Hello Heathkit Fans, If you have extender boards for the SB-303, I would be very interested in buying them. Tks, John Listserver Subscription:listserv at listserv.tempe.gov - "subscribe heath 'name' 'call'" Listserver Submissions: heath at listserv.tempe.gov Listserver Unsubscribe: listserv at listserv.tempe.gov - -"signoff heath"