Thanks to all for the help. The AC CAL 10K pot would only adjust out to a minimum of 1K. Replaced it, and all was well. 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"