronics.com/main/page_products_sb200__sb201.html Last item on the list. Pete, wa2cwa On Wed, 13 Jun 2012 07:02:43 -0000 "Tom Johnson" <yardmaster2 at att.net> writes: > Does anyone know a source for a T/R relay for the SB 200 and the > correct > part number? Tnx N4TJ